LBI-39039B
A-4
Analog DID Trunks
DID trunks are a special type of CO trunk used to interconnect from the PSTN, and operate in an incoming-only
mode. These trunks allow callers to dial in directly to a station.
- What is the assigned DID number range? ____________ through ____________
- How many digits are being sent by the Central Office? ____________
- Should vacant numbers be intercepted? ____________
Where? ____________
- 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)
__ PTS (Proceed to Send) type: Wink Start or Delay Dial
Analog TIE Trunks
TIE trunks are used to interconnect to/from another PBX switch. These trunks operate in E&M signaling mode, and
are compatible with either 2-wire (Type I) or 4-wire (Type II) E&M signaling methods.
- Which of the trunks used are Incoming only, which are Outgoing only, and which are Bothway (INC, OUT, BWT)?
- Indicate which of the following apply:
__ 2-wire E&M or 4-wire E&M
__ Forward Line Clearing
__ Backward Line Clearing
__ B-Answer Supervision
__ Dial Pulse or DTMF
__ PTS (Proceed to Send) type: Wink Start or Delay Dial or Tone or Wink+Tone
- List the existing access code(s) and the circuit ID(s).
- Where do TIE lines terminate (location of outbound terminating end)? ____________
Provide name and phone number of contact at that location.
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