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February 10, 2009
Tandem Overflow from Direct End Office Trunks
Direct End Office Trunks (DEOTs) are more economical than paying for traffic to route through a tandem office. Tandem switching, tandem trunk terminations and tandem transport charges are avoided if calls are routed instead to Direct End Office trunks. The average minutes of use per month carried over a DS1 (24 channel) DEOT is about 230,000 MOU per month, with a high of around 280,000 MOU and a low of around 165,000 MOU. DS1 DEOTs are economical with as few as 110,000 MOU per month to an end office, depending on the cost of a DS1 DEOT versus tandem switching charges.
DEOTs carry more or less traffic in a month depending on whether traffic is relatively even throughout the month, or if it peaks at different times of the month. If an end office serves an optimum mixture of Business customers (use the network during the day) and Residential customers (use the network in the evenings), then the DEOT will carry more MOU per month than an office lacking Bus/Res balance.
All traffic in and out of Host – Remote clusters transports through the Host office. So, the overflow traffic could look excessive for the Host office by itself, but look reasonable when the usage for the Remote offices is added to the total.
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