P3602ACMC datasheet(105/212 Pages) TECCOR

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Analog Line Cards

3 - 17

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SIDACtor® Data Book and Design Guide

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Analog Line Cards

Given that line cards are highly susceptible to transient voltages, network hazards such as

lightning and power cross conditions pose a serious threat to equipment deployed at the

central office and in remote switching locations. To minimize this threat, adequate levels of

protection must be incorporated to ensure reliable operation and regulatory compliance.

Protection Requirements

When designing overvoltage protection for analog line cards, it is often necessary to

provide both on-hook (relay) and off-hook (SLIC) protection. This can be accomplished in

two stages, as shown in Figure 3.20.

Figure 3.20 SLIC Overview

The following regulatory requirements may apply:

• GR 1089-CORE

• ITU-T K.20/K.21

• UL 60950

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

On-Hook (Relay) Protection

On-hook protection is accomplished by choosing a SIDACtor device that meets the

following criteria to ensure proper coordination between the ring voltage and the maximum

voltage rating of the relay to be protected.

VDRM > VBATT + VRING

£ VRelay Breakdown

This criterion is typically accomplished using two P2600S_ SIDACtor devices (where _

denotes the surge current rating) connected from Tip to Ground and Ring to Ground.

However, for applications using relays such as an LCAS (Line Card Access Switch),

consider the P1200S_ from Tip to Ground and the P2000S_ from Ring to Ground.

On Hook

Protection

Off Hook

Protection

F1250T

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