363-206-305
Operations Interfaces
6-14
Issue 3 June 2000
If the ACO function has been activated to silence all active audible alarms, then
when a "bump down" occurs the audible alarms remain silent. (That is, the lower
level visual alarm is activated, but the corresponding audible alarm is not re-
activated.) If another alarm occurs while the ACO is active, the highest level
audible alarm is activated even if the new alarm is a lower level condition. (For
example, if a MJ and MN alarm were active and silenced via the ACO and another
MN alarm occurred, the MJ audible alarm would sound.)
TL1/X.25 Interface
6
NOTE:
The FiberReach wideband shelf does not provide a direct X.25 interface.
Access to the X.25 port on a gateway NE is via the DCC.
The DDM-2000 FiberReach Multiplexer supports a TL1 interface via its host
DDM-2000 over the DCC on the OC-1 interface to control and report alarm and
status conditions and PM data to an alarm surveillance OS such as Telcordia
Technologies' NMA operations or Lucent Technologies ITM SNC. The TL1
interface of the DDM-2000 FiberReach Multiplexer provides detailed information
such as identifying specific circuit packs and facilities.
The DDM-2000 FiberReach Multiplexer supports remote and automated
provisioning from a provisioning OS such as Telcordia Technologies' OPS/INE or
Lucent Technologies ITN SNC. (FiberReach Release 4.0 is supported by TEMS.)
The DDM-2000 FiberReach Multiplexer also provides enhanced security.
The TL1 maintenance messages of the DDM-2000 FiberReach Multiplexer are
based on Telcordia Technologies' TR-NWT-000833, Issue 3, Rev. 1, Issue 4,
Supplement 1, and Issue 5, Rev. 1. The TL1 provisioning messages of the DDM-
2000 FiberReach Multiplexer are based on Telcordia Technologies' TR-NWT-
000199, Issue 2, and TA-NWT-000199, Issue 6, Supplement 1.
DDM-2000 or FT-2000 can serve as the TL1/X.25 GNE for DDM-2000 FiberReach
TL1-RNE. ITM SNC or other-vendor NEs such as Tellabs TITAN may also be the
TL1/X.25 GNE for DDM-2000 FiberReach TL1-RNE. DDM-2000 FiberReach
cannot be a TL1/X.25 GNE itself.
The OS can use more than one NE as a GNE to provide redundancy and/or to
distribute TL1 message volume across multiple X.25 links. The TL1/X.25 GNE
serves as a single interface to the OS for the NEs in the same subnetwork. The
TL1/X.25 GNE receives operations information from all the NEs through the DCC
and reports this information, as well as its own information, to the OS. The
operations information is in the form of TL1 messages. Through the GNE, the OS
can send TL1 commands to any NE in the subnetwork. FT-2000 OC-48 Lightwave
Systems can serve as the TL1/X.25 GNE for DDM-2000 NEs, but not vice versa
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