363-206-305
Administration and Provisioning
8-56
Issue 3 June 2000
Locked STS-3c (0x1) Broadband Services
8
Beginning with Release 3.1, a FiberReach with Main slots equipped with 28-type
OC-3 OLIUs will transport STS-3c 0x1 service through 22-type OLIU OC-3
interfaces in its function group.
Beginning with Release 4.0, a FiberReach with Main slots equipped with 29-type
OC-12 OLIUs will transport STS-3c 0x1 service through 22-type OLIU OC-3
interfaces in its function group.
STS-3c path switching does not take place on the DDM-2000 ring; it is executed
elsewhere in the network (e.g., when the ring transports ATM STS-3c traffic path
switching is performed through the external ATM-based router).
Figure 8-11 shows an STS-3c 0x1 application. Each OC-12 node provisions the
same dropped STS-3c time slot as other nodes on the same ring. For different
applications, an OC-12 node can assign the other STS-3cs to different time slots
at different sites. With 0x1 applications the OC-12 ring passes the contents of
these STS-3c time slots between the low-speed OC-3/IS-3 lines and the OC-12
high-speed lines without terminating them or performing path protection switching.
Since the STS-3c traffic is received by the low-speed interfaces and transmitted
as two copies on the OC-12 ring (one clockwise, one counterclockwise), the ring
capacity is limited to the OC-12 line rate.
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