Specifications

Excalibur Multirate DAP Installation and Operation
5-22
Modify Drop Table
The Modify Drop Table feature allows you to add or remove a remote drop from the
existing poll table of a central unit. This parameter is available only when the service is
set for DDSNI, the Location parameter is set to central, and the Network parameter is set
to multipoint. Any changes to the poll table cause data to be interrupted momentarily
while the central unit resynchronizes the circuit using the unit addresses in the new poll
table.
One's Density
This parameter allows you to ensure that the string of zeros in Milgo aggregate diagnostic
test patterns can not cause more than seven zeros in a row on the DDS link (an error
condition). This parameter is available only when the service is set for DDS-SC and the
DTE rate is set to 56 Kbps. When this parameter is enabled, the DAP forces the
secondary CMS network management T7 channel bit to 1 any time main channel data
contains seven 0 bits. The secondary channel may operate a little slower when this
parameter is enabled.
This feature does not ensure error-free multipoint DDS-SC operation at 56 Kbps (when
one's density coding restrictions apply) as it can not force the secondary channel bit to 1
when an all 0s data byte is being transmitted by another drop. If you can not guarantee
the required one's density (Bell Core TR-NLP 00157) in 56 Kbps multidrop operation,
the network must be provisioned with Clear Channel 64 Kbps capability.
Channel Parameters
The Channel submenu contains the parameters that allow single port units to be
configured for use with DDS networks using Milgo's multiport/multidrop frame
specification. This feature is available only when the service is set for DDSNI and the
Multiport Framing parameter is enabled. When this feature is selected, the unit operates
with the same DDS line rates (9.6, 19.2, and 56 Kbps) and supports the same DTE data
rates as the Excalibur Multiport DAP.
Selecting the DTE Data Rate
To select the DTE data rate for each channel, follow these steps, starting from the
Configuration Mode submenu.