Test Lines for CCITT 7 ISUP Trunks in a DMS-300

The CCITT-recommended digits for the T100 test line are 64.  To use the T100 test line on a CCITT trunk, the entry in field TSTNOIND (table CLLIMTCE) must point to subtable TSTLCONT.TLNOS, which translates the T100 test line code to 64.  The required datafill for fields TESTLINE, TLNUMBER, and TL_MFC_OG_SIG are shown in Table 4 below.

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Table 4
CCITT 7 ISUP Protocol Datafill

TESTLINE          TLNUMBER          TC_MFC_OG_SIG
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T100              64                N
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Originating 105 Test Line

Each Transmission Test Unit (TTU) circuit consists of a control signal generator card and a digital filter.  Table 5 lists pairs of interconnected cards that can be provisioned together to form a TTU for the listed test procedure type.

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Table 5
Transmission Test Unit Pairs

Control Signal
Generator           Digital Filter      Test Procedure Type
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NT2X47AA            NT2X56AA            ATME2 (rated MD)

NT2X47AB            NT2X56AA            ATME2 (DMS-300 switching units)

NT2X47AC            NT2X56AB            ATME2 (104 test line) and ATMS (105 test line)

NT2X47AD            NT2X56AB            ALT (Automatic Line Testing) and ATMS (105 test line)

NT2X47BA            NT2X56BA            International (A-law) ATME and ATMS
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Originating 105 Test Line - New Tests Provided with NT2X47AD

Table 6 shows the new tests provided by the NT2X47AD card.

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Table 6
New Tests for Originating 105 Test Line

Test        Description of Test
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ERL         Echo Return Loss measurement with quiet termination

ERLSC       Echo Return Loss Self-Check with quiet termination
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