Instruction manual

TECHNICAL SPECIFICATIONS
Recommended Central Office Trunk Facilities
The following table provides recommendations for CO trunks based on the number of voice
terminals in the system and the calling traffic.
CALLING TRAFFIC
VOICE
TERMINALS
20
25
30
40
50
60
70
80
100
120
140
160
180
200
LIGHT
TRAFFIC
3/3
3/4
4/4
4/4
5/4
5/4
5/5
6/5
6/5
7/6
7/6
8/7
8/7
9/8
MEDIUM
TRAFFIC
4/4
5/5
6/5
6/6
7/6
8/7
8/7
9/7
10/8
11/9
12/10
13/10
13/11
14/12
HEAVY
TRAFFIC
5/5
6/6
8/7
9/8
10/8
11/9
12/10
12/10
14/12
16/13
17/14
19/15
20/16
22/18
Notes:
1. For systems with both one-way and two-way
trunks, the first number listed under “Calling Traffic”
is the number of two-way trunks required, the second
number is the number of one-way trunks required.
2. For systems with just two-way trunks, add the two
numbers listed under Calling Traffic to determine the
number of trunks required.
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