CHAPTER 1 GENERAL INFORMATION
– 40 – NWA-008853-001 Rev.3.0
97ch1001.fm
NETWORK STRUCTURE CONSIDERATIONS
Determining System Configuration
The configuration of the network and the number of lines (channels) should be determined, and is depen-
dent on the traffic between each office (PBX). For example, when the traffic between Office A and Office
C is high (as shown in the network of the following figure), Office A and Office C should be connected
by No. 7 CCIS directly.
Network Structuring
Determining Number of No. 7 CCIS Routes
When the system is a Main Office or a Tandem Office, two or more routes to other offices are required.
• The maximum number of No. 7 CCIS routes is 8 per system.
Determining Type of Transmission Lines
The type of transmission lines available with the PBX are:
• Digital Interface (24DTI/30DTI)
• Analog Interface (LDT/ODT)
The Analog Interface is not suitable for a high-traffic network because the transmission speed of the con-
trol signal is limited to a maximum of 9.6 Kbits per second (bps). A Digital Interface can transmit control
signals at up to 56 Kbps.
A
B
C
D
NO. 7 CCIS
A/B/C/D: Office (PBX)
NETWORK STRUCTURE CONSIDERATIONS
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