Specifications

Operating Modes
2-3
Main Channel Interruption
Main channel interruption is the one significant effect interruptive diagnostics has on
network operation. Because the unit blocks main channel traffic, you will have to take
the necessary precautions to ensure the minimal impact on your network operations when
interruptive diagnostics are being used.
Non-Interruptive Secondary Channel (DDS-SC)
The Non-Interruptive Secondary Channel (DDS-SC) mode provides an out-of-band
secondary channel supplied by the DDS-SC service. The DDS network allows additional
bandwidth for the secondary channel and does not interrupt primary channel data. When
operating in this mode, the Excalibur Multirate DAP can operate with Milgo's CMS DSU
1500 and CMS DSU 1556 products. The secondary channel can also be used for a
customer application.
The level of compatibility provided with the current CMS DSU 1500 and CMS DSU
1556 products is as follows:
• Primary data transfers between units.
• T7 data transfers between units (once a remote has been selected).
• Loops and Self tests.
• End-to-End test is compatible with the CMS DSU 1556 when the test pattern is
2047. It is not compatible with the CMS DSU 1500.
• RCP feature is not compatible.
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.
The Non-Interruptive Secondary Channel function can be initiated from the front panel of
your local unit or from a CMS network management system.
Note: Either the RCP feature or the CMS network management system can use the
secondary channel. Both should not be active simultaneously.