LBI-39039B
A-6
E1 Span
E1 refers to the 32-channel digital multiplexed interface standard for digital transmission commonly used in Europe,
and many other countries in the world. An E1 Span is used to provide up to 30 digital trunked channels or lines between
the MD110 and PSTN (CO and/or DID trunks), or between the MD110 and another PBX (TIE trunks). The 2 additional
channels are used for synchronization (channel 0), and a common signaling channel (channel 16). Note that all 30
channels available for digital trunking do not have to be used.
For each E1 Span:
- List the circuit IDs and channel numbers, and indicate how the channels are to be used: CO (Incoming only,
Outgoing only, Bothway), DID, or TIE. Note: A single E1 Span between the MD110 and PSTN can be configured
to provide both common CO and DID trunk service (i.e., several channels used for CO trunks, and several channels
used for DID trunks).
- Indicate which of the following apply:
__ 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)
__ If CO trunk, then: Ground Start or Loop Start
__ PTS (Proceed to Send) type: Wink Start or Tone or Wink+Tone
- Indicate the E1 signaling and line coding which apply:
__ Signaling: TBD
__ Line Coding: TBD
- Indicate the E1 framing format which applies (dependent on CSU):
__ Framing Format: TBD
- For CO trunks, indicate where each incoming trunk group should terminate (DISA, console, extension, hunt group).
Note: A standard Jessica configuration would use DISA termination.
- For DID service, provide the following information:
What is the assigned DID number range? ____________ through ____________
How many digits are being sent by the Central Office? ____________
Should vacant numbers be intercepted? ____________
Where? ____________
- For TIE trunks, list the existing access codes and circuit IDs, and indicate where the TIE lines terminate (location of
outbound terminating end). Provide name and phone number of contact at that location.
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