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Principles of Operation
4-133610-A2-GB41-60 March 1999
Multiplexing and Digital Sharing
When digital sharing is combined with the TDM or
MCMP multiplexing capability, in-band framing must be
taken into account. The TDM circuit card can support up
to two digital-sharing groups, while the MCMP circuit
card can support up to three.
NOTE
Port Speed assignments should
be the same at both the control
and tributary DSUs.
Some of the ports can be configured for multiplexing
(one port per channel) and others can be configured as a
digital-sharing group. For example, two digital-sharing
groups can be multiplexed with the remaining port
forming three channels, as shown in Figure 4-9. The three
channels are designated as A, B, and C in the example.
Framing and/or secondary channel bandwidth can be
taken from any of the multiplexing ports or from the
digital-sharing group. In this example, Port 6 is set to
underspeed. If framing is taken from the digital-sharing
group, every port in the shared group runs at underspeed.
Keep in mind that extended circuits are not possible from
an underspeed port or from any of the ports in a digital
sharing group if the group is running underspeed.
Figure 4-9. Multiplexing and Digital Sharing