Starplus Triad Xts Digital Key Telephone System System Programming And Operation Manual

General DescriptionC-3
Appendix C - Networking Systems
General Description
Networked telephone switches can be installed in one building or miles apart; however, each 
call appears as though it is an intercom call. The use of ISDN, specifically Primary Rate 
Interface (PRI), is used to create a star topology which has a “Hub” as a central point 
connecting to as many as five “Node” switches. The Hub system is capable of interfacing one 
centralized voice mail that can easily be accessed by each node...

C-4General 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...

Designing a NetworkC-5
Appendix C - Networking Systems
Designing a Network 
When more than one telephone switch is connected together, it is considered a network in 
its simplest form. One system is considered the Main or Hub system (NT). The other is the 
secondary or Node System (TE). There can only be one Hub (NT) and it cannot be attached 
directly to another Hub (NT). Therefore, a Hub can only be connected to a node (TE). Similarly, 
a node (TE) can only be connected to a Hub (NT) and it cannot be...

C-6Designing a Network
Appendix C - Networking Systems
If a match is not found, the system continues checking the next entry of the networking table 
until a match is found or until it has examined each entry. If a match is not found within any 
of the entries, an error tone sounds.
Each Network has its own “line group”, which is its address. For example, Ta b l e C - 1   shows 
that a call to extension 3500 will ring the switch that is connected in line group 2.
The top portion (system configurations)...

Network InstallationC-7
Appendix C - Networking Systems
Extension Numbering
Valid extension range numbering is between 1000 and 8999. Numbering conflicts must be 
avoided. For example, if stations 100, 200, and 300 exist, the numbers 1000, 2000, and 3000 
are conflicts. This is because the system detects the first three digits as validly assigned. 
Therefore, the system is not prepared to accept a fourth digit.
Feature Code Numbering
Feature codes must be unique numbers that pose no conflicts. Therefore,...

C-8Network Installation
Appendix C - Networking Systems
Figure C-2: PRI Connector
ISDN and T-1 Clocking
When using PRIB or T-1 cards in one KSU, specific settings are important for proper clocking. 
Popping, crackling, dropped calls, and one-way transmission are usually attributed to the 
clocking not being synchronized correctly.
It is preferable to use a TELCO PRI to establish clocking for the Network (Figure C-4 ). If no 
TELCO PRI or T-1 is available, then clocking will be controlled by the Hub...

Network InstallationC-9
Appendix C - Networking Systems
The following figures use a  symbol to represent the clock switch position on a PRI or T1 
card. When the top of the symbol is black, it represents the switch in the Up or Enable 
position. When the bottom of the symbol is black, it represents the switch in the Down or 
Disable position.
Figure C-3: Point-to-Point PRIs
Figure C-4: TELCO PRI Connection to the Hub
External Clock Setting:Hub
Node 
Up = Enable Clock
Down = Disable Clock
(Clock Source)...

C-10Network Installation
Appendix C - Networking Systems
Figure C-5: No TELCO Connection
Figure C-6: TELCO PRI Connection To a Node
Hub
Node 
Node 
(Clock Source)
External Clock Setting:
Up = Enable Clock
Down = Disable Clock
Hub
Node 
Node 
TELCO
PRI
(Clock Source)
External Clock Setting:
Up = Enable Clock
Down = Disable ClockNote: The horizontal arrow
represents Out-to-In Cabling.  

Network InstallationC-11
Appendix C - Networking Systems
Figure C-7: All Systems have TELCO PRI Connection
Figure C-8: All Systems have TELCO T1 Connection
Hub
Node 
Node 
TELCO
PRI
TELCO
PRI TELCO
PRI
(Clock Source)
External Clock Setting:
Up = Enable Clock
Down = Disable ClockNote: The horizontal arrow
represents Out-to-In Cabling. 
Hub
Node 
Node 
TELCO
T1
TELCO
T1 TELCO
T1
(Clock Source)
External Clock Setting:
Up = Enable Clock
Down = Disable ClockNote: The horizontal arrow
represents Out-to-In...

C-12Network Installation
Appendix C - Networking Systems
Figure C-9: Two PRIs from TELCO to Nodes
Figure C-10: Two T1s in Hub Connected to PRI in Nodes
Hub
Node 
Node 
TELCO
PRI
(Clock Source)
External Clock Setting:
Up = Enable Clock
Down = Disable ClockNote: The horizontal arrow
represents Out-to-In Cabling. 
Hub
Node 
Node 
TELCO
T1
(Clock Source)
External Clock Setting:
Up = Enable Clock
Down = Disable ClockNote: The horizontal arrow
represents Out-to-In Cabling.