Page100 of 544 Provisioning
553-3011-100 Standard14.00 January 2002
Model 1
Table24, “Digitone receiver (DTR) requirements — Model 1,” on page117
is based on the following factors:
•33 percent intra-office calls, 33 percent incoming calls, and 33 percent
outgoing calls
•1.5 percent dial tone delay grade of service
•no Digitone DID trunks or incoming Digitone tie trunks
Model 2
Table25, “Digitone receiver (DTR) requirements — Model 2,” on page118
is based on the following factors:
•the same traffic pattern as Model 1
•Digitone DID trunks or incoming Digitone tie trunks
•Poisson 0.1 percent blockage grade of service
Model 3
Table26, “Digitone receiver (DTR) requirements — Model 3,” on page119
is based on the following factors:
•15 percent intra-office calls, 28 percent incoming calls, and 56 percent
outgoing calls
•1.5 percent dial tone delay grade of service
•no Digitone DID trunks or incoming Digitone tie trunks
Model 4
Table27, “Digitone receiver (DTR) requirements — Model 4,” on page120
is based on the following factors:
•the same traffic pattern as Model 3
•Digitone DID trunks or incoming Digitone tie trunks
•Poisson 0.1 percent blockage grade of service