Paradyne COMSPHERE
3610, Operator'S Manual

Page: 21 / 310

Introduction
1-5 3610-A2-GB91-90 July 1999
Single-Port Async/Sync Support
The Single-Port Async/Sync feature is used to provide
ITU-T V.14 asynchronous-to-synchronous data
conversion capability for the DTE ports. The DSUs at
each end of the circuit must be installed with this option.
When used with the Time Division Multiplexer (TDM)
option, the unit can be configured as a central-site bridge
to provide multipoint partial backup for the circuit.
The asynchronous port speeds will always be the same
as the synchronous port speeds when operating at primary
DSU rates, so the port speeds of 150, 300, 600, and
1800 bps can only be achieved through oversampling. To
oversample, the Async
→
Sync configuration option must
be disabled and the synchronous port rate must be set to a
rate greater than or equal to four times the asynchronous
DTE rate. For example, select 1.2 kbps for the
synchronous port speed if the asynchronous port speed if
the asynchronous port speed is 150 or 300 bps, select
2.4 kbps if it is 600 bps, and 7.2 bps if it is 1800 bps. This
ensures that oversampling will take place.
Point-to-Point Configuration
When operating with the Async
→
Sync configuration
option enabled, a single-port point-to-point circuit can
operate using nondisruptive diagnostics. The control
DSU’s port speed and the tributary DTE port speeds must
be set to the same rate. Figure 1-1
shows this
configuration. Note that the tributary DSUs are configured
as a single port-sharing group.
Figure 1-1. Single-Port Point-to-Point Circuit with Nondisruptive Diagnostics