Procedure 11.7: IMPLEMENT 108-TYPE TEST LINE CAPABILITIES OF ISTF/GDSF
OVERVIEW
The
5ESS
®
-2000 switch can provide a digital-circuit loopback and transmit capability to test digital trunks, and this
procedure describes its implementation.
The ISTF/GDSF Loop-back Function
The digital service unit-2 (DSU2) integrated services test function (ISTF) and global digital services function (GDSF)
provides a 5ESS-2000 switch integrated services digital network (ISDN) peripheral unit support for transmission
testing of interoffice digital trunks and basic-rate interfaces through the use of a pseudo-random number (PRN) bit
pattern. The ISTF is physically located on the DSU2 shelf in ``loaded'' switching modules. The GDSF is physically
located on the DSU3 in switching module (SM)/switching module-2000(SM-2000) and CSU.
NOTE:
Effective with the 5E8 software release, the ISTF is also available in a ``basic'' and ``standard'' SM as well
as a ``loaded'' SM.
Each DSU2 shelf can have up to four ISTF units. An SM-2000 can have 32 GDSFs while an SM can have only one
GDSF. Two types of services are provided by the ISTF/GDSF:
Transmit pseudo-random number bit pattern
Digital loopback of the bits received.
The transmit service consists of a
send
side and a
receive
side. The send side generates an 11-bit shift register
PRN which has been recommended by the CCITT for digital testing. It expects a far-end device to loop back the bits
so the receive side can tell if any bits were altered during transmission. The ISTF can perform up to three
simultaneous transmit services. A GDSF is able to change configurations to provide circuits for the support of
transmit services. The number of GDSF digital transmit circuits determine the number of transmit services
simultaneously performed.
The loopback service also consists of a receive side and a send side. It takes the bits from the input channel and
places them on the output channel. The service provides two options:
inverting
and
noninverting
. The
noninverting
option copies the bits from the input channel directly to the output channel. The
inverting
option changes the polarity
of each bit. For example, an input bit that is a ``1'' is placed on the output channel as a ``0''. Each ISTF unit can
perform up to 31 simultaneous loopback services. A GDSF is able to change configurations to provide circuits to
support loopback services. The number of GDSF digital loopback circuits determine the number of loopback
services simultaneously performed.
The noninverting domestic 5ESS-2000 switch loopback test line for ISDN trunking meets the functional
requirements announced in the
ANSI
®
standard T1.206-1988 (Digital Exchanges and PBXs - Digital Circuit
Loop-back Test Line). The
ANSI
standard designates the test line as a 108-type test line.
The 5ESS-2000 switch 108-type test line deviates in one minor detail from the
ANSI
®
standard in that timeout is
currently fixed at 1 hour (in the event the caller fails to disconnect), whereas the
ANSI
®
specification calls for a
time-out period that can be set by the operating company.
108-Type Test Line Access
Currently, only 7-digit access is provided. The North American Numbering Plan recommends ``959'' as the NXX for
end-office testing. Bellcore TR-476 recommends 959-1080 as the directory number.
235-105-210
October 1999
Copyright © 1999
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Страница 516: ...Figure 10 24 1 KS 23483 L13 Disk Drive Cable Connection Rear View 235 105 210 October 1999 Copyright 1999 Page 2 ...
Страница 517: ...Figure 10 24 2 KS 23483 L21 Disk Drive Cable Connection Rear View 235 105 210 October 1999 Copyright 1999 Page 3 ...
Страница 518: ...Figure 10 24 3 KS 23841 L15 Disk Drive Cable Connection Rear View 235 105 210 October 1999 Copyright 1999 Page 4 ...
Страница 523: ...Figure 10 24 6 Top View of DUP Showing Internal Cabling 235 105 210 October 1999 Copyright 1999 Page 9 ...
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Страница 628: ...a SM inhibited Response OK 2 STOP YOU HAVE COMPLETED THIS PROCEDURE 235 105 210 October 1999 Copyright 1999 Page 8 ...
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Страница 799: ...Figure 11 36 3 1 Cleaning Points 235 105 210 October 1999 Copyright 1999 Page 7 ...
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Страница 1008: ...Figure 11 55 1 CTSNS DIP Switch Settings 235 105 210 October 1999 Copyright 1999 Page 2 ...
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Страница 1284: ...Figure 15 15 1 PARADYNE Paradyne Corporation 3810 Modem Diagnostic Control Panel 235 105 210 October 1999 Copyright 1999 Page 6 ...
Страница 1287: ...Figure 15 16 1 153A Adapter Connection Figure 15 16 2 AMATPS Block Diagram 235 105 210 October 1999 Copyright 1999 Page 3 ...
Страница 1289: ...Figure 15 17 2 AMATPS Data Link 235 105 210 October 1999 Copyright 1999 Page 2 ...
Страница 1290: ...Figure 15 17 3 Single Housing B25A Cable Assembly 235 105 210 October 1999 Copyright 1999 Page 3 ...
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Страница 1324: ...11 Type and enter q 12 STOP YOU HAVE COMPLETED THIS PROCEDURE 235 105 210 October 1999 Copyright 1999 Page 2 ...
Страница 1342: ...Figure 15 40 1 SCANS II Dial Up Data Set Installation Diagram 235 105 210 October 1999 Copyright 1999 Page 2 ...
Страница 1344: ...Figure 15 40 4 59A1 Mounting Front in Slot J3 Figure 15 40 5 2048A Data Set Front 235 105 210 October 1999 Copyright 1999 Page 4 ...
Страница 1345: ...Figure 15 40 6 Berg Connector Terminations and Layout 235 105 210 October 1999 Copyright 1999 Page 5 ...
Страница 1346: ...Figure 15 40 7 B25A Cable 4 STOP YOU HAVE COMPLETED THIS PROCEDURE 235 105 210 October 1999 Copyright 1999 Page 6 ...
Страница 1360: ...Figure 15 47 2 Typical SCANS III Link Diagram 235 105 210 October 1999 Copyright 1999 Page 2 ...
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Страница 1418: ...Figure 15 56 1 PARADYNE 3810 Modem Diagnostic Control Panel 235 105 210 October 1999 Copyright 1999 Page 4 ...
Страница 1421: ...Table 1 1 O M Checklist 235 105 210 October 1999 Copyright 1999 Page 3 ...