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Principles of Operation
4-93610-A2-GB41-60 March 1999
Multipoint Async Compatibility
The control DSU with the Single-Port Async/Sync
feature is compatible with earlier DSU releases that use a
TDM with the ports configured as a single port-sharing
group, as long as the control DSU’s port speed and
port-sharing group port speeds are the same. Earlier DSU
releases from 4.xx to 5.xx can be accommodated as long as
the control DSU’s software version is 6.xx; otherwise, the
units should be returned to the factory to be upgraded.
(Contact your authorized service representative to
arrange for your upgrade.) Figure 4-5 shows a compatible
configuration. Access the Status (Stat) branch and select
ID (Identity) to determine the DSU’s firmware version
(DSU SW ver).
NOTE
For asynchronous ports to
operate at 1200 bps, individual
asynchronous port speeds
(Async Rate) for both the control
and tributary DSUs must be set
to =Sync when the port’s
Single-Port Async/Sync
capability is enabled
(Async→Sync: Enab).
Figure 4-5. Multipoint Async-Compatible Network