Black Box ME615A Manuale utente

MARCH 2007

ME615A

ME615AE

ME616A

ME616AE

CUSTOMER SUPPORT

INFORMATION

Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)

FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746

Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018

Web site: www.blackbox.com • E-mail: [email protected]

Miniature Asynchronous

Modems

Declaration of Conformity

The Async Mini Fiber Optic Modem conforms to the

following standard(s) or other normative document(s):

EMC:

EN 55022 (1994): Limits and methods of measurement

of radio disturbance characteristics of information

technology equipment.

EN 50082-1 (1992): Electromagnetic compatibility –

Generic immunity standards for residential, commercial

and light industry.

Supplementary Information:

The product herewith complies with the requirements of

the EMC Directive 89/336/EEC. The product was tested

in a typical configuration.

Application 5

ME615A, ME615AE,

ME616A, ME616AE

1. Features

• Provide asynchronous transmission at data rates of up to 115.2 kbps

• Operate in full-duplex over 4-wire or half-duplex over 2-wire and 4-wire lines

• Meet ITU RS-485 and ITU V.11 requirements

• Meet ITU V.54 and ITU V.52 requirements (in V.11 only)

• Operate over multimode fiber optic cables

• Point-to-point or multipoint applications with up to 32 units in RS-485

• Six LED indicators

• Miniature, lightweight and easy to install

• Operate with an external power supply

2. Application

Figure 1. Typical Application

ME615A, ME615AE, ME616A, ME616AE

6 Description

3. Description

ME615A, ME615AE, ME616A, ME616AE , asynchronous RS-485 miniature fiber

optic modems, transmit an RS-485 or V.11 signal via a fiber optic link. They are

typically used for data transmission in utility applications. The asynchronous data

rate can be up to 115.2 kbps in full- or half-duplex mode.

The modems perform diagnostic loopbacks in compliance with ITU V.54 standard.

Two V.54 loopbacks are available: local analog (Loop 3) and remote digital

(Loop 2). The loopbacks are activated via external DIP switches. Local digital

loopback is also available. The loopbacks are available in V.11 mode only.

The devices include a built-in V.52 standard BER tester for testing link integrity.

The internal BER tester is activated by an external DIP switch. The ERR LED blinks

when an error is detected in the data transmission.

ME615A, ME615AE, ME616A, ME616AE incorporate all the advantages of a fiber

optic system, providing:

• Lower attenuation than with copper wire

• EMI/RFI immunity, saving the cost of expensive and heavy shielding, and

complex error checking routines

• Almost absolute security and reduction in the cost of data encryption

• Eavesdropping is virtually impossible as negligible power is radiated from the

fiber

• Safety and electrical isolation: no spark hazard and no ground-loop noise

problems.

The modems operate with an external 9 VDC, 300 mA power supply.

ME615A, ME615AE, ME616A, ME616AE

Technical Specifications 7

4. Technical Specifications

Fiber Optic Interface Transmission Line Optical duplex cable

Transmission Mode Full- or half-duplex

Fiber Optic Characteristics See Table 1

Fiber Optic Connectors ST, FC, or SC

DTE Interface Type V.11 over 4-wire

RS-485 over 2-wire or 4-wire

Data Rate Up to 115.2 kbps

Pulse Width Distortion Less than 25%

DTE Transmission Mode Full- or half-duplex, user-selectable

DTE Connectors RJ-45 or 5-clip terminal block

LED Indicators TD (yellow) – Transmit Data

RD (yellow) – Receive Data

ERR (yellow) – BERT error

RTS (yellow) – Request to Send

DCD (yellow) – Data Carrier Detect

TST (red) – A test is active

Power 9 VDC, 300 mA

Physical Length 10.0 cm (3.9 in)

Height 2.3 cm (0.9 in)

Width 5.3 cm (2.1 in)

Weight 140g (4.9 oz)

Environment Temperature 0–50°C (32–122°F)

Humidity Up to 90%, non-condensing

ME615A, ME615AE, ME616A, ME616AE

8 Installation

5. Installation

When setting the jumpers or performing any actions inside the open product, be

careful not to bend or break any components.

 To install ME615A, ME615AE, ME616A, ME616AE :

1. Open the plastic case by pressing on the points indicated on the sides.

2. Configure the modem according to the desired mode (see Figure 1 and

Table 1).

CARR. HOLD

1.1

PATT

DIG

ANA

REM

4.4

8.8

17.7

H.D/F.D

4W/2W

Figure 1. DIP Switch Locations

3. For full- or half-duplex operation over 4-wire:

 Set the H.D./F.D. switch to F.D. for full-duplex or H.D. for half-duplex

 Set the 4W/2W switch to 4W.

4. For half-duplex operation over 2-wire:

 Set the H.D./F.D. switch to H.D.

 Set the 4W/2W switch to 2W.

5. Set the CARR. HOLD switch to 4.4 msec.

6. Close the unit by pressing the two halves of the unit together.

7. Connect the DTE:

For the terminal block versions:

 Connect the 4- or 2-wire UTP or STP line, observing the following polarity:

4-wire: TDA and TDB clips are data output from the modem; RDA and

RDB clips are data input to the modem (see Figure 2).

2-wire: RDA and RDB clips are data input/output in and from the modem

(see Figure 2).

Caution

ME615A, ME615AE, ME616A, ME616AE

Installation 9

TDB

GND

RDB

RDA

TDA

Figure 2. Terminal Block Connector Pinout

For RJ-45:

 Plug the cable into the RJ-45 jack (see Figure 3).

1 8

RJ-45 plug (male)

clip at rear

RJ-45 jack (female)

external view

8 NC

7 NC

6 TDA

5 RDB

4 RDA

3 TDB

2 GND

1 NC

Figure 3. RJ-45 Connector Pinout

8. Connect the line:

 Remove the plastic dust caps from the fiber optic connectors, and connect

the cable, observing the following polarity:

 Connect Tx on the local modem to Rx on the remote modem

 Connect Rx on the local modem to Tx on the remote modem.

9. Connect the external power supply to ME615/6 A/AE, and then plug it into the

mains.

ME615A, ME615AE, ME616A, ME616AE

10 Installation

Table 1. DIP Switch Settings

Switch Switch

Identity

Function Possible Settings

(Factory settings shown in bold)

S3-1 H.D./F.D. Selects the transmission mode on the

DTE side

H.D. – Half-duplex operation, RS-485

F.D. – Full-duplex operation, V.11

S3-2 4W/2W Selects the operation type of the

RS-485 interface

4W – 4-wire operation

2W – 2-wire operation

S2-1,

S2-2,

S2-3,

S2-4

CARR. HOLD

(see Note)

Selects the length of time that the

modem maintains transmission when

received data from RS-485 interface

becomes mark or idle (carrier delay)

1.1 msec

4.4 msec

8.8 msec

17.7 msec

S1-1 PATT Controls the BER testing See Operation (OFF)

S1-2 DIG Controls the local digital loopback See Operation (OFF)

S1-3 ANA Controls the local analog loopback See Operation (OFF)

S1-4 REM Controls the remote digital loopback See Operation (OFF)

Set the carrier delay to 1.1 msec when working at the high data rate.

For the low data rate applications, set the carrier delay to 17.7 msec.

Note

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