9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. IV-7-87
The NMS option is not supported by the 9500 MXC Terminals.
AUX Transport on Link Overhead and Operating Rules
• The link overhead supports 9500 MXC NMS, radio-radio handshaking (such as
ATPC), and auxiliary data.
• Auxiliary data is allocated to individual 64 kbps circuits (up to six for the
INU/INUe, one for the IDUs) in the overhead. 64 kbps channeling is used
regardless of the async/sync selection.
• When auxiliary data is not being transported, the full overhead capacity is
available for NMS to get best possible NMS throughput speed.
• The overhead is provided on RAC (radio) and DAC 155oM (fiber) plug-ins (the
two types which can be used to provide linking), and on the IDUs.
• The overhead supports a capacity of 512 kbps, with two exceptions:
• DAC 155oM has two NMS transport options: RSOH (Radio Section
Overhead) and MSOH (Multiplexer Section Overhead). RSOH limits the
overhead to 192 kbps. MSOH provides 512 kbps.
• For 4xDS1, QPSK, the overhead is limited to 256 kbps.
• Rules governing the use of the overhead for an INU/INUe link are:
• 9500 MXC NMS transport requires a minimum 128 kbps.
• Overhead capacity is reduced in 64 kbps steps (down to the 128 kbps
minimum) for each data channel configured.
• For a 512 kbps overhead this means up to six, 64 kbps auxiliary data circuits
can be accommodated above the NMS minimum of 128 kbps (512 less 128
kbps).
• For a 192 kbps overhead (DAC 155oM with RSOH) just one 64 kbps data
circuit can be accommodated. Similarly, for a 4xDS1, QPSK configuration
only two 64 kbps data circuits are possible within the 256 kbps overhead.
• The 64 kbps data circuit allocation must start at port 1 to avoid unnecessary
overhead capacity reduction for NMS transport. Allocation is configured in
the Auxiliary Circuits screen. Refer to Circuits Configuration - Auxiliary on
page 9-14.
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