P2202ACMC datasheet(96/212 Pages) TECCOR

96 / 212 page

High Speed Transmission Equipment

http://www.teccor.com

3 - 8

+1 972-580-7777

SIDACtor® Data Book and Design Guide

Protection Circuitry

Longitudinal protection was not used at either the ADSL Transceiver Unit – Central Office

(ATU-C) interface or the ADSL Transceiver Unit – Remote (ATU-R) interface due to the

absence of earth ground connections. (Figure 3.8) In both instances, the P3500SC MC

SIDACtor device and the F1250T TeleLink fuse provide metallic protection. For ATUs not

isolated from earth ground, reference the HDSL protection topology.

Figure 3.8 ADSL Protection

Component Selection

The P3500SC MC SIDACtor device and F1250T TeleLink fuse were chosen to protect the

ATUs because both components meet GR 1089 surge immunity requirements without the

use of additional series resistance. Although the P3100 series SIDACtor device may be

used to meet current ANSI specifications, Teccor recommends the P3500 series to avoid

interference with the 20 VP-P x DSL signal on a 150 V rms ringing signal superimposed on a

56.5 V battery.

HDSL Circuit Protection

HDSL (High-bit Digital Subscriber Line) is a digital line technology that uses a 1.544 Mbps

(T1 equivalent) transmission rate for distances up to 12,000 feet, eliminating the need for

repeaters. The signaling levels are a maximum of ±2.5 V while loop powering is typically

under 190 V. (Figure 3.9)

TIP

RING

ADSL

chip set

P3500SC MC

F1250T

P2202ACMC bảng dữ liệu(PDF) 96 Page - Teccor Electronics