363-206-285
System Introduction
Issue 3 June 2001
1-7
Release 6.0 supports linear applications with new features that include OC-3/
OC-12 interworking using the open systems interconnection (OSI) 7-layer
protocol stack over the data communications channel (DCC). The OSI 7-layer
protocol stack refers to the OSI reference model, a logical structure for network
operations standardized by the international standards organization (ISO). This
OC-3c transport feature is used to interface with broadband terminals.
Release 6.0 includes one new circuit pack (and associated software): the BBG6
STS1E which provides a high-speed or low-speed EC-1 interface. The STS1E
circuit packs are used in the Function Unit slots for EC-1 electrical multiplexer
(high-speed) or EC-1 low-speed applications. The optional VT1.5 performance
monitoring (PM) feature provides the PM of the V5 byte for errored seconds (ES),
severely errored seconds (SES), and unavailable seconds (UAS). The optional
DS1 PM feature allows measuring of near-end performance and the 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. Enhanced security
features include additional logins. The TL1 message-based interface, introduced
in Release 2.0 and enhanced in subsequent releases, for centralized surveillance
by NMA systems is enhanced in this release to allow Telcordia’s OPS/INE system
to provide centralized flow through provisioning of ports and cross-connections.
Release 6.2 replaces Release 6.1 and includes linear optical extensions from an
OC-3 ring and an automatic synchronization reconfiguration feature. Automatic
synchronization reconfiguration provides the ability to automatically select another
synchronization source and to automatically reconfigure the synchronization
provisioning in the event of a synchronization source failure or a synchronization
change in the network, for example, a fiber cut. The feature can be enabled or
disabled. Additional TL1 messages support provisioning, maintenance, testing,
PM, and security functions.
Release 6.2 includes
SLC
-2000 Release 3.1 and 3.2 interworking and channel
state provisioning. Channel state provisioning is a capability provided on
DDM-2000 Multiplexers that suppresses reporting of alarms and events during
provisioning by supporting multiple states (automatic, in-service, and not-
monitored) for VT1.5 and STS-1 channels.
Release 7.0 is an enhanced ring release. Release 7.0 supports a "drop and
continue" feature which is used with DRI applications and an automatic
synchronization reconfiguration feature. Release 7.0 features include two new
plug-ins (and associated software): the 22D-U and the 22G-U OLIUs. The 22D-U
OLIU provides a short-reach IS-3 with TSI optical interface between colocated
OC-3 and OC-12 and
SLC
-2000 ring shelves. The 22G-U OLIU has the same
functionality of the 22F OLIU but with a 23 dB outside plant loss budget allowing
for spans of up to 51 km. The 22D-U and 22G-U OLIUs support signal degrade
protection switching. The "U" designation for the 22D-U and 22G-U OLIUs means
the OLIUs have universal optical connectors. These OLIUs have adapters that
allow the use of
ST
â
, SC, or FC connectors on the faceplates. The 22D-U and
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