P6002ACMC datasheet(98/212 Pages) TECCOR

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SIDACtor® Data Book and Design Guide

Component Selection

The P2300SC MC SIDACtor device and the F1250T TeleLink fuse were chosen because

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

series resistance. The P2300SC MC voltage rating was selected to ensure loop powering

up to 190 V. For loop powering greater than 190 V, consider the P2600SC MC. The

P0080SA MC SIDACtor device was chosen to eliminate any sneak voltages that may

appear below the voltage rating of the P2300SC MC.

ISDN Circuit Protection

Integrated Services Digital Network (ISDN) circuits require protection at the Network

Termination Layer 1 (NT1) U-interface and at the Terminating Equipment (TE) or

Terminating Adapter (TA) S/T interface. Signal levels at the U-interface are typically ±2.5 V;

however, with sealing currents and maintenance loop test (MLT) procedures, voltages

approaching 150 V rms can occur. (Figure 3.11)

Figure 3.11 ISDN Overview

Protection Circuitry

Longitudinal protection was not used at either the U- or the TA/TE-interface due to the

absence of an earth-to-ground connection. (Figure 3.12) At the U-interface, the

P2600SC MC SIDACtor device and F1250T TeleLink fuse provide metallic protection, while

the TA/TE-interface uses the P0640SC MC SIDACtor device and F1250T TeleLink fuse.

Figure 3.12 also shows interfaces not isolated from earth ground.

ISDN Compliant

Central Office Switching

System

Network

Termination

Layer 1

NT1

ISDN DSL

2-Wire,

160 kbps

2B1Q ±2.5 V

Reference

NT2

PBX

S Reference, 4-Wire

T Reference

4-Wire

Terminal

Adapter

Terminal Equipment

(ISDN

Compliant)

POTS

Non-ISDN

Terminal

ISDN Terminal

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