P2202ACMC datasheet(99/212 Pages) TECCOR

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SIDACtor® Data Book and Design Guide

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Figure 3.12 ISDN Protection

Component Selection

The “SC MC” SIDACtor devices and F1250T TeleLink fuse were chosen because these

components meet GR 1089 surge immunity requirements without the use of additional

series resistance. An MC is chosen to reduce degradation of data rates. The P2600SC MC

voltage rating was selected to ensure coordination with MLT voltages that can approach

150 V rms. The voltage rating of the P0640SC MC was selected to ensure coordination with

varying signal voltages.

Pair Gain Circuit Protection

A digital pair gain system differs from an ISDN circuit in that ring detection, ring trip, ring

forward, and off-hook detection are carried within the 64 kbps bit stream for each channel

rather than using a separate D channel. The pair gain system also uses loop powering from

10 V up to 145 V with a typical maximum current of 75 mA. (Figure 3.13)

Figure 3.13 Pair Gain Overview

Tip

Ring

P2600SC MC

Power

Source

ISDN

Transceiver

F1250T

P0640SC MC

F1250T

Power

Sink

P0640SC MC

ISDN

Transceiver

ISDN U-Interface

ISDN S/T Interface

Switching

System

Line powered

DSL 2-Wire,

160 kbps

2B1Q

POTS

Line 1

Line 2

MDF

Central Office

Terminal (COT)

Remote

Terminal

Remote Terminal (RT)

building or pedestal

mounted

POTS

Customer

Premises

(CP)

Central Office (CO)

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