P6002ACMC datasheet(113/212 Pages) TECCOR

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PBX Systems

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PBX Systems

Branch Exchange Switches

PBXs, KSUs, and PABXs contain line cards that support various transmission protocols

such as ISDN, T1/E1, HDSL, and ADSL (Figure 3.31). PBXs also have features such as a

POTS (plain old telephone service) pull-through which allows stations to have outside line

access in the event of power failure. All incoming lines to the PBX are subject to

environmental hazards such as lightning and power cross.

Figure 3.31 PBX Overview

Protection Requirements

Branch exchange switches should be protected against overvoltages that can exceed

800 V and surge currents up to 100 A.

The following regulatory requirements apply:

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

• UL 60950

Branch Exchange Reference Circuit

See the following sections of this data book for interface circuits used to protect of PBX line

cards:

• For POTS protection, see "Customer Premises Equipment (CPE)" on page 3-3.

• For ADSL protection, see "ADSL Circuit Protection" on page 3-7.

• For HDSL protection, see "HDSL Circuit Protection" on page 3-8.

• For ISDN protection, see "ISDN Circuit Protection" on page 3-10.

• For T1/E1 protection, see "T1/E1 Circuit Protection" on page 3-14.

• For Station Protection, see "Analog Line Cards" on page 3-17.

Stations

To Network

Logic

PBX

POTS

T1/E1

ADSL

HDSL

ISDN

Station Primary

Protection

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