C-4 General Description
Appendix C - Networking Systems
Standards
ISDN
Primary Rate Interface (PRI) Board
Vodavi has created a proprietary ISDN interface that ties two or more Vodavi telephone
systems together using PRI cards. The use of PRI cards allows Vodavi to convert the 24th
channel into a “D” channel. That channel passes the call processing information, while
leaving 23 channels for voice processing.
This PRI must be running error-free prior to attempting any networking of systems.
Each Node site requires a link to the Hub site using ”Star-type” topography (refer to
Figure C-1: Network Configuration Diagram). The maximum number of connections possible in
the XTS is ten. A call will not hop more than twice (go through more than two switches)
before reaching its destination. If a centralized voice mail is in the configuration, it will be
installed at the Hub.
Figure C-1: Network Configuration Diagram
Terminal Emulation (TE) and Node Transmission (NT) are explained in Designing a Network.
If KSUs are more than 50 feet apart or they are in different buildings, a CSU is required
at both ends. If KSUs are less than 50 feet apart and they are in the same building,
CSUs are not required.
In a DSU/CSU, the 24th channel must be identified as a “D” (data) channel.
TE
Node
Voice
Mail
NT
Hub
TE
Node
TE
Node
TE
Node
TE
Node
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