Comtest-networks MTAS-192 METALLIC TEST ACCESS SYSTEM Manuel d'utilisateur télécharger pdf (Page 15)

CT-IG-MTAS192-2008-v1_8.doc

Comtest Networks

MTAS-192

June 2006 Installation Guide

1.3.3 The Line Cards (Splitter Cards and Test Access Only Cards)

There are 6 unique types of line cards divided into 2 categories: Splitter Cards (4

varieties) and Test Access Only Cards (2 varieties) (refer to Table 2).

Each splitter card has a DSL (Digital Subscriber Loop) interface using a standard 50-pin

(25 pair) RJ-21 female connector. In addition, each splitter card has two TAPs (Test

Access Paths) and each TAP consists of 2 pairs of wires (making a 4-wire TAP):

• One for the upstream (Equipment) side called AE

• One for downstream (Facility) side called AF.

The AF (facility) pair is intended for testing on the line (facility) side and it is always used

in any test mode. The AE (equipment) pair is intended for testing on the equipment side.

Figure 9: Test Access Paths (TAPs)

Facility Side (F)

(Downstream)

Equipment Side (E)

(Upstream)

PSTN

Class 5

DSLAM

Splitter

DSL

Modem

123

456

789

CPE

Splitter

RTU (Test Head)

MTAU (MTAS -192)

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Comtest-networks MTAS-192 METALLIC TEST ACCESS SYSTEM Manuel d'utilisateur Page 15