1.4 SYSTEM CAPACITIES AND COMPONENTS
1.4.1
System Capacities
The maximum capacities of the system are tabulated below:-
Total Exchange Lines
8
Common Exchange Lines
6
Exclusive Lines
8 (Note)
Intercom Links
3
Monitor Links
1
Stations
16
Note:
Any exchange line can be assigned as an exclusive line, up to the maximum of 8 lines.
Refer to Appendix for further information.
Call Metering Unit
The unit contains three metering circuits with digital displays. Any number of units may be used to cater for the
exchange lines connected to the system.
Tie Line Unit
The unit has a capacity to provide two interface circuits for any combination of ring in/ring out or loop in/ring out
tie lines. Any number of
up to the maximum number of exchange lines can be used.
Two-Wire Extender Unit
The unit provides a power supply to the
boards so that the standard telephone station may be used
with line loops up to 1500 ohms. One unit is required per
board.
Ring Generator Unit
The unit provides ring voltage for signalling to two-wire telephone stations. One unit provides ring for one
board.
1.4.2
System Limits
ITEM
SPECIFICATION
Max. Loop Limits :
System Stations
52 ohms
cable)
Two-wire Extensions
300 ohms
cable)
with two-wire extender
1500 ohms
cable)
unit.
External Music Inputs
Input Impedance
Required Input Level
External Page Output
Output Impedance
Output Level
Power Requirements
AC Mains Voltage
Max. Power Dissipation
Operating Temperature
System
Stations
Relative Humidity
Weight
Main Equipment
Stations
600 ohm
15
1 kohm
300
Load 1
225 to 270
at
1 6 0 V A
0°C to
0°C to
10% to 95%
11 Kg
Table 1.4.2 SYSTEM LIMITS FOR COMMANDER-AN
22
AN-61 6
ISSUE 1