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BRI

BRI

(OP)
I have a ISDN phone that intermittently disconnects a call in progress. It is an 100 ohm device. Does anyone know what the terminating resistance of a TN-556B circuit pack is? Or any ideas? This happens at several locations and at different distances.  

RE: BRI

Hi,
Wich type of Isdn phone do you use? What is line distance from TN556 port (should be in 900 meters range)?
What type of calls is disconnecting- only off-premises or calls to extensions is disconnecting too?
I think that terminating resistor 100 ohm needs only in high theoretical discussions. ( Some Professors may be correct me now. In normal life IMHO you don't need this one.
As an idea for outgoing disconnect problem, try to check system-parameters features for
Off-premises Tone Detect Timeout Interval. It should be 20 seconds or a little more.
I had so kind of problem with BRI video calls wich were disconnected after
20-30 seconds of call in-progress(it was too short tone detect timeout).

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