Type of Call
Ratio
Trunk
65 percent usage
2.4.5.3
Grade of Service
Provide trunks, switch quantities, and lines with a P.001 grade of service
as indicated on RUS 345-165, Erlang Traffic Table, Lost Calls Cleared.
2.4.6
Numbering Plan
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NOTE: Designer should provide exact numbering plan
requirements, if available. Consult the telephone
company and other providers of service regarding any
current or future plans to change the listed number
and/or future numbering plan for Direct Inward Dial
from the Direct Distance Dialing and Government
networks and for Direct Outward Dial to these
networks.
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Provide a flexible numbering plan that will allow for numbers to be changed
via terminal interface. Numbering plan for the system shall consist of
seven-digit numbers.
2.4.6.1
Dialing Plan
Assign DID stations with seven-digit numbers for public directory lists.
Calls within the system shall be accessed by dialing the last three or four
digits of the listed station number. Calls to stations outside the system
shall be completed by dialing [an access code and then] the published
number, such as four digits for base calls, seven digits for off-base local
calls, FTS, and Autovon, or ten digits for Direct Distance Dialing (DDD)
calls.
2.4.6.2
Translation Functions
System software shall have the capability to prefix at least three digits
or delete at least three digits from the originating and terminating trunk.
2.4.6.3
Subscriber Data Base
Contractor shall gather, develop, and load the subscriber data base.
Assignment of class of service and associated features and capabilities
shall be subject to approval by the Contracting Officer.
2.5
DIRECT DIGITAL INTERFACE
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NOTE: For bulk transmission between two points, use
of multiplex or lightwave terminal equipment may be
necessary. Some EPABX have inherent capability to
transmit and receive multiplexed or optical signals.
If an EPABX transmits a multiplexed digital signal
to anything other than digital switch which
interfaces on a direct digital basis, channel banks
will be required. The fiber optic system specified
in paragraph entitled "Fiber Optic Transmission and
SECTION 16720N
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