363-206-295
Transmission and Synchronization Interfaces
5-24
Issue 1
December 1997
For DDM-2000 OC-3, function unit C, when equipped with an OC-3/IS-3 OLIU,
can be selected as an option for automatic synchronization reconfiguration. This
is useful in DRI networks where an OC-3 ring is connected through an OC-3/IS-3
optical interface to an OC-12 or FT-2000 OC-48 Lightwave System ring.
In OC-12 Release 5.1 and later ring releases, the sending of DS1 AIS on the
output of the BBF2B/BBF4 circuit pack can be provisioned by using the
set-
sync
command. Depending on the quality level of the incoming sync messages,
this new parameter can be provisioned to send DS1 AIS upon receiving level 5
(default), level 4, level 3, or level 2. Refer to Table 5-3 and Table 5-4 for definitions
of quality levels. AIS will be sent as long as the received message is at the
provisioned or greater in quality level number.
Examples
5
In this part, some detailed examples are given to show specifically how the
synchronization messages propagate through the DDM-2000 network and assist
in the recovery from a fiber failure. Through these examples, one can extend the
same concept to any other network that may include different topologies, number
of sites, failure locations, and number of BITS clocks.
NOTE:
All nodes in a ring using automatic synchronization reconfiguration must
have the synchronization messaging and automatic synchronization
reconfiguration features enabled to prevent alarms.
In all of the following examples, if the sync message parameter within the
set-oc3
or
set-oc12
commands has been provisioned to “S byte” for an optical
interface, then the equivalent quality level S byte message will be transmitted from
that optical interface. The following are equivalent messages:
K2: Sync Quality Unknown is the same as, S1: Sync Trace Unknown
K2: Timing Looped Back is the same as, S1: Don’t Use
K2: Internal Clock is the same as, S1: Traceable SONET minimum Clock
K2: Stratum 3 is the same as, S1: Traceable Stratum 3.
Synchronization Reconfiguration Using an Externally Timed Access
Ring
5
Figure 5-9a shows an externally timed access ring operating in its normal
configuration. The DDM-2000 OC-3/OC-12 Multiplexer at the CO (Site A) is
externally timed from a BITS clock referenced to a PRS traceable source (host
node). The remaining DDM-2000 OC-3/OC-12 Multiplexers are externally timed
from a BITS clock referenced to a derived DS1.
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 ...