Specifications

Introduction
1-9
Asynchronous/Synchronous Conversion
The Excalibur Multirate DAP can be set to operate with asynchronous or synchronous
DTEs. When operating with asynchronous DTEs, the DAP converts the data into a
synchronous format using the method specified in CCITT Recommendation V.14. The
converter protects against data loss by compensating for small data rate differences
between the DTE and the DAP.
CMS DSU Compatibility
The Excalibur Multirate DAP can operate with Milgo's CMS DSU products.
Compatibility is provided for primary data transfers between units, T7 transfers between
units, and for Loops and Self-Test.
Multiport Frame Compatibility
The Excalibur Multirate DAP can be connected to a multidrop network made up of
Excalibur Multiport DAPs, and can interface to any one channel in the aggregate data
stream. The unit can operate as a multidrop central or remote. It operates with the same
DDS line rates and supports the same DTE data rates as the Excalibur Multiport DAP.
This feature is available when the DAP is operating with the non-interruptive secondary
channel technology on Basic DDS service.
CMS Compatibility
For those networks that require comprehensive management, testing, and control
features, the Excalibur Multirate DAP can operate with Milgo's CMS network
management systems. A CMS system provides the following capabilities:
• Line Quality Statistics (LQS) - allows you to measure and graphically display the
quality of a transmission line from your central site console. LQS measures the
following line availability statistics: percentage of time transmit levels, receive
levels, and signal quality are within predefined thresholds; percentage of time the
DDS circuit is available for use; percentage of time the DAP is receiving a valid
signal from the network; number of Out of Service codes, Abnormal Station
codes, network framing errors, and unknown control codes received; number of
multiport/multidrop resynchronizations for each drop and total number of
multiport/multidrop resynchronizations; number of times the central DAP has
resynchronized the entire network (global resync count); number of seconds
receive line fault conditions and active network service loops occur.
• Database management - provides you with a complete record of your network's
structure, including all sites, components, and channels. A network map display
is available as a visual aid when troubleshooting large networks.