Specifications

2-1
Chapter 2
Operating Modes
Overview
This chapter provides information about each operating mode and how it functions. It
includes a detailed description of secondary channel operation, integral dial operation,
and asynchronous/synchronous conversion.
Interruptive Secondary Channel (Basic DDS)
The Interruptive Secondary Channel (Basic DDS) operating mode provides an
interruptive secondary channel. This feature allows you to perform diagnostics and
Remote Control Panel (RCP) functions on a unit that does not have a dedicated secondary
channel. Data transfer between the DTE and the DDS network is interrupted when the
secondary channel is in use. When operating in this mode, the Excalibur Multirate DAP
can operate with Milgo's CMS DSU RD and CMS 6424 products.
The level of compatibility provided with the current CMS DSU 500 RD, CMS DSU 556
RD, and CMS 6424 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 500 RD when the test pattern
is 511, and is compatible with the CMS 6424. It is not compatible with the CMS
DSU 556 RD.
• RCP feature is not compatible.
The level of compatibility provided with the current DSU 500 RD, DSU 556 RD, and
DSU 6424 products is as follows:
• Primary data transfers between units only.
• T7 data transfer between units is not compatible.
The interruptive secondary channel function can be initiated from the front panel of your
local unit or from a CMS network management system. The only exception is that in a
multipoint configuration, the RCP feature can only be started from the central unit.