B E1/T1 Grounding Criteria - Huawei 9000 VCT V100R011 Administrator's Manual

Hd video terminal

Table of Contents

HUAWEI 9000 HD Video Terminal

Administrator Guide

Read the following grounding criteria carefully and comply with the relevant requirements

during the installation of the terminal.

The grounding design of the telecom office (station) follows the principle of equalized voltage.

That is, the work grounding and the protection grounding (including the shielded grounding and

the surge protection grounding of the distribution frame) share a set of grounding conductors.

When the E1 cable of the cabinet is over 7.5 m and the T1 cable of the cabinet is over 10 m, a

shielded cable and a shielded connector should be used and grounded.

When the E1 interface is connected with other devices using coaxial cables, the external shielding

layers at the transmitting terminal and receiving terminal should be connected to the protection

ground at the same time. The dual in-line package (DIP) switch offers the possible disconnection

function at the receiving end.

Copper-core materials instead of aluminum materials should be used for the grounding cable.

The plastic insulated copper wires with yellow and green insulation color should be used for the

protective earth cable. The protective earth cable should not exceed 30 m, and the shorter the

better. When the protective earth cable exceeds 30 m, the ground bar should be rearranged.

In a balanced circuit, the joint of the E1 (T1) cable and the connector should be grounded using

the external shielding layer (the grounding conductor) or an additional wire to ensure normal

reception and transmission in each E1 (T1) channel. In an unbalanced circuit, the metal braid

shielding layer of the cable should be seamlessly connected with the coaxial connector.

When the E1 cable exceeds 30 m and the T1 cable exceeds 40 m, use the multi-point grounding

mode. In addition, connect the E1 cable to the ground at every 15 m and the T1 cable to the

ground at every 20 m.

When the E1 or T1 cable is extended out of the office (station), the E1 or T1 cable should go

through the main distribution frame (MDF) attached with the security unit. The shielding layer

of the E1 or T1 cable should be firmly connected to the protection ground of the MDF. The

security unit on the MDF should have the overvoltage protection, overcurrent protection, and

failure alarm functions. The maintenance personnel should check the equipment periodically

and replace the ineffective protection unit in time.

Issue 09 (2012-09-03)

NOTE

For questions about grounding the device, contact the device provider for technical support.

Huawei Proprietary and Confidential

E1/T1 Grounding Criteria