Black Box Balun G.703 Manuale utente

1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746

JUNE 1998

MT243A

MT243C-F

RM243A

G.703 Balun Module Panel Unit

G.703 Balun Module

G.703 Balun Chassis

CUSTOMER SUPPORT INFORMATION

Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX

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

Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018

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

CE NOTICE

CE Notice

The CE symbol indicates that the product is in

compliance with the Electromagnetic Compatibility

(EMC) directive and the Low Voltage Directive (LVD)

of the Union European (EU).

TRADEMARKS USED IN THIS MANUAL

Any trademarks mentioned in this manual are

acknowledged to be the property of the trademark

owners.

G.703 MODULES, MODULE PANEL, AND CHASSIS

1. Specifications

Data Rate — 2.048 Mbps

Transmission Line — CCITT G.703 (unstructured)

Connections — 75-ohm: Dual coax BNC connectors,

female (RG59 or 2002 coax); 120-ohm: Shielded RJ-45

jack

Link-to-Data Isolation — 500 volts AC/DC

Operating Temperature — 32 to 122°F (0 to 50°C)

Power Supply — None required

Size — Without handles, 3.5"H x 19"W x 1.9"D

(8.9 x 48.3 x 4.8 cm)

CHAPTER 2: Description

2. Description

2.1 Introduction

The G.703 Balun Module Panels match multiple sets of

dual 75-ohm coax connections to multiple 120-ohm

twisted-pair connections. This allows carriers to provide

120-ohm G.703 service to customers retaining 75-ohm

CPE hardware. It also allows carriers who have

standardized on 75-ohm coax to provide 120-ohm

terminations to their customers (in keeping with

European ONP requirements).

Supporting E1 data rates to 2.048 Mbps, the G.703

Balun Module Panels bi-directionally match not only

signal impedance, but also the pulse shapes of the

signals according to the CCITT G.703 standard. The

panels mount in a standard 19-inch rack and are

available with 1 to 16 modules per rack.

G.703 MODULES, MODULE PANEL, AND CHASSIS

2.2 Features

• Connects 75-ohm dual coax to 120-ohm twisted

pair.

• Bi-directional signal conversion according to

CCITT G.703.

• Data rates up to 2.048 Mbps.

• Low-profile design.

• Mounts in standard 19-inch rack.

• No AC power or batteries required.

• Strap-selectable modular (RJ-45) pinouts.

CHAPTER 3: Configuration

3. Configuration

Each G.703 Balun Module is equipped with four

jumpers that you may use to configure several

grounding options. This chapter shows the jumper

locations and describes their functions.

There are five configuration jumpers on the back of the

Module’s printed circuit board. These jumpers are

labeled JP1, JP2, JP3, JP4, and JP7. Figure 3-1 shows their

positions on the PC board as well as the relative pin

numbers on the jumpers.

G.703 MODULES, MODULE PANEL, AND CHASSIS

Figure 3-1. Jumper Location.

Figure 3-2 shows the orientation of the rear interface-

card straps. Note that the strap can either be on posts 1

and 2, or on posts 2 and 3.

Figure 3-2. Possible Positions for the Jumpers.

1 2 3 1 2 3

JP4

JP3

JP1

JP2

JP7

CHAPTER 3: Configuration

The jumper straps allow you to set shielding and

grounding options. The settings for each jumper strap

are shown in the table below. Following the table are

more detailed explanations of each jumper.

Table 3-1. Strap Summary Table

Strap Function Position 1&2 Position 2&3

JP1 Coax TX Shield & RJ-45 Pin 3 Open* Connected

JP2 Coax TX Shield & RJ-45 Shield Connected* Open

JP3 Coax RX Shield & RJ-45 Shield Connected* Open

JP4 Coax RX Shield & RJ-45 Pin 6 Open* Connected

JP7 RJ-45 Shield & Chassis Ground Connected* Open

*Indicates default setting

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