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Page 100 of 544 Provisioning
553-3011-100 Standard 14.00 January 2002
Model 1
Table 24, “Digitone receiver (DTR) requirements — Model 1,” on page 117
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
Table 25, “Digitone receiver (DTR) requirements — Model 2,” on page 118
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
Table 26, “Digitone receiver (DTR) requirements — Model 3,” on page 119
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
Table 27, “Digitone receiver (DTR) requirements — Model 4,” on page 120
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