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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
LIGHT MEDIUM HEAVY
TERMINALS
TRAFFIC
TRAFFIC
TRAFFIC
20
3/3
4/4
5/5
25
3/4 5/5
6/6
30
4/4 6/5 8/7
40
4/4
6/6 9/8
50
5/4
‘7/6
10/8
60
5/4
8/7
11/9
70
5/5 8/7 12/10
80
6/5
9/7
12/10
100
6/5 10/8 14/12
120
7/6 11/9 16/13
140
7/6
12/10 17/14
160
8/7
13/10 19/15
180
8/7
13/11 20/16
200 9/8
14/12
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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