Telos TWOx12 - Page 162

TELOS TWOX12 USER’S MANUAL
TECHNICAL DATA & TROUBLESHOOTING
CHAPTER 8 150
Accepting Call TWOx12 has accepted an incoming call and is waiting for the Telco
switch to connect it.
Connected All signaling is complete - the voice channel is available for use.
One caveat regarding the Ready indication: If you have this indication with the TWOx12’s
Telco mode set to AT&T 5ESS and you cannot dial, it is likely that your line is Natl. I-1 or
DMS-100. The AT&T 5ESS protocol does not require SPIDs, so the TWOx12 does not send
or check them; it just assumes the line is OK in this regard, so it gives the Ready indication,
though the line is waiting for the SPIDs.
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IMPORTANT!
It is normal for ETS300 lines to go to Deactivated when not used. If the system can dial
normally under these circumstances, this indication is not a cause for alarm.
Is the problem only with one BRI circuit or does it move when you switch lines around?
If the problem remains with the line, then call your Telco. On the other hand, if a line that
works in one interface fails to work in another interface of the same TWOx12 then you have
an problem with your ISDN interface card (or possibly elsewhere in the TWOx12).
Are you using the TWOx12’s internal NT1 ?
(USA & Canada only)
The LED indicator of the status of the ISDN connection is on the rear panel near each of the
the U jacks. If the circuit is inactive, the LED will remain in the rapidly flashing state. This
state indicates a loss of the ISDN BRI circuit at the lowest (physical) level. Try another line
cord or try another line in this interface connector.
If the NT1 can contact the central office, the LED will blink slowly (about 1 Hz). If the LED
remains in this state there is an internal ISDN problem or you could be connected to the
wrong jack on the back (Users in USA & Canada should be using the lower, RJ11 style jack).
The LED will come on solid when all handshaking is completed and the basic (low level) line
connection is good.
If the LED stays on, with the ISDN disconnected, or does not come on at all, there is a
hardware problem.
Condition: System says Ready but attempted calls do not complete (goes back to Ready
or sits at Waiting)
Are your SPIDs and Telco setting correct?
Can you dial from Line 1 to Line 2?
If you can successfully call from one line to the other, you know that your SPIDs and ISDN