Norstar DR5, Руководство по установке

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80 Port numbering
The Numbering Plan follows specific rules such as:
Internal numbers can have up to seven digits.
All internal numbers must have the same number of digits.
Line pool access codes are one to four digits, and cannot
start with the same number as:
the first digit of any internal number
the first digit of any Received number
the Park prefix
the Direct-dial digit
The digit may be assigned to a telephone. If this is the
case, no internal number or Call Park Retrieval code can
begin with “0”.
The same sequence of digits cannot be used for two internal
numbers, for two line pool access codes, or for both an
internal number and a line pool access code. All codes and
numbers must be unique.
Symbols such as an asterisk (*) or a pound sign cannot
be used in internal numbers or line pool access codes.
Key Service Unit (KSU)
The Key Service Unit (KSU) has 8 lines and 24 telephones.
In the charts on the following page, notice that the KSU has two
internal ports, KSU and KSU KSU handles telephones.
KSU handles lines.
Two-port Expansion Cartridge
One or two DS-30 cables for Trunk Modules and/or Station
Modules can be plugged into a Two-port Expansion Cartridge.
Six-port Expansion Cartridge
A combination of up to six Trunk Modules and/or Station Modules
can be plugged into a Six-port Expansion Cartridge.
Modular DR5 Installer Guide