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Applications
2-34 Issue 1 December 1997
Locked STS-3c (0x1) Broadband Services 2
Beginning with Release 5.2 the DDM-2000 OC-12 ring will transport STS-3c 0x1
services through OC-3/IS-3 interfaces in its function units. These interfaces must be
provisioned as 0x1.
STS-3c path switching does not take place on the DDM-2000 OC-12 ring; it is
executed elsewhere in the network (e.g., when the OC-12 ring transports ATM STS-3c
traffic path switching is performed through the external ATM-based router).
Figure 2-22 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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