P2202ACMC datasheet(97/212 Pages) TECCOR

97 / 212 page

High Speed Transmission Equipment

3 - 9

http://www.teccor.com

SIDACtor® Data Book and Design Guide

+1 972-580-7777

Figure 3.9 HDSL Overview

Protection Circuitry

Longitudinal protection is required at both the HDSL Transceiver Unit – Central Office

(HTU-C) and HDSL Transceiver Unit – Remote (HTU-R) interfaces because of the ground

connection used with loop powering. Two P2300SC MC SIDACtor devices provide

overvoltage protection and two F1250T TeleLink fuses (one on Tip, one on Ring) provide

overcurrent protection. (Figure 3.10) For the transceiver side of the coupling transformer,

additional overvoltage protection is provided by the P0080SA SIDACtor device. The

longitudinal protection on the primary coil of the transformer is an additional design

consideration for prevention of EMI coupling and ground loop issues.

Figure 3.10 HDSL Protection

DS-1 Rate

Interface

(1.544 Mbps)

DS-1 Rate

Interface

(1.544 Mbps)

Central Office Site

Remote Site

784 kbps Full-Duplex loop

< 12,000 ft, 200 kHz BW

+2.5 V signal level

2B1Q, ZO=135 W

HTU-C

HTU-R

HDSL transceiver unit

P2300SC MC

F1250T

Tip

Ring

P0080SA MC

P2300SC MC

F1250T

Tip

Ring

P0080SA MC

HDSL

Transceiver

Power

Sink

HTU-C/HTU-R Interface Protection

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