P4802ACMC datasheet(95/212 Pages) TECCOR

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High Speed Transmission Equipment

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SIDACtor® Data Book and Design Guide

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High Speed Transmission Equipment

High speed transmission equipment encompasses a broad range of transmission protocols

such as T1/E1, xDSL, and ISDN. Transmission equipment is located at the central office,

customer premises, and remote locations.

Protection Requirements

Transmission equipment should be protected against overvoltages that can exceed 2500 V

and surge currents up to 500 A. In Figure 3.7 through Figure 3.17, SIDACtor devices were

chosen because their associated peak pulse current (IPP) rating is sufficient to withstand the

lightning immunity tests of GR 1089 without the additional use of series line impedance.

Likewise, the fuse shown in Figure 3.7 through Figure 3.17 was chosen because the

amps2time (I2t) rating is sufficient to withstand the lightning immunity tests of GR 1089, but

low enough to pass GR 1089 current limiting protector test and power cross conditions

(both first and second levels).

The following regulatory requirements apply:

• TIA-968 (formerly known as FCC Part 68)

• GR 1089-CORE

• ITU-T K.20/K.21

• UL 60950

Most transmission equipment sold in the US must adhere to GR 1089. For Europe and

other regions, ITU-T K.20/K.21 is typically the recognized standard.

ADSL Circuit Protection

Asymmetric Digital Subscriber Lines (ADSLs) employ transmission rates up to 6.144 Mbps

from the Central Office Terminal (COT) to the Remote Terminal (RT) and up to 640 kbps

from the RT to the COT at distances up to 12,000 feet. (Figure 3.7)

Figure 3.7 ADSL Overview

Digital

Network

Local Loop

Remote Site

Central Office Site

ADSL

transceiver

unit

ATU-C

ATU-R

ADSL transceiver unit

PSTN

voice

data

POTS

video

Splitter

up to 12 kft

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