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System Introduction
1-6 Issue 3 June 2001
DDM-2000 OC-3 Multiplexer Releases 1
Release Descriptions 1
The following paragraphs provide brief descriptions of the DDM-2000 OC-3
Multiplexer releases.
Release 2 and later features allow additional circuit pack configurations to activate
hubbing and STS-1 linear drop applications. The TL1 message-based interface to
Telecordia Technologies Network Monitoring and Analysis (NMA) operations
system feature comes as part of the controller hardware and software which must
always be furnished separately with Release 2 and later equipment.
Release 3.2 features include two new circuit packs (and associated software): the
22F intermediate reach optical line interface unit (OLIU), which provides full DS1
and DS3 add/drop capability and the BBF2B TGS circuit pack, which provides
DS1 timing outputs. The DS1 timing output is derived from the OC-3 signal.
Release 3 includes a security feature that offers security against unauthorized
access to the CIT system functions. Logins, passwords, and user categories are
provided. Security can be enabled or disabled.
Release 5.1 supersedes Release 5.0 (from this release on, odd feature numbers
are for ring releases while even feature numbers are for linear releases) and is a
two-fiber, virtual tributary (VT) path switched, ring release that requires the use of
22F OLIUs in the Main-1 and Main-2 slots of all shelves in the ring. Time slots
must be reserved all the way around the ring limiting the ring capacity to 84 DS1s.
The ring interfaces include DS1 low-speed, DS3 with STS-1 path protection
switching and cross-connections, EC-1 low-speed with VT1.5 or STS-1 based
cross-connections, or mixed DS1, DS3, and EC-1 interfaces with a total capacity
not exceeding the OC-3 bandwidth.
Release 5.1 features include two new circuit packs (and associated software): the
BBF3 DS1PM which provides DS1 performance monitoring and the BBG6 STS1E
(EC-1) provisioned for low-speed operation. The DS1PM can be mixed with the
DS1 circuit packs in the Low-Speed Group slots. The optional DS1 PM feature
allows measuring of near-end performance and the extended superframe (ESF)
far-end performance report of the incoming DS1 signal. This allows the service
provider to determine the end-to-end performance of the DS1 signal. SONET
synchronization messaging is used to communicate the quality of network timing,
internal timing status, and timing states throughout a subnetwork.
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