P4802ACMC datasheet(138/212 Pages) TECCOR

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TIA-968 (formerly known as FCC Part 68)

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SIDACtor® Data Book and Design Guide

TIA-968 (formerly known as FCC Part 68)

TIA-968 applies to all terminal equipment connected to the Public Switched Telephone

Network (PSTN) and holds the “rule of law” by congressional order.

The purpose of TIA-968 is to provide a set of uniform standards to protect the telephone

network from any damage or interference caused by the connection of terminal equipment.

This standard includes environmental simulations such as vibration tests, temperature and

humidity cycling, drop tests and tests for hazardous voltages and currents, as well as tests

for signal power levels, line balance, on-hook impedance, and billing protection. All these

standards must be met before and after the environmental tests are applied.

Overvoltage Test

TIA-968 compliant equipment must undergo an overvoltage test that includes a Type A and

Type B Metallic Voltage Surge and a Type A and Type B Longitudinal Voltage Surge. These

surges are part of the environmental simulation, and although a provision does allow the

EUT to reach an open circuit failure mode during the Type A tests, failures must:

1. Arise from an intentional design that will cause the phone to be either disconnected from

the public network or repaired rapidly

2. Be designed so that it is substantially apparent to the end user that the terminal

equipment is not operable

A common example of an acceptable failure would be an open circuit due to an open

connection on either Tip or Ring.

For Type B surges, equipment protection circuitry is not allowed to fail. The EUT must be

designed to withstand Type B surges and continue to function in all operational states.

Metallic Voltage Surge

The Type A and Type B Metallic Voltage Surges are applied in both the positive and

negative polarity across Tip and Ring during all operational states (on-hook, off-hook,

ringing, and so on). The Type A surge is an 800 V, 100 A peak surge while the Type B

surge is a 1000 V, 25 A peak surge, as presented in Table 4.14.

Notes:

• For Type A surges, the EUT may pass either “operationally” or “non-operationally.”

• For Type B surges, the EUT must pass “operationally.”

• The peak current for the Type A longitudinal surge is the total available current from the surge generator.

• The peak current for the Type B longitudinal surge is the current supplied to each conductor.

Table 4.14 TIA-968 Voltage Surge

Surge

Type

Peak

Voltage

(VPK)

Rise &

Decay Time

(Voltage Waveform)

Peak

Current

(A)

Rise &

Decay Time

(Current Waveform)

Repetitions

Each Polarity

Metallic A

±800

10x560 µs

100

10x560µs

Longitudinal A

±1500

10x160 µs

200

10x160µs

Metallic B

±1000

9x720 µs

5x320µs

Longitudinal B

±1500

9x720 µs

37.5

5x320µs

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