Specifications

Operating Modes
2-5
Clear Channel 64 Kbps
The Clear Channel 64 Kbps (CC64) mode operates on the Clear Channel 64 Kbps service
offered by ASDS. This service provides 64 Kbps to use for data. An interruptive
secondary channel is provided. When the secondary channel is in use, 57.6 Kbps is
available for data.
Note: The CMS network management system can communicate with the central unit.
Customer Owned Copper Wire (LDM)
When operating over customer owned copper wire, two back-to-back Excalibur Multirate
DAPs provide short-haul point-to-point limited distance communications capabilities.
The secondary channel operation is identical to that for the Non-Interruptive Secondary
Channel (DDS-SC) mode. The secondary channel is not available when the line rate is
set to 64 Kbps.
Clear Secondary Channel
The Excalibur Multirate DAP provides the Clear Secondary Channel feature when the
unit is operating in DDSNI, DDS-SC, LADC, LDM, or C64NI mode. When this feature
is enabled, you can use the secondary channel bandwidth for your own application. All
T7 diagnostic and RCP functions are disabled.
Note: LADC is only available for units equipped with the Model A or C Aggregate
card.
You can use this channel only with asynchronous data protocols. The character format is
one start bit, eight data bits, and two stop bits. The available DTE rates depend on the
service and the DDS line rate as listed in Table 2-2.