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Applications
Issue 1 December 1997 2-33
STS-3c Video Application ATM Interface 2
Figure 2-21 shows the video application for the DDM-2000 OC-12 ring used to
transport STS-3c signals from one ATM switch to another. In this scenario, each
OC-12 shelf is cross-connected and provisioned as COV type. This provides the
capability of transmitting a point-to-point STS-3c video signal from one shelf to
another. Significant features of this application
*
are:
■ Both inner and outer rings (mb1 and mb2) distribute up to four STS-3c
unprotected one-way signals. These signals are then connected to OC-3 or
IS-3 circuit packs.
■ The STS-3c signals can be provisioned in pairs (two, four, six, or eight) and
unused time slots can be used for other ring applications.
Figure 2-21. STS-3c Video Broadcast Application for ATM Interface
* Customer experience with this application has revealed compatibility issues with some
brands of ATM equipment (e.g., Cisco, Bay Network). For ATM support it is strongly
recommended to use the STS-3c 0x1 application features provided in OC-12 Release 5.2
and later ring releases, unless an unprotected scheme is acceptable.
OC-12
OC-12
OC-12
Fn-x-
Fn-x-1
Fn-x-1
Fn-x-1
COV
COV
COV
Fn-x-2
Fn-x-2
COV
OC-12
Note: Low speed interface
in Fn-x can be
OC-3 or IS-3
mb1
mb2
mb2mb2
mb2
mb1
mb1
mb1
Fn-x-2
Fn-x-1
Maximum Capacity =
8 STS-3c Signals
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