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C-14 INSTALLING INTEL TELEPHONY COMPONENTS
Troubleshooting Robbed Bit T1 problems ____________________
This section provides information about the following problems:
Obtaining details about your T1 span. See page C-14.
DID numbers stop working after changes to a Robbed Bit T1 line. See page C-15.
Obtaining details about your T1 span
TeleVantage supports Robbed Bit T1 spans. These installations often require significant
configuration work because of the nature of Robbed Bit protocols. It is critical to have the right
signaling information for your T1 span. The following questions should be submitted to your T1
carrier so that you have the correct information.
It is important that you speak with a switch technician when you call your carrier.
Incoming calls.
What are the A and B bits set to when you receive an incoming call?
Line drop.
What are the A and B bits set to when the caller hangs up?
Inbound pickup.
What do I have to set the A and B bits to in order to seize the line when an incoming
call is detected?
Does the CO respond by sending back additional signals? If Yes, what are the line’s
A and B values set to?
Do I have to respond again with another bit signal? If Yes, what is it?
Outbound pickup.
What do I have to set the A and B bits to in order to seize the line to place a call?
Does the CO respond by sending back additional signals? If Yes, what are the line’s
A and B values set to?
Do I have to respond again with another bit signal? If Yes, what is it?
Hangup.
What do I have to set A and B bits to in order to hang up the line?
Does the CO respond by sending back additional signals? If Yes, what are the line’s
A and B values set to?
Do I have to respond again with another bit signal? If Yes, what is it?
Initialize.
What are the settings of the line’s A and B bits when the line is idle?