363-206-295
System Introduction
1-4
Issue 1
December 1997
Channel state provisioning is a capability provided on DDM-2000 OC-12
Multiplexers that suppresses reporting of alarms and events by supporting
multiple states (automatic [AUTO], in-service [IS], and not monitored [NMON]) for
STS-1 channels.
Release 2.3 provides OC-3 line state provisioning in addition to the features of
Release 2.2. Line state provisioning allows in-service and not-monitored states of
OC-3 line level alarms on Function Unit OLIUs. The alarms can be squelched and
removed from the alarm report. Used in one-way OC-3c transport on OC-12 video
applications.
Release 3.0 is an OC-12 STS-1 path switched ring release featuring EC-1 dual
ring interworking (DRI) with drop and continue and automatic synchronization
reconfiguration. New applications include OC-12 path switched ring, DDM-2000
OC-12/DACS IV-2000 transmission interworking, and DRI interworking via an
EC-1 interface. New features include DS3 low-speed interface on an OC-12 path
switched ring, EC-1 low-speed interface with the BBG12 3STS1E circuit pack,
two-fiber path switched ring, ten network elements’ maximum network from a
single maintenance point, STS-1 drop and continue, nonrevertive protection
switching, automatic ring synchronization reconfiguration, OSI 7-layer protocol
stack on the DCC in a ring, DS1 timing outputs for timing distribution,
synchronization messaging, STS-1 signal degrade, manual STS path switching,
enhanced security, remote and remote software download. The new BCP3 time
slot interchange (TSI FLEX) circuit pack provides flexible STS-1 bandwidth
management across the entire OC-12.
Release 3.1 new applications and features include interworking with
SLC-2000
Releases 3.1 and 3.2 ring networks, OC-12 STS-1/VT1.5 path switched ring (ring
0x1 low-speed interface) optical interconnections between DDM-2000 OC-3 and
OC-12 ring shelves (OC-3/IS-3), enhanced DS3 PM, channel state provisioning,
OC-3 ring to OC-12 ring in-service upgrades, low-speed EC-1 loopbacks, and
additional TL1 commands and enhancements.
The OC-12 STS-1/VT1.5 path switched ring (ring 0x1 low-speed interface) OC-3/
IS-3 interface offers a significant advantage over the 1+1 protected OC-3/IS-3
interface for VT1.5 path switched ring applications. Ring (0x1) low-speed interface
means two service lines (no protection lines) are used between the OC-12
Multiplexer ring and the OC-3 Multiplexer ring.
Ring 0x1 low-speed interfaces provide full VT protection switching via an OC-12
ring, bandwidth conservation, and VT bandwidth management on the OC-12 ring.
Enhanced DS3 PM provides a collection (from the fiber or high-speed interface) of
the DS3 parity-bit (P-Bit) and frame and multiframe (F&M) bit errored seconds,
severely errored seconds, and unavailable seconds to the already provided
coding violations and severely errored frame seconds. The feature is mainly used
for DS3 tariff verification.
