ACCURATE ELECTRONICS 104001C Manuale utente

Page 1 of 10

Model 104001C

January 2014

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Prac_104001C0_RevB.pdf

Contents:

Section 1. General 1

Section 2. Application 2

Section 3. Installation 4

Section 4. Circuit Description 7

Section 5. Mechanical Outline 7

Section 6. Specifications 7

Section 7. Testing and Troubleshooting 8

Section 8. Maintenance 8

Section 9. Warranty 8

Figure 1. Circuit Description 9

Figure 2. Mechanical Outline 10

Figure 3. Typical Off-Premise-Station (OPS)

Circuit Using 104001C Line Amplifiers 2

Figure 4. Module Arrangement for Two

4Wire 6Way Resistive Bridges in an

Accurate 246 Mounting Assembly 2

Figure 5. Typical 4Wire DX Signaling

Application Using 104001C

Line Amplifiers 2

Figure 6. 4000C 1 Option Switch and

Strap Locations 4

Table 1. Typical Transmit and Receive

Equalization Frequency Response 3

Table 2. Terminating Impedance Selection

Guidelines 3

Table 3. Externals Connections to 104001C 4

Table 4. Equalized Gain Settings From

Cable Loss Data 7

Table 5. Test Guide Checklist 9

1. GENERAL

1.01 This practice provides application, specification, circuit and mechanical

description, maintenance, installation, and warranty information relating to

Accurate Electronics’ Prescription Line Amplifier, Model 104001C.

1.02 The 104001C Prescription Line Amplifier module ( Figure 1) provides

active prescription level control, active prescription amplitude equalization,

and impedance matching for the transmit and receive channels of a 4wire

voice-frequency transmission facility. The 104001C also contains two

independent sealing-current sources, one on the facility side and the other on

the terminal side of the module.

Note: Because the 104001C has identical equalizers in both cannels,

identical impedance-matching capabilities at all four ports, and identical

sealing-current sources on the facility and terminal sides, it can be used

either at an intermediate point or near an end point of a 4wire facility.

Although the terms “facility side” and “terminal side” do not strictly apply

in intermediate applications, these terms will for convenience, be used

throughout this practice as follows: Facility side will refer to the receive-

input, transmit-output side of the 104001C, and Terminal side will refer to

the transmit-input, receive-output side as shown in Figure 1. of this practice.

1.03 This practice section is reissued to cover the Issue 4 version of the

104001C module (Accurate Electronic part number 104001C). The Issue 4

Module is identical to its Issue 3 predecessor except for the addition of a

front-panel power-on indicator LED.

1.04 The 4001C’s transmit and receive amplifiers can be independently

prescription-set to provide from 0 to 24dB of loss or 0 to 24dB of gain in

their respective channels. For each channel, gain or loss is selected via a

front-panel slide switch. The desired amount of gain or loss is then

introduced into each channel in precise 0.1dB increments via a front-panel

DIP switch. The maximum output level of each channel is +10dBm, with

distortion at maximum output less than 1 percent.

1.05 All four ports of the 104001C module can be switch-optioned for

balanced 1200, 600, or 150-ohm terminating impedance. The impedance of

the two facility-side ports is selected independently from that of the two

terminal-side ports. The transformers at all four ports of the module are

center-tapped to derive balanced simplex leads.

1.06 In addition to active prescription level-control circuitry, the 104001C

contains active prescription slope-type amplitude-equalization circuitry in

both channels. The transmit and receive equalizers are identical, each

providing from 0 to 7.5dB of gain at 2804Hz (re 1004Hz). Equalization is

introduced into each channel independently, in 0.5dB increments, via DIP

switches on the module’s front panel.

1.07 The 104001C can be optioned to provide 25mA of internally generated

sealing current to metallic facilities on the facility and terminal sides of the

module, to accept externally generated sealing current from the far ends of

the facilities on both sides of the module, to derive normal simplex leads on

both sides of the module, or to provide bypassed (straight-through) simplex-

lead signaling via a path separate from the transmit and receive transmission

paths. Each of the 104001C’s two internal sealing-current sources has a

“ZAP” feature by which a greater amount of sealing current is provided for a

few seconds when power is initially applied to the module.

1.08 The front panel of the 104001C is designed so that all level and

equalization adjustments can be made while the module is mounted in place.

Six front-panel bantam-type test jacks facilitate alignment and maintenance.

Both bridging and opening jacks are provided at the facility-side ports;

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Practice Section 10model Rev B

PRESCRIPTION LINE AMPLIFIER

MODEL 104001C

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opening jacks alone are provided at the terminal side ports. Front-panel

“SEAL CURR 1” and “SEAL CURR 2” LED’s light when the module’s

internal facility-side and terminal-side sealing-current options, respectively,

are activated and sealing current is flowing. Also located on the front-panel

is a “PWR ON” LED that lights when power is applied to the module.

1.09 An internally regulated power supply permits the module to operate on

filtered, ground-referenced –22 to –56VDC input. If the internal sealing

current optioned is selected, input power must be from –42 to –56VDC.

Maximum current requirements (at –48VDC inputs) are as follows:

With both sealing-current sources inactive, 30mA at idle and

65mA at maximum transmit and receive output levels.

With one sealing-current source active, 57mA at idle and 92mA

at maximum output levels.

With both sealing-current sources active, 84mA at idle and

132mA at maximum output levels.

1.10 Surge protection isprovided for the input and output of the transmit and

receive amplifiers. Reverse-battery protection and transient limiting are

provided for the module’s internal power-supply circuitry.

1.11 A Type-10 module, the 104001C mounts in one-position of an Accurate

Electronic Type-10 Mounting Shelf, versions of which are available for

relay-rack or apparatus-case installation. In relay-rack applications, up to 12

modules can be mounted across a 19-inch rack, while up to 14 modules can

be mounted across a 23-inch rack. The 104001C can also be used in the

Accurate 246 Resistive Data Bridge System, in which case the module

mounts in one position of the Accurate 246 Mounting Assembly. The 246

Assembly, basically a prewired Type-10 Shelf equipped with a connectorized

printed-circuit back-plane, houses up to 12 modules and mounts in a 19-inch

relay rack. The 246 Assembly and all rack-configured Type-10 Shelves each

occupy 6 inches of vertical rack space.

2. APPLICATION

2.01 The 104001C Prescription Line Amplifier with sealing current is

designed for use on 4wire voice-frequency transmission facilities, where it

provides active prescription level control, active prescription amplitude

equalization, and impedance matching in both the transmit and receive

channels. The module also contributes longitudinal isolation and surge

protection for the facility. In itself, the 104001C module is equivalent to a

4wire-to-4wire (44V4) voice-frequency repeater. When used with an

Accurate 420X Terminating Set (or equivalent), a 2wire-to-4wire (24V4)

repeater results.

2.02 Because equalization is available in both channels (instead of in the

receive channel only), the 104001C can be used not only as a terminal

repeater but also as an intermediate repeater. Figure 3 shows a typical off-

premises-station (OPS) circuit in which the 104001C is used in a variety of

applications.

2.03 The 104001C can also be used in the Accurate 246 Resistive Data

Bridge System, where each module provides an active interface between an

external 4wire facility and the passive fixed-loss data bridge. Figure 4 shows

a typical configuration for two 4wire 6way fixed-loss data bridges.

Level Control

2.04 Prescription level-control circuitry allows from 0 to 24dB of gain or

loss to be introduced into each channel of the 104001C independently. For

each channel, either flat gain or flat loss is selected via a front-panel slide

FIGURE 5. Typical 4Wire DX Signaling Application Using 104001C Line Amplifiers.

FIGURE 4. Module Arrangement for two (2) 4Wire 6Way Resistive

Bridges in a n Accurate 246 Mounting Assembly.

FIGURE 3. Typical Off-Premises-Station (OPS) Circuit using 104001C Line Amplifiers.

ACCURATE ELECTRONICS INC Practice Section 104001C Rev B January 2014

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switch. The precise amount of gain or loss required in the channel is then

selected in 0.1dB increments, via an eight-position front-panel DIP switch.

Amplitude Equalization

2.05 The 104001C’s active slope-type amplitude equalizers allow from 0 to

7.5dB of prescription-set gain at 2804Hz (re 1004Hz) to be introduced into

the module’s receive and transmit channels individually. Adjustable in 0.5dB

increments via front-panel DIP switches, this type of equalization is ideal for

nonloaded cable and can also be used effectively in many loaded-cable

applications to compensate for the frequency-response characteristics of

metallic facilities interfacing the module. The equalized gain response of

each module is not affected by flat gain or loss adjustments, which are used

to provide precise transmission alignment. The frequency response of the

equalizers is shown in tabular format in Table 1.

Note: Because introduction of equalization into either channel of the

104001C does not affect 1004Hz levels, equalization can be introduced not

only before but after transmission levels are set.

2.06 Whether one or both channels’ equalizers are used depends upon the

104001C’s position in the circuit. Use of the module as an amplifier at an

intermediate point in a 4wire circuit, for example, often requires the use of

the transmit equalizer as well as the receive equalizer. In any case, equalizing

at the receive end of a circuit (post-equalization) is generally preferable to

equalizing at the transmit end (pre-equalization). Pre-equalization tends to

amplify high-frequency signals to a level that is conducive to crosstalk. Post-

equalization not only eliminates this problem but also expedites the

equalization process because the circuit is easier to equalize at the receive

end. In some applications, however, pre-equalization may be necessary

because post-equalization at the receive end is unavailable.

Impedance Matching

2.07 Impedance-matching transformers at all four ports of the 104001C can

be switch-optioned for balanced 1200, 600, or 150-ohm terminating

impedance. A single option switch selects the desired impedance for both

facility-side ports (receive input and transmit output); a second option switch

performs this function for both terminal-side ports (receive output and

transmit input). Thus, on both the facility and terminal sides, the 104001C

can interface a variety of facilities and equipment, as listed in Table 2. The

150-ohm options provide a small amount of slope equalization for long

sections of non-loaded cable through the deliberate impedance mismatch.

TABLE 2. Terminating Impedance Selection Guidelines.

Impedance

Facility or Equipment Guidelines

1200 ohms

Loaded Cable

600 ohms

Non-loaded cable, carrier, SF and DX signaling

units, terminating sets, station apparatus.

Sealing Current and Simplex Leads

2.08 The 104001C contains two separate and independent 25mA sealing-

current sources, one on the facility side and one on the terminal side of the

module. In addition, all four impedance-matching transformers on the

104001C are center-tapped to derive balanced simplex (SX) leads. Option

switches on the facility and terminal sides of the module afford a choice of

four sealing-current and simplex-lead options, as follows:

2.09 When the 104001C’s internal sealing-current option on the facility side

is selected, 25mA of sealing current flows from the transmit output port (pins

41 and 47) and returns via the receive input port (pins 7 and 13). When the

4001C’s internal sealing-current option on the terminal side is selected,

25mA of sealing current flows from the transmit input port (pins 55 and 49)

and returns via the receive output port (pins 5 and 15). Both sealing-current

sources have a ZAP feature that provides a greater amount of current for a

few seconds when power is initially applied to the module. Each of the two

front-panel “SEAL CURR” LEDs lights when its respective source is active

and current is flowing.

2.10 A second sealing-current/simplex-lead option available independently

on the facility and terminal sides of the 104001C excludes the module’s

sealing-current sources from the circuit and provides return paths for sealing

current applied at the distant end of the facilities.

2.11 A third option is the derivation of normal simplex leads on either or

both sides of the module. This allows the 104001C to be used on circuits

TABLE 1. Typical Transmit and Receive Equalization Frequency Response

Receive

Equalizer

Switch

Setting

(dB)

Equalized Gain (dB) Introduced at Various Frequencies

300Hz

400Hz

500Hz

800Hz

1004Hz

1500Hz

1800Hz

2500Hz

2804Hz

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

6.5

7.0

7.5

0.0

-0.23

-0.52

-0.75

-1.00

-1.22

-1.50

-1.71

-2.02

-2.25

-2.49

-2.68

-2.89

-3.07

-3.29

-3.45

0.0

-0.19

-0.42

-0.60

-0.80

-0.98

-1.20

-1.37

-1.63

-1.79

-1.98

-2.14

-2.30

-2.44

-2.61

-2.74

0.0

-0.15

-0.33

-0.49

-0.64

-0.78

-0.95

-1.09

-1.29

-1.42

-1.57

-1.69

-1.81

-1.93

-2.05

-2.15

0.0

-0.06

-0.13

-0.18

-0.24

-0.29

-0.36

-0.41

-0.49

-0.53

-0.59

-0.63

-0.68

-0.72

-0.76

-0.78

0.0

+0.15

+0.32

+0.46

+0.61

+0.75

+0.90

+1.03

+1.22

+1.33

+1.47

+1.58

+1.69

+1.79

+1.89

+1.98

0.0

+0.43

+0.93

+1.33

+1.76

+2.15

+2.60

+2.97

+3.54

+3.90

+4.32

+4.67

+5.05

+5.38

+5.76

+6.06

0.0

+0.43

+0.93

+1.33

+1.76

+2.15

+2.60

+2.97

+3.54

+3.90

+4.32

+4.67

+5.05

+5.38

+5.76

+6.06

0.0

+0.50

+1.07

+1.54

+2.04

+2.49

+3.01

+3.45

+4.12

+4.56

+5.08

+5.51

+5.99

+6.41

+6.90

+7.30

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employing DX, loop back or other dc signaling schemes (see Figure 4).

Normal simplex leads can also be used to apply sealing current to a metallic

facility from a local source external to the module.

2.12 The fourth sealing-current/simplex-lead option is bypassed simplex-

lead signaling. This option provides a straight-through simplex-lead

signaling path between the module’s facility and terminal sides that is

completely separate from the modules’transmit and receive transmission

paths. A switch option available when bypassed simplex-lead signaling is

selected provides either a normal straight-through signaling path (RCV IN

SX to RCV OUT SX and XMT IN SX to XMT OUT SX) or a reversed

straight-through signaling path (RCV IN SX to XMT IN SX and RCV OUT

SX to XMT OUT SX). The reversed signaling-path option is used to

compensate for polarity reversals in duplex- (DX-) signaling and ground-start

application.

3. INSTALLATION

Inspection

3.01 The 104001C Prescription Line Amplifier module should be visually

inspected upon arrival to find possible damage incurred during shipment. If

damage is noted, a claim should immediately be filed with the carrier. If

stored, the module should be visually inspected again prior to installation.

Mounting

3.02 The 104001C module mounts in one position of an Accurate Type-10

Mounting Shelf, which is available in configurations for relay-rack and

apparatus-case installation, or in one position of an Accurate 246 Resistive

Data Bridge Mounting Assembly. The module plugs physically and

electrically into a 56-pin connector at the rear of its shelf or assembly

position.

Installer Connections

3.03 Before making any connections to the mounting shelf or assembly,

ensure that power is off and modules are removed. Modules should be put

into place only after they are properly optioned and after wiring is completed.

When installing 104001C modules in 246 Assemblies, refer to the Accurate

practice on the 246 Resistive Data Bridge System for cabling instructions and

module pinout assignments.

3.04 Table 3 lists external connections to the 104001C module. All

connections are made via wire wrapping to the 56-pin connector at the rear

of the module’s mounting shelf position. Pin numbers are found on the body

of the connector.

TABLE 3. External Connections to 104001C.

CONNECT

To PIN

XMT OUT TIP

XMT OUT RING

XMT OUT SIMPLEX

43 and 45

RCV IN TIP

RCV IN RING

RCV IN SIMPLEX

9 and 11

XMT IN TIP

XMT IN RING

XMT IN SIMPLEX

51 and 53

RCV OUT TIP

RCV OUT RING

RCV OUT SIMPLEX

1 and 3

-BATT (FILTERED -22 TO -56

VDC IN)

Strap Options

3.05 As shipped from Accurate, connector pin 43 is the 104001C’s XMT

OUT SX lead and connector pin 3 is the RCV OUT SX lead. If an additional

(or alternative) connector-pin appearance for the XMT OUT SX lead is

desired on pin 45, install option strap JP9 where indicated on the module’s

printed circuit board, as shown in Figure 6. If an additional (or alternative)

connector-pin appearance for the RCV OUT SX lead is desired on pin 1,

install option strap JP10 where indicated on the module’s printed circuit

board (also shown in Figure 6). Before installing JP9 or JP10, be sure to

observe the caution below.

Switch Options

3.06 Five option switches must be set before the 104001C can be placed into

service. Locations of these switches on the module’s printed circuit board

are shown in Figure 6, and instructions for setting the switches are given in

paragraphs 3.07 and 3.08.

CAUTION: Extreme care must be taken when soldering on printed circuit

boards to prevent damage to the delicate foil. Use a soldering iron with a

tip temperature of 800 degrees or less. Use only 60/40 or 63/37 tin / lead

rosin-core solder. Do not hold the tip of a hot iron on a soldering

connection for longer than two (2) seconds.

Note: All switches on the front panel of the 104001C are used for

alignment and are covered in paragraph 3.09 through 3.014.

Terminating Impedances

3.07 Switch S1 selects the terminating impedances at the 104001C’s facility-

side ports (rcv in and xmt out). Switch S3 performs the same function for the

4001’s terminal-side ports (rcv out and xmt in). Set each switch to the 1200,

600, or 150 position as required. In general, 1200-ohm impedance is used to

interface loaded cable, 600-ohm impedance is used to interface non-loaded

cable, carrier, SFor DX signaling units, terminating sets, or station apparatus,

and 150-ohm impedance is used to provide a small amount of slope

equalization through the deliberate impedance mismatch when the module

interfaces long section of non-loaded cable (see paragraph 2.07)

Facility-Side Sealing-Current/SX-Lead Options

3.08 Switch S6 conditionsthe 104001C to supplyinternally generated 25mA

sealing current, to accept externally supplied sealing current from the distant

end of the facility, or to derive normal simplex leads on the facility side.

Select the desired facility-side sealing current/SX-lead arrangement as

follows:

For normal SX-lead derivation on the facility-side, set S6 to SX.

For internally generated 25mA sealing current on the facility

side, set S6 to SOURCE.

FIGURE 6. 104001C Option Switch and Strap Locations.

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To provide a return path for sealing current applied from the far

end on the facility side, set to S6 to SINK.

Note 1: For instructions on setting S6 for a bypassed signaling arrangement,

see paragraph 3.10.

Note 2: When switch S6 is set to either SX, SINK, or SOURCE, switch S8 is

nonfunctional can therefore be left in either the REV or NORM position.

Terminal-Side Sealing-Current / SX-Lead Options

3.09 Switch S7 conditionsthe 104001C to supply internally generated 25mA

sealing current, to accept externally supplied sealing current from the far end

of the facility, or to derive normal simplex leads on the terminal side. Select

the desired terminal-side or sealing-current/SX-lead arrangements as follows:

For internally generated 25mA sealing current on the facility

side, set S7 to SOURCE.

To provide a return path for sealing current applied from the far

end on the facility side, set S7 to SINK.

For normal SX-lead derivation on the terminal side set S7 to SX.

Note 1: For instructions on setting S7 for a bypassed signaling arrangement,

see paragraph 3.10.

Note 2: When S7 is set to either SX, SINK, or SOURCE, Switch S8 is

nonfunctional and can therefore be left in either the REV or NORM position.

Bypassed Signaling

3.10 For bypassed signaling i.e., to provide a straight-through SX-lead

signaling path separate from the 104001C’s transmission paths, set switches

S6, S7, and S8 as follows:

For a normal straight-through signaling path (RCV IN SX to RCV OUT SX

and XMT IN SX to XMT OUT SX), set S6 and S7 to BYP and S8 to

NORM.

For a reversed straight-through signaling path (RCV IN SX to XMT IN SX

and RCV OUT SX to XMT OUT SX), as required to compensate for

polarity reversals in DX-signaling and ground-start applications, set S6 and

S7 to BYP and S8 to REV.

Alignment

3.11 This alignment procedure is divided into three parts: gain adjustment,

output level adjustment, and equalization. The gain adjustment procedure

(paragraph 3.12) covers local prescription alignment for applications where

the circuit-layout record (CLR) transmission requirement is expressed in

terms of expected measured gain (EMG). If the CLR transmission

requirement is expressed in terms of transmission level points (TLP’s), the

output level adjustment procedure (paragraph 3.013), which covers

composite prescription alignment of the circuit in which the module is used,

should be performed instead. If equalizer settings are not given on the CLR

or if the given settings do not adequately equalize the facility, frequency

response measurements should be taken and the module’s equalizer set as

described in paragraphs 3.14 through 3.17. Because the equalizers do not

affect 1004 Hz transmission levels, equalization may be introduced after

transmission levels are set.

Gain Adjustment (for levels expressed as EMG)

3.12 If the CLR transmission requirement is expressed as EMG, proceed as

directed below. If the transmission requirement is expressed as TLP’s,

proceed instead to paragraph 3.13.

Note: When the CLR transmission requirement is expressed as EMG, both

the transmit and receive portions of the transmission measuring set (TMS)

used for alignment must be optioned for 600 ohms.

Receive Channel:

1. Determine from the CLR whether gain or loss is required in the

receive channel, and set the front-panel RCV GAIN/LOSS switch to

GAIN or LOSS as appropriate.

2. Set all front-panel RCV LEVEL DIP switches for zero gain or loss,

i.e., to the OUT position.

3. If you have not already done so, insert the module into its mounting

and apply power.

4. Determine from the CLR the amount of receive-channel gain or loss

(in dB) required. Call this amount G RCV.

5. Arrange the transmit portion of a TMS for 1004Hz tone output at a

–G RCV dBm level and for 600-ohm impedance and connect it to the

module’s RCV IN jack.

6. Arrange the receive portion of the TMS for 600-ohm terminated

measurement and connect it to the module’s RCV OUT jack.

7. Set to IN that combination of front-panel RCV LEVEL DIP switches

which adds up to the required amount of gain or loss, as verified by a

0dBm reading on the TMS.

Transmit Channel:

8. Determine from the CLR whether gain or loss is required in the

transmit channel, and set the front-panel XMT GAIN/LOSS switch

to gain or loss as appropriate.

9. Set all front panel XMT LEVEL DIP Switches for zero gain or loss,

i.e., to the out position.

10. Determine from the CLR the amount of transmit channel gain or loss

(in dB) required. Call this amount G XMT.

11. Arrange the transmit portion of the TMS for a 1004Hz output at a

–G XMT dBm level and for 600-ohm impedance, and connect it to

the modules XMT IN jack.

12. Arrange the receive portion of the TMS for 600-ohm terminated

measurement, and connect it to the module’s XMT OUT jack.

13. Set to INthat combination offront-panel XMT LEVELDIP switches

which adds up to the required amount of gain or loss, as verified by a

0dBm reading on the TMS.

Output Level Adjustment (for levels expressed as TLP’s)

3.13 If the CLR transmission requirement is expressed as TLP’s, proceed as

directed below. Please be aware that this procedure requires end-to-end

measurements.

Note: If the CLR transmission requirement is expressed as TLP’s both the

transmit and receive portions of the local transmission measuring set (TMS)

must be optioned to match the impedance of the module ports to which they

are connected. If this is not possible due to the type of TMS available, re-

option the module to match the impedance of the TMS while alignment is

performed, and be certain to re-option the module appropriately after

alignment is completed.

Receive Channel:

1. Set all front-panel RCV LEVEL DIP switches for zero gain or loss,

i.e., to the out position.

2. If you have not already done so, insert the module into its mounting

and apply power.

3. Arrange the receive portion of a TMS for terminated measurement at

the terminal-side impedance selected on the module (see note above),

and connect it to the module’s rcv out jack.

4. Request personnel at the distant (facility-side) end of the circuit to

send 1004Hz tone at the CLR-specified level. Record the level

observed on the local TMS; this level is the receive input level

because the module is now optioned for zero gain or loss and no

equalization.

5. Refer to the CLR to obtain the required receive output level.

Determine the difference between the measured receive input level

and the required receive output level.

6. Depending upon whether gain or loss is required (as determined in

the preceding step), set the module’s front-panel RCV GAIN/LOSS

switch to GAIN or LOSS as appropriate.

7. Then set to in that combination of front-panel RCV LEVEL DIP

switches which adds up to the difference determined in step 5, as

verified by a proper receive output level reading on the local TMS.

ACCURATE ELECTRONICS INC Practice Section 104001C Rev B January 2014

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Transmit Channel:

8. Set all front-panel XMT LEVEL DIP switches for zero gain or loss,

i.e., to the OUT position.

9. Arrange the transmit portion of the TMS for 1004Hz tone output at

the CLR-specified transmit input level and for the terminal side

impedance selected on the module (see note above), and connect it to

the module’s XMT IN jack.

10. Request personnel at the distant (facility-side) end of the circuit to

measure and report the level of the received 1004Hz tone.

11. Determine the difference between the actual received level at the

distant end and the desired level at that end.

12. Depending upon whether gain or loss is required to achieve the

desired level at the distant end (as determined in the preceding step),

set the module’s front-panel XMT GAIN/LOSS switch to GAIN or

LOSS as appropriate.

13. Set to IN that combination of front-panel XMT LEVEL DIP switches

which adds up to the difference determined in step 11, as verified by

a proper receive input level at the distant end of the circuit.

Equalization Adjustment

3.14 To adjust the 4001’s receive and transmit active slope equalizers when

prescription equalization settings (i.e., the amount of equalized gain at

2804Hz re 1004Hz required for each channel) are given in the CLR, simply

set the module’s front panel RCV EQL and XMT EQL DIP switches

appropriately, as directed in paragraph 3.015. If, however, prescription

equalization settings are not given in the CLR or if the given settings do not

provide adequate results, it is necessary to perform equalization adjustment

as directed in paragraphs 3.016 through 3.018.

Prescription Receive and Transmit Equalization

3.15 Equalization is introduced via the front –panel RCV EQL and XMT

EQL DIP switches. The specific amount of equalized gain at 2804Hz (re

1004Hz) introduced via each individual DIP-switch position is indicated on

the front panel adjacent to the switch. These switch positions are cumulative;

the total amount of equalized gain (0 to 7.5dB) introduced into a channel is

the sum of that channel’s DIP-switch positions set to in. Because the amounts

of required equalization given in the CLR may be specified to the nearest

0.1dB (while the RCV EQL and XMT EQL IP switches are arranged in 0.5dB

increments), use the following guidelines for rounding up or down when

setting the switches: If, for example, 0.3 to 0.7dB of equalized gain is

required, set the switches to introduce 0.5dB. If 0.8 to 1.2dB of equalized

gain is required, set the switches to introduce 1dB. Similarly, if 1.3 to 1.7dB

of equalized gain is required, set the switches to introduce 1.5dB, and so on

upward through the switches’ range. If no equalization is required for a

channel, ensure that all of that channel’s equal DIP-switch positions are set

to out.

Non-Prescription Receive-Channel Post-Equalization Adjustment.

3.16 To determine the need for receive-channel post-equalization at the local

end of the facility, and to adjust the module’s receive equalizer when

prescription settings are not given in the CLR, proceed as follows:

1. Ensure that all front-panel RCV EQL, DIP-switch positions are set to

OUT for no equalization. Then remove the module from its mounting

position, ensure that both terminating-impedance switches (S1 and

S3) are correctly set, and reinsert the module into its mounting

position.

2. Arrange the receive portion of a transmission measuring set (TMS)

for terminated measurement at the terminal-side interface impedance

selected on the module. Connect the receive portion of the TMS to

the module’s RCV OUT jack. (The transmit portion of the TMS must

remain disconnected from the module at this time.)

Note: If the TMS does not provide and impedance setting that matches the

impedance selected on the module, re-option the module as necessary for a

proper impedance match during this procedure. Then, when this procedure

is completed, reset the module’s impedance as required.

3. Have the distant facility-side end send 1004Hz test tone at the CLR-

specified level. Verify that the TMS reading equals the CLR-

specified receive level; then measure and record the level.

4. Now have the distant facility-side end send 2804Hz test tone at the

CLR-specified level. Measure and record the received 2804Hz tone

level. Subtract this 2804Hz level from the 1004Hz level measured in

step C.

5. Set to IN the proper combination of RCV EQL DIP switches that

approximates as closely as possible the measured difference, i.e., the

amount of equalized gain required, as specified in Table 4.

Non-Prescription Transmit-Channel Post-Equalization for

Intermediate Applications.

3.17 In intermediate-repeater applications, transmit-channel equalization is

often used to post-equalize the input to the module’s transmit channel in the

same manner as the module’s receive equalizer. In such applications, to

determine the need for transmit-channel post-equalization at the local end of

the facility interfacing the module’s “terminal” side, and to adjust the

module’s transmit equalizer when prescription settings are not given in the

CLR, proceed as follows:

1. Ensure that all front-panel XMT EQL DIP-switch positions are set to

OUT for no equalization. Then remove the module from its mounting

position, ensure that both terminating-impedance switches (S1 and

S3) are correctly set, and reinsert the module into its mounting

position.

2. Arrange the receive portion of a transmission measuring set (TMS)

for terminated measurement at the facility-side interface impedance

selected on the module. Connect the receive portion of the TMS to

the module’s XMT OUT jack. (The transmit portion of the TMS

must remain disconnected from the module at this time.)

Note: If the TMS does not provide and impedance setting that matches the

impedance selected on the module, re-option the modules as necessary for a

proper impedance match during this procedure. Then, when this procedure

is completed, reset the module’s impedance as required.

3. Have the distant terminal-side end send 1004Hz test tone at the CLR-

specified level. Verify that the TMS reading equals the CLR-

specified receive level; then measure and record the level.

4. Now have the distant terminal-side end send 2804Hz test tone at the

CLR-specified level. Measure and record the received 2804Hz tone

level. Subtract this 2804Hz level from the 1004Hz level measured in

step 3.

5. Set to IN the proper combination of RCV EQL DIP switches that

approximates as closely as possible the measured difference, i.e., the

amount of equalized gain required, as specified in Table 4.

Non-Prescription Transmit-Channel Pre-Equalization for Terminal or

Intermediate Applications.

3.18 In both terminal and intermediate repeater applications, transmit-

channel equalization (i.e., pre-equalization) at the local end of the facility is

normally left flat (no equalization) in favor of receive-channel post-

equalization at the distant end of the facility. In such applications, to

determine the need for transmit-channel pre-equalization, and to adjust the

module’s transmit equalizer when prescription settings are not given in the

CLR, proceed as follows:

1. Ensured that all front-panel XMT EQL DIP switches are set to OUT

for no equalization. If you have not already done so, remove the

module from its mounting position, ensure that both terminating-

impedance switches (S1 and S3) are correctly set, and reinsert the

module into its mounting position.

2. Connect the transmit portion of the TMS, arranged for the terminal-

side interface impedance selected on the module, to the module’s

XMT IN jack.

ACCURATE ELECTRONICS INC Practice Section 104001C Rev B January 2014

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permission of: ACCURATE ELECTRONICS INC By accepting this document the recipient agrees to make every effort to prevent unauthorized use of this information.

Note: If the TMS does not provide an impedance setting that matches

impedance selected on the module, re-option the module as necessary for a

proper impedance match during this procedure. Then, when this procedure

is completed, reset the module’s impedance as required.

3. Send test tone at 1004Hz and 2804Hz at the CLR-specified transmit

input level toward the distant facility-side end. Have personnel at

that end measure the received levels, subtract the 2804Hz level from

1004Hz level, and report the result.

4. Set to IN the proper combination of XMT EQL DIP switches that

approximates as closely as possible the reported difference, i.e., the

amount of equalized gain required, as specified in Table 4.

TABLE 4. Equalized Gain Settings from Cable Loss Data.

1004 Hz –2804 Hz

Difference

Amount of Equalized Gain Required

0.0 to 0.2 dB

0.0 dB

0.3 to 0.7 dB

0.5 dB

0.8 to 1.2 dB

1.0 dB

1.3 to 1.7 dB

1.5 dB

1.8 to 2.2 dB

2.0 dB

2.3 to 2.7 dB

2.5 dB

2.8 to 3.2 dB

3.0 dB

3.3 to 3.7 dB

3.5 dB

3.8 to 4.2 dB

4.0 dB

4.3 to 4.7 dB

4.5 dB

4.8 to 5.2 dB

5.0 dB

5.3 to 5.7 dB

5.5 dB

5.8 to 6.2 dB

6.0 dB

6.3 to 6.7 dB

6.5 dB

6.8 to 7.2 dB

7.0 dB

7.3 to 7.7 dB

7.7 dB

4. CIRCUIT DESCRIPTION

4.01 This circuit description is intended to familiarize you with the 104001C

Prescription Line Amplifier for engineering and application purposes only.

Attempts to troubleshoot the unit internally are not recommended and may

void your warranty. Troubleshooting procedures should be limited to those

prescribed in Section 7 of this practice. Refer to the 104001C block diagram,

Figure 1. of this practice, as an aid in following this circuit description.

Note: The transmit and receive channels of the 104001C module are virtually

identical. Therefore, the description in paragraphs 4.02 and 4.03 applies to

both channels.

4.02 A transformer is used at each port (input and output) of each channel to

interface external circuits. Switch-selectable taps on the external-circuit side

of each transformer afford a choice of 1200, 600, or 150-ohm balance

terminating impedance on both sides (facility and terminal) of the module.

The internal-circuit side of each transformer is protected by a silicon voltage-

transient suppressor that limits transient voltages to a safe level and provides

surge protection. In addition, both transformers are center-tapped to derive

balanced simplex leads.

4.03 Signals entering each channel’s input port are coupled across the input

transformer and applied to the LEVEL ADJUST circuit and GAIN AMP.

The level adjust circuit is controlled by the channel’s front-panel

GAIN/LOSS and LEVEL switches. These switches allow selection of 0 to

24dB of gain or loss in 0.1dB increments. Signals at the output of the GAIN

AMP are applied to and active slope-type amplitude equalizer consisting of

the EQUALIZATION ADJUST circuit and EQL AMP. The

EQUALIZATION ADJUST circuit is controlled by the channel’s front-panel

EQL switches. These switches allow selection of 0 to 7.5dB of gain at

2804Hz (re 1004Hz) in 0.5dB increments. Signals at the output of the EQL

AMP are applied to the POWER AMP, which drives the output transformer.

4.04 The 104001C can be optioned to provide 25mA of internally generated

sealing current to metallic facilities on the facility and/or terminal sides of the

module, to accept externally generated sealing current from the far ends of

the facilities on both sides of the module, to derive normal simplex leads on

both sides of the module, or to provide bypassed (straight-through) simplex-

lead signaling via a path separate from the transmit and receive transmission

paths. Each of the 104001C’s two internal sealing-current sources has a

“ZAP” feature by which a greater amount of sealing current is provided for a

few seconds when power is initially applied to the module.

4.05 When the internal sealing-current source on the 4001’s facility side is

selected, sealing current is fed to the external 4wire facility though the

transmit output port (pins 41 and 47) and is returned to the module through

the receive input port (pins 7 and 13). When the internal sealing-current

source on the 104001C’s terminal side is selected, sealing current is fed to

the external 4wire facility through the transmit input port (pins 40 and 55)

and is returned to the module through the receive output port (pins 5 and 15).

When the externally supplied sealing current option is selected on either side

of the module, the center-tapped leads of the receive and transmit

transformers are connected together. This creates a return path that allows

the module to accept sealing current from an external source at the distant

end of the external facility. The third option settingprovides normalsimplex-

lead derivation at the module’s facility-side and/or terminal-side ports. When

optioned forbypassed (i.e., straight-through) SX-lead signaling, an additional

switch optioned selects either normal (RCV IN SX to RCV OUT SX and

XMT IN SX to XMT OUT SX) or reversed (RCV IN SX to XMT IN SX and

RCV OUT SX to XMT OUT SX) straight-through signaling.

4.06 The 400C’s facility-side (receive input and transmit output) transformers

are connected to both bridging and opening bantam-type test jacks, while the

terminal side (receive output and transmit input) transformers are connected

to opening bantam type test jacks only.

4.07 The Power Supply on the 104001C is simple series voltage regulator

that uses a zener diode as reference source. A series diode in the negative

input battery lead protects the circuit against reversed input-power

connections, and a transorb between input battery and ground limits high-

level supply transients to a safe level.

5. MECHANICAL OUTLINE

5.01 See FIGURE 2.

6. SPECIFICATIONS

Note: Transmit-channel and receive-channel specifications of the 104001C

are identical.

6.01 Electrical

Terminating impedances (all four ports):

1200, 600 or 150 ohms, balanced, switch-selectable

Flat Gain or Loss: 0 to 24dB of gain or 0 to 24dB of loss,

in switch- selectable 0.1dB increments,

with gain or loss selected via switch option

increments, prescription-set

Deviation from gain or loss setting indicated by front-panel switches:

+0.25dB maximum, re 1000Hz

Maximum Output Level: +10Bm

Total Harmonic Distortion: less than 1% at +10dBmoutput level

ACCURATE ELECTRONICS INC Practice Section 104001C Rev B January 2014

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Longitudinal Balance (each port): 55dB minimum, 150 to 3000Hz

Frequency Response (unequalized)): +0.5dB, 300 to 3000Hz, re 1000Hz

+0.3dB, 500 to 3000Hz, re 1000Hz

Amplitude Equalization:

active prescription slope-type providing from 0 to 7.5dB of gain at

2804Hz, re 1004Hz, in switch-selectable 0.5dB increments

Noise: 15dBrnC maximum at maximum gain

Delay Distortion: less than 100s, 300 to 3000Hz, re 1800Hz

(measured worst-case with equalization)

Crosstalk Loss between Channels: 85dBminimum at 1000Hz

75dB minimum at 3000Hz

Crosstalk Loss between Units in Adjacent, Above, or Below Shelf Slots:

90dBminimum at 1000Hz

85dB minimum at 3000Hz

Simplex (SX) Current:

120mA, maximum, with 5mA maximum unbalance

Internal Sealing-current Sources (facility and terminal sides):

25mA, balanced (with higher ZAP current for a few

seconds upon initial application of power to module)

Input Power Requirements when Neither Sealing-current Sources is used:

Voltage: -22 to –56VDC filtered, ground referenced

Current (at –48VDC): 75mA maximum, 30mA at idle

Input Power Requirements when Internal Sealing-current Sources are used:

Voltage: -42 to –56VDC filtered, ground referenced

Current (at –48VDC):

57mA at idle, 92mA maximum with one

sealing-current source active; 84mA at idle,

132mA maximum with both sealing-current

sources active

6.02 Environmental

Operating Environment: 20 to 130F (-7 to 54C)

Humidity: up to 95% R.H. (no condensation

6.03 Physical

Dimensions: 5.580” H x 1.420” W x 5.960” D

14.17cm H x 3.61cm W x 15.14cm D

Weight: 13 ounces (369 grams)

Mounting: relay rack or apparatus case via one position of an

Accurate Type-10 Mounting Shelf or one position of

an Accurate 246 Resistive Data Bridge Mounting Assembly

7. TESTING AND TROUBLESHOOTING

7.01 The Testing Guide Checklist (Table 5.) may be used to assist in the

installation, testing or troubleshooting of the 104001C Prescription Line

Amplifier. The checklist is intended as an aid in the localization of trouble

to a specific module. If a module is suspected of being defective, a new one

should be substituted and the test conducted again. If the substitute module

operates correctly, the original module should be considered defective and

returned to Accurate for repair or replacement as directed below. We strongly

recommend that no internal (component-level) testing or repairsbe attempted

on the module. Unauthorized testing or repairs may void the module’s

warranty. Also, if the module is part of a registered system, unauthorized

repairs will result in noncompliance with Part 68 of the FCC Rules and

Regulations.

TECHNICAL ASSISTANCE

7.02 Contact Accurate Electronics, Inc. 503.641.0118, FAX: 503.646.3903;

Mail: PO Box 1654, Beaverton OR 97075-1654.

RETURN PROCEDURE (FOR REPAIR)

7.03 To return equipment for repair, first contact Accurate Electronics, Inc.

Enclose an explanation of the malfunction, your company’s name and

address, the name of a person to contact for further information, and the

purchase order number for the transaction. Accurate Electronics willinspect,

repair, and retest the equipment so that it meets its original performance

specifications and then ship the equipment back to you. If the equipment is

in warranty, no invoice will be issued.

8. MAINTENANCE

8.01 No preventive maintenance is required. General care is recommended.

9. WARRANTY

9.01 All Accurate Electronics Inc. products carry a full FIVE (5) YEAR

warranty on materials and workmanship. See WARRANTY in front of

catalog.

Note: Warranty service does not include removal of permanent customer

markings on the front panels of Accurate Electronics’ modules, although an

attempt will be made to do so. If a module must be marked defective, we

recommend that it be done on a piece of tape or on a removable stick-on

label.

9.02 If a situation arises that is not covered in the checklist, contact Accurate

Customer Service as follows (telephone number are given below):

Contact Accurate Electronic Customer Service

9.03 If a module is diagnosed a defective, follow the replacement procedure

in paragraph 9.04 when a critical service outage exists (e.g., when a system

of a critical circuit is down and no spares are available). If the situation is not

critical, follow the repair and return procedure in paragraph 9.05.

Replacement

9.04 To obtain a replacement module, notify Accurate Electronics. Be sure

to provide all relevant information, including the 104001C part number that

indicates the issue of the module in question. Upon notification, we shall

ship a replacement module to you. If the module in question is in warranty,

the replacement will be shipped at no charge. Pack the defective module in

the replacement module’s carton, sign the packing slip included with the

replacement, and enclose it with the defective module (this is your return

authorization). Affix the preaddressed label provided with the replacement

module to the carton being returned, and ship the module prepaidto Accurate

Electronics.

Repair and Return

9.05 Return the defective module, shipment prepaid, to Accurate Electronics

Inc. :

ACCURATE ELECTRONICS INC.

ATTN: REPAIR AND RETURN

8687 SW HALL BLVD. #100

BEAVERTON, OREGON 97008 USA

ACCURATE ELECTRONICS INC Practice Section 104001C Rev B January 2014

WWW.ACCURATE.ORG PO BOX 1654 97075-1654 8687 SW HALL BLVD 97008 BEAVERTON OR USA 503.641.0118 FAX 503.646.3903

permission of: ACCURATE ELECTRONICS INC By accepting this document the recipient agrees to make every effort to prevent unauthorized use of this information.

FIGURE 1. CIRCUIT DESCRIPTION.

TABLE 5. Test Guide Checklist.

TEST

TEST PROCEDURE

NORMAL RESULTS

IF NORMAL CONDITIONS ARE NOT

MET, VERIFY:

Receive Level

Arrange transmit portion of transmission measuring set

(TMS) for 1004Hz tone output at –20dBm if module’s

RCV channel is optioned for gain or at 0dBm if

module’s RCV channel is optioned for loss. Also set

transmit portion of TMS for facility-side interface

impedance selected on module. Connect 1004Hz signal

to RCV in jack. Arrange receive portion of TMS for

terminated measurement at terminal-side inter-face

impedance selected on module, and connect it to RCV

out jack.

Signal level indicated on TMS

corresponds to receive gain or

loss setting on module.

- Power

- Wiring

- Proper impedance termination

(check for double termination)

- Impedance switches (S1 and S3) properly set

- Level switches (RCV gain/loss and RCV level)

properly set

- Replace module and re-test

Receive

Equalization

Maintain connections as above. Adjust RCV EQL

switches for no equalization (all switches set to out).

Adjust module’s receive output level for 0dBm at

1004hz. Change input frequency to 2804Hz and add

equalization (up to maximum) by setting RCV EQL

switches to in one by one.

Receive output level at 2804 Hz

increases to +7.5 dBm as

equalization is added.

- Input level at 2804Hz same as at 1004Hz

- Terminating impedance correct

Transmit Level

Arrange transmit portion of TMS for 1004Hz tone

output at –20 dBm if module’s XMT channel is optioned

for gain or at 0dBm if module’s XMT channel is

optioned for loss. Also set transmit portion of TMS for

terminal-side interface impedance selected on module.

Connect 1004Hz signal to XMT in jack. Arrange

receive portion of TMS for terminating measurement at

facility-side interface impedance selected on module,

and connected it to XMT out jack.

Signal level indicated on TMS

corresponds to transmit gain or

loss setting on module.

- Power

- Wiring

- Proper impedance terminations (check for double

terminations)

- Impedance switches (S1 and S3) properly set.

- Level switches (XMT gain/loss and XMT level)

properly set

- Replace module and re-test

Transmit

Equalization

Maintain connection as above. Adjust XMT EQL

switches for no equalization (all switches set to out.

Adjust module’s transmit output level for 0dBm at

1004Hz. Change input frequency to 2804Hz and add

equalization (up to maximum) by setting XMT EQL

switches to in one by one.

Transmit output level at 2804

Hz increases to +7.5 dBm as

equalization is added.

- Input level at 2804Hz same as at 1004Hz

- Terminating Impedance correct

FIGURE 1. CIRCUIT DESCRIPTION.

ACCURATE ELECTRONICS INC Practice Section 104001C Rev B January 2014

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FIGURE 2. MECHANICAL OUTLINE.

Indice

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