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 |
|
|
|
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Notes:
1 . F o r s y s t e m s w i t h b o t h o n e - w a y a n d t w o - w a y trunks, t h e f i r s t n u m b e r l i s t e d u n d e r “Calling Traffic” is the number of
2.For systems with just
