363-206-285
Detailed Level Procedure:
DLP-513
Issue 2, February 2000
Page 9 of 20
DDM-2000 OC-3 M
ULTIPLEXER
External - Mult
External - Mult
This topology is used when both NE’s have access
to and are receiving its timing from BITS clocks.
The recommendation is to have these BITS
synchronized to references which are traceable to
the same PRS. If these guidelines are followed the
subnetwork created by these two NE’s would be
operating synchronously. Note: DDM-2000
systems are designed to operate in pleisiochronous
timing topologies. The DS1 output generated by
each NE is regenerated from the input DS1 timing
reference and could be used to distribute this
reference to other shelves colocated in the same
bay to conserve ports on the BITS.
External - Mult
External - Sync Out
This topology is used to distribute network timing to
a target location from a location with access to a
synchronization reference. The NE provisioned for
External - Mult, is providing timing to the NE
provisioned for External - Sync Out, which in turn
generates a DS1 output reference regenerated
from the optical interface shared by both NE’s. This
DS1 output is used to provide a synchronization
reference to a BITS.
External - Sync Out
External - Sync Out
Caution! This topology can potentially create a
timing loop if synchronization messaging is not
enabled on both NE’s. In this topology both NE’s
will derive the DS1 output reference from each
other thus creating a timing loop. The NE with
access to a BITS, which has an input reference
traceable to a PRS, and is sourced from an element
other than this NE, should be reprovisioned for
External - Mult to prevent the timing loop. If
Synchronization Messaging is enabled on both
NE’s, the DS1 output reference in one of the NE’s
will carry DS1 AIS and the other NE will generate a
DS1 output carrying a framed DS1 all ones signal.
Line Timing
Line Timing
Caution! This topology creates a timing loop and it
is not. supported. The NE with access to an
external timing reference traceable to a PRS, if
available, should be provisioned for External - Mult.
If the reference available is an optical reference
provision to Line Timing with the proper source
using the
set-sync
command. If automatic
synchronization reconfiguration is supported and
enabled in a system, both NEs will attempt to switch
to another line timing source, if available, to prevent
a timing loop.
Table E – BBF2B/BBF2C TGS/BBF4 TG3 Synchronization Provisioning
Topologies (Contd)
NE 1
NE 2
Application Comments
Содержание DDM-2000 OC-3
Страница 4: ......
Страница 14: ...xiv Issue 3 June 2001 Contents GL Glossary GL 1 ...
Страница 24: ...xxiv Issue 3 June 2001 Figures ...
Страница 28: ...Tables xxviii Issue 3 June 2001 A A SONET Overview A 34 SONET Transport Rates A 20 ...
Страница 58: ...363 206 285 About This Document lviii Issue 3 June 2001 ...
Страница 60: ...1 ii Issue 3 June 2001 Table of Contents ...
Страница 80: ...363 206 285 System Introduction 1 20 Issue 3 June 2001 ...
Страница 154: ...3 ii Issue 3 June 2001 Table of Contents ...
Страница 184: ...4 ii Issue 3 June 2001 Table of Contents ...
Страница 252: ...363 206 285 Transmission and Synchronization Interfaces 5 60 Issue 3 June 2001 ...
Страница 254: ...6 ii Issue 3 June 2001 Table of Contents ...
Страница 278: ...7 vi Issue 3 June 2001 Table of Contents ...
Страница 338: ...363 206 285 Circuit Pack Descriptions 7 60 Issue 3 June 2001 Figure 7 22 IMA LAN Power Settings 48V 48V 48V 5V 5V 5V ...
Страница 436: ...363 206 285 Circuit Pack Descriptions 7 158 Issue 3 June 2001 ...
Страница 440: ...8 iv Issue 3 June 2001 Table of Contents ...
Страница 518: ...363 206 285 Administration and Provisioning 8 78 Issue 3 June 2001 ...
Страница 588: ...10 iv Issue 3 June 2001 Table of Contents ...
Страница 690: ...363 206 285 Commands and Reports 11 20 Issue 2 February 2000 ...
Страница 842: ...RTRV ATTR ALM 2 of 2 Page RTRV ATTR ALM COMMANDS RELATED set attr alm 11 172 2000 February 2 Issue OC 3 DDM 2000 ...
Страница 899: ...RTRV OC12 3 of 3 Page RTRV OC12 COMMANDS RELATED set oc3 set oc12 OC 3 DDM 2000 2000 February 2 Issue 11 229 ...
Страница 1071: ...SET PASSWD 4 of 4 Page SET PASSWD COMMANDS RELATED rtrv lgn set lgn set secu OC 3 DDM 2000 2000 February 2 Issue 11 401 ...
Страница 1134: ...SET SYNC 8 of 8 Page SET SYNC COMMANDS RELATED rtrv sync set oc3 set oc12 switch sync 11 464 2000 February 2 Issue OC 3 DDM 2000 ...
Страница 1195: ... Ctl T TOGGLE 2 of 2 Page Ctl T TOGGLE COMMANDS RELATED logout rlgn OC 3 DDM 2000 2000 February 2 Issue 11 525 ...
Страница 1252: ...11 582 2000 February 2 Issue OC 3 DDM 2000 ...
Страница 1254: ...A ii Issue 3 June 2001 Table of Contents ...
Страница 1276: ...363 206 285 A SONET Overview A 22 Issue 3 June 2001 ...
Страница 1313: ...363 206 285 Issue 3 June 2001 DDM 2000 OC 3 Multiplexer TARP Release 13 and Later User Service Manual TOP Volume II ...
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