363-206-295
Maintenance Description
Issue 1
December 1997
9-17
provisionable holdoff delay and a fixed 15-second clear delay. Yellow signals are
not subject to holdoff or clear delays. Circuit pack failures (except control circuit
pack failures) are subject to the provisionable holdoff and clear delays. Refer to
the
set-attr-alm
and
rtrv-attr-alm
commands in Section 11, "Commands and Reports."
Protection Switching
9
The DDM-2000 OC-12 Multiplexer provides equipment protection switching of all
transmission and synchronization circuit packs and uses SONET standard
automatic protection switching for the OC-3 and OC-12 lines. Installation of
protection switching equipment is optional. Protection switching occurs in
response to automatically detected faults in the circuit packs or OC-3 and OC-12
lines as well as external commands from a technician at a local/remote CIT or
TL1/X.25 message-based OS interface. The DDM-2000 OC-12 Multiplexer uses
SONET protection switching priorities for all transmission protection groups. Refer
to the
switch-line
,
switch-fn
,
switch-sync
, and
switch-tsi
commands
in Section 11, "Commands and Reports."
Automatic Line Protection
9
The DDM-2000 OC-12 Multiplexer uses the optional SONET 1+1 unidirectional
nonrevertive automatic protection switch (APS) procedures. This means that after
a cut service fiber is repaired, a location does not switch back (revert) and select
the service set as its active fiber/OLIU set.
Status of ACTIVE LED on OLIUs
9
Figure 9-5 illustrates examples of unidirectional and nonrevertive line protection
switches. Note the squares at locations A and C. Each square represents the
transmit or receive section of an OLIU. Figure 9-5(a) and Figure 9-5(b) are
associated with the Service (S) OLIU and Figure 9-5(d) and Figure 9-5(e) with the
Protection (P) OLIU. Four optical fibers are associated with the Service and
Protection OLIUs that interconnect the OLIUs at locations A and C. The two fibers
connecting the Service OLIUs are the service fibers, and the two fibers
connecting the Protection OLIUs are the protection fibers. Fibers and OLIUs
shown in bold are active and carrying service.
Содержание DDM-2000 OC-12
Страница 1: ...363 206 295 Issue 1 December 1997 DDM 2000 OC 12 Multiplexer Release 7 0 User Service Manual Volume I ...
Страница 37: ...Tables xxxviii Issue 1 December 1997 A A SONET Overview A 1 SONET Payloads A 18 A 2 SONET Transport Rates A 19 ...
Страница 506: ...INS PROG 8 of 8 Page INS PROG COMMANDS RELATED rtrv eqpt rtrv ne OC 12 DDM 2000 1997 December 1 Issue 11 89 ...
Страница 528: ...RTRV ATTR ALM 2 of 2 Page RTRV ATTR ALM COMMANDS RELATED set attr alm OC 12 DDM 2000 1997 December 1 Issue 11 111 ...
Страница 565: ...RTRV OC3 3 of 3 Page RTRV OC3 COMMANDS RELATED rtrv sync 11 148 1997 December 1 Issue OC 12 DDM 2000 ...
Страница 664: ...SET FEAT 3 of 3 Page SET FEAT COMMANDS RELATED rtrv feat OC 12 DDM 2000 1997 December 1 Issue 11 247 ...
Страница 766: ... Ctl T TOGGLE 2 of 2 Page Ctl T TOGGLE COMMANDS RELATED logout rlgn OC 12 DDM 2000 1997 December 1 Issue 11 349 ...
Страница 847: ...Multiplexer OC 12 DDM 2000 7 Release TARP TOP Manual User Service II Volume 363 206 295 1 Issue 1997 December ...
Страница 867: ...363 206 295 TOP Maintenance and Operation BLANK LEFT INTENTIONALLY PAGE THIS 12 1997 December 1 Issue ...
Страница 1145: ...Order Circuit 363 206 295 NTP 029 1 of 1 Page 1997 December 1 Issue Unused LISTED ORDER IN BELOW ITEMS DO TO GO DETAILS FOR ...
Страница 1146: ...Order Circuit 363 206 295 NTP 030 1 of 1 Page 1997 December 1 Issue Unused LISTED ORDER IN BELOW ITEMS DO TO GO DETAILS FOR ...
Страница 1182: ...Turnup System 363 206 295 NTP 033 1 of 1 Page 1997 December 1 Issue Unused LISTED ORDER IN BELOW ITEMS DO TO GO DETAILS FOR ...
Страница 1243: ...Clearing Trouble 363 206 295 TAP 107 1 of 1 Page 1997 December 1 Issue Unused ...
Страница 1393: ...363 206 295 DLP 513 1 of 1 Page 1997 December 1 Issue Unused ...
Страница 1394: ...363 206 295 DLP 514 1 of 1 Page 1997 December 1 Issue Unused ...
Страница 1456: ...363 206 295 DLP 523 7 of 7 Page 1997 December 1 Issue OC 12 via Access Broadcast Video for Cross connections of Example 4 Figure ...
Страница 1465: ...DLP 525 363 206 295 1997 December 1 Issue 6 of 2 Page Schematic Ring Virtual ATM Sample 1 Figure ...
Страница 1469: ...DLP 525 363 206 295 1997 December 1 Issue 6 of 6 Page Ring Virtual ATM OC 12 DDM 2000 for Cross connections of Example 4 Figure ...
Страница 1565: ...363 206 295 DLP 543 6 of 5 Page 1997 December 1 Issue Network Broadcast Video of Test Transmission 2 Figure ...
Страница 1566: ...DLP 543 363 206 295 1997 December 1 Issue 6 of 6 Page Network Ring Virtual ATM of Test Transmission 3 Figure ...