Specifications
1-1
Chapter 1
Introduction
Introducing the Excalibur Multirate DAP
The Excalibur
Multirate DAP (Digital Access Product) provides a versatile interface
between your data terminal equipment (DTE) and all the digital data services. Efficient
and economical performance is provided in both point-to-point and multipoint network
configurations. The DAP operates at digital line speeds of 2.4, 4.8, 9.6, 19.2, 56, and 64
Kbps.
DAP control is quick and easy with the Excalibur Multirate DAP's menu-driven front
panel display. Clear English prompts displayed on a 48-character LCD screen guide you
through each operating procedure. To enter a command, simply press the button beneath
the desired menu option.
With the Excalibur Multirate DAP, you can control any remote Excalibur DAP in the
network from the local DAP's front panel. By entering the remote unit's address into the
local DAP, you can perform operating procedures as if you were at that site. This feature
eliminates the need to have trained operators at remote sites.
For even more comprehensive network control, the Excalibur Multirate DAP can operate
with one of Milgo's Communications Management Series (CMS
) network management
systems. A CMS system provides sophisticated data base management, performance
analysis, fault isolation, and network restoral capabilities.
Operating Modes
There are six operating modes for the Excalibur Multirate DAP:
• Interruptive Secondary Channel (Basic DDS
®
) - provides an interruptive
secondary channel for diagnostic testing. Data transfer between the DTE and the
Digital Data Service (DDS) network is interrupted when the secondary channel is
in use.
• Non-Interruptive Secondary Channel (DDS-SC) - provides an out-of-band
secondary channel supplied by the DDS-SC service which can be used as a
noninterruptive secondary channel or as a clear secondary channel for user
applications. The DDS network allows additional bandwidth for the secondary
channel and does not interrupt primary channel data.
• Non-Interruptive Secondary Channel (Basic DDS) - provides a non-interruptive
secondary channel or a clear secondary channel over basic DDS lines in
exchange for a small amount of bandwidth.