363-206-295
Transmission and Synchronization Interfaces
5-12
Issue 1
December 1997
DS1 Output Mode, SYNC OUT
5
In a CO environment, it may be necessary to externally synchronize a BITS to a
SONET reference with traceability to a primary reference source (PRS). When
optioned for SYNC OUT the DDM-2000 will output a derived DS1 traceable to a
selected OC-12 input. The frequency of the optical line is divided down to a 1.544
MHz signal and used to create the derived DS1.
When using SYNC OUT, two input timing modes are available: DS1 external-
timing or line-timing. These timing modes will only influence the synchronization
source used for the derived DS1. In SYNC OUT mode the DDM-2000 uses an
external DS1 reference for synchronization This external reference typically
comes from a BITS. In line-timing SYNC OUT mode, the DDM-2000 will use a
selected optical reference for synchronization. The derived DS1 is carried to the
BITS by a special SYNC OUT cable which is capable of externally timing the
DDM-2000 if the DS1 external SYNC OUT mode is selected. See 363-206-200,
DDM-2000 Multiplexer Applications, Planning, and Ordering Guide, for cabling
information.
If a TG provisioned for MULT is inserted into a DDM-2000 provisioned for SYNC
OUT the traceability of the DS1 output will be altered. This could result in
untraceable timing or the creation of timing loops. To ensure that replacement
packs are provisioned correctly, the DDM-2000 software monitors newly inserted
packs for the correct “shelf provisioning.” If a newly inserted pack does not match
the shelf provisioning, the fault LED is lit on that pack and indicates that a
provisioning error has occurred. It is always best to verify TG provisioning before
insertion.
The free-running, line-timing, and DS1 external timing modes can be combined
into various subnetwork configurations, some of which are shown in Figure 5-6.
The figures show basic single span configurations. In more complex subnetworks
such as hubbing, these basic span configurations are duplicated and/or mixed,
depending on the application, to produce a subnetwork synchronization
configuration.
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 ...