AN34 Просмотр технического описания (PDF) - Cirrus Logic

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AN34

Secondary Line Protection for T1 and E1 Line Cards

Cirrus Logic 

T1/E1 Line Protection

Bellcore TR-NWT-001089

Bellcore Technical Reference TR-NWT-001089,

entitled "Electromagnetic Compatibility and

Electrical Safety Generic Criteria for Network

Telecommunications Equipment", contains re-

quirements for both inside and outside plant

network equipment and customer premises

equipment which will be used in a Regional Bell

Operating Company (RBOC) network. This

TR-NWT-001089 Type:

Section

Requirement

1234

2.4 ESD Immunity

XXXX

3.2 EMI

XXXX

4.5.3 NRTL Listing

XXXX

4.5.4

Short-Circuit Test

(Telecom Ports)

X

X

4.5.6

First-Level Lightning Surge

Test (Telecom Ports)

X

X

4.5.7

Second-Level Lightning Surge

Test (Telecom Ports)

X

X

4.5.8

Intra-Building Lightning Surge

Test (Telecom Ports)

X

X

X

X

4.5.9

AC Lightning Surge Test

(AC power Ports)

XXXX

4.5.10

Current Limiting Protector

Test (Telecom Ports)

X

XX

4.5.11

First-Level AC Power Fault

Test (Telecom Ports)

X

X

4.5.12

Second-Level AC Power Fault

Test (Telecom Ports)

X

Second-Level AC Power Fault

4.5.13 Test Series Equipment

X

(Telecom Ports)

4.5.14

Second-Level AC Power Fault

Test CPE (Telecom Ports)

X

X

Second-Level Intra-Building

4.5.15 AC Power Fault Test

X

(Telecom Ports)

5 Steady State Power Induction X

X

6 DC Potential Difference

X

X

7 Electrical Safety

XXXX

8 Corrosion

X

X

9 Bonding and Grounding

XXXX

Table 1. TR-NWT-001089 Requirements vs.

Equipment Type

document consolidates Electromagnetic Com-

patibility (EMC) and safety requirements found

in TR-NWT-000063, FR-NWT-000064 and TR-

TSY-000499. In all future issues of these

standards, EMC and safety criteria will be re-

placed by references to TR-NWT-001089.

Under TR-NWT-001089 telecommunications

equipment is classified into one of four type

categories based upon the nature of its connec-

tion to the network and intended operating

environment. Table 1 summarizes the major re-

quirements in TR-NWT-001089 which apply to

each equipment type. The following sections

summarize the lightning surge, AC power fault,

current limiting protector, and short-circuit tests

for telecommunications ports.

Lightning Immunity

TR-NWT-001089 has lightning immunity tests

for equipment installed on inside lines only (type

2 or 4 systems) and tests for equipment installed

on outside lines (type 1 or 3 systems). These

tests use the standard double exponential surge

waveform shown in Figure 1.

P

0.9P

(PEAK VALUE)

0.5P

FRONT TIME = 1.25 (b-a) = T1 - T0

DURATION = (T2 - T0 )

0.1P

T0 a

b T1

T2

TIME

Figure 1. Double Exponential Surge Waveform

4

AN34REV1

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