NEC ND-71762(E) Types of Network, Type MAIN-SATELLITE Network MAIN-REMOTE/CAMPUS Remarks

GENERAL INFORMATION FOR CCIS

4.1 Types of Network

CCIS networks can be divided into the following types, depending upon the numbering plan used: Main-Satellite Networks

Main-Remote/Campus Networks

Both networks provide uniformity of services throughout the CCIS network, and, because of numbering plan flex- ibility, station users are not conscious of the distance between nodes.

Main/Satellite Network:

In this type of network, offices are connected by means of a numbering plan consisting of a three-digit office code, which denotes the location, and four-digit station numbers. An example of a Main/Satellite Network is shown in Figure 2-6.

Main-Remote/Campus Network:

In these types of networks, offices are connected by means of a numbering plan consisting of four or five digit station numbers. The first one or two digit(s) of these station numbers are used to denote the location. An example of a Main-Campus Network is shown in Figure 2-7. Figure 2-8 shows an example of a Main-Remote Network. In this network, a part of the Main Office is installed as a Remote Office at a nearby site, either within or outside the pre- mises of the Main Office. An advantage of this network is that it requires far less cabling than would be necessary if stations were connected to a single PBX. Network numbering specifications are summarized in Table 2-2.

Table 2-2 Network Specifications

TYPE OF	MAIN-SATELLITE NETWORK					MAIN-REMOTE/CAMPUS				REMARKS
NETWORK:						NETWORK
NUMBERING	Office Code: Three digits					Office Code: First one or two digits of
PLAN:						Station Number.
	Sta. No.:Four digits					Sta. No.: Max. five digits
ACCESS		8-XXX-XXXX					XXXXX
METHOD									Sta. No.
					Sta. No.
				Office Code				Office Code
			Access Code
NETWORK	Large					Small (PBX Premises)/
SIZE:	(Nationwide)					Medium (Local Area)

CHAPTER 2 ND-71762 (E)

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Issue 2