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AN273

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
芯科 - SILICON		测试
页数	文件大小	规格书
8页	214K
描述
GR-909 TESTING WITH THE Si321X PROSLIC㈢

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AN273

GR-909 TESTING WITH THE Si321X PROSLIC^®

1. Introduction

This document describes how line fault testing (such as GR-909) may be implemented using the Si321X family of

ProSLIC devices. Demonstration code for each test is available.

2. GR-909 Metallic Loop Tests

The five metallic loop tests described by GR-909 are as follows:

1. Hazardous Potential Test

Under any condition, the following must be detected

>50 V

ac voltage from TIP-GND or RING-GND

RMS

>135 V dc voltage from TIP-GND or RING-GND

2. Foreign Voltage Test

Under any condition, the following voltages not generated by the SLIC must be detected

>10 V

ac from TIP-GND or RING-GND

RMS

>6 V dc from TIP-GND or RING-GND

3. Resistive Faults Test

Detect the following resistive line faults

<150 kΩ TIP-RING, TIP-GND, or RING-GND

4. Receiver Off-hook Test

Distinguish between resistive fault <150 kΩ and an off-hook receiver

5. Ringing Equivalency Number Test

Determine the REN (Ringer Equivalency Number) of the terminating receiver is between 0.175 REN and

5 REN. Reject if outside that range.

Each of these tests can be implemented on the Si321x devices. Table 1 enumerates the test cases, the measure-

ment method implemented, and the failing criteria.

Table 1. GR-909 Metallic Loop Tests

GR-909 Test

Test Description

Linefeed State

Measurement

Failure Criteria

Hazardous Potential

OPEN

and V

> 50 Vrms ac

> 135 V dc

TIP

RING

Foreign Voltage

OPEN

and V

> 10 Vrms ac

> 6 V dc

TIP

RING

Resistive Faults

Offhook

TIP-OPEN, RING-OPEN

TIP-OPEN

, R , R

>150 kΩ

Detect/No-detect

> 5 REN

TG RG TR

REN

RINGING

PQ2

Rev. 0.1 2/06

AN273

12 3 4 5 6 7 8

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