JESSICA PBX GATEWAY QUESTIONNAIRE LBI-39039B
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Digital Trunks No. of Trunks/Spans
__ Digital CO (Central Office) Trunk _____
__ Digital DID (Direct Inward Dial) Trunk _____
__ Digital TIE Trunk _____
__ 23B+D PRI (T1 ISDN Span) _____
__ 30B+D PRI (E1 ISDN Span) _____
Note: T1 or E1 TIE trunks are highly recommended for connecting the MD110 to another PBX.
For each of the trunk types used, the information on the following pages is required. Copies of the attached form may be
used to provide this information.
ANALOG TRUNKS
Analog trunk lines can be CO trunks, DID trunks, or TIE trunks.
Analog CO Trunks
CO trunks are used to interconnect to/from the PSTN. These trunks can operate as either Loop Start or Ground Start
circuits; however, Ground Start are preferred.
- Which trunks will be through the switch?
- Which of the trunks used in the switch are Incoming only, which are Outgoing only, and which are Bothway (INC,
OUT, BWT)?
- Are any of the trunks which are to be used through the MD110 Loop Start versus Ground Start? If Loop Start trunks
are used, then it is highly recommended that they be converted to Ground Start prior to cutover.
- Indicate which of the following apply:
__ Ground Start or Loop Start
__ Forward Line Clearing
__ Backward Line Clearing
__ B-Answer Supervision
__ Dial Pulse or DTMF
__ Common Control CO or Step-by-Step (a few older COs still use Step-by-Step switching equipment)
- Which trunk lines are in a hunting arrangement (CO provided) with each other, and in which order?
- Where should each incoming trunk group and individual trunk terminate (DISA, console, extension, hunt group)?
Note: A standard Jessica configuration would use DISA termination.
(Reminder: Need to provide 1 dedicated Loop Start line for the MD110 modem to be used for remote diagnostics
and programming. Phone Number: __________________________ )
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