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Regulatory Notices
C-15
Call Attempt Minimum duration between call attempts for call
pattern
Attempts ABCD
Initial attempt 5S 5S 5S 5S
1st repeat attempt 1 min 2 min 10 min 3 min
2nd repeat attempt 1 min 2 min 10 min 3 min
3rd repeat attempt 1 min 2 min 10 min 3 min
4th repeat attempt End of sequence
(Note 1) 2 min 10 min 3 min
6th repeat attempt 2 min 10 min 3 min
End of sequence
7th repeat attempt (Note 1) 10 min 3 min
nth repeat attempt 10 min 3 min
(note 2) (note 2)
Note 1: The maximum number of calls for repeat attempt call pattern A is 5 and for call
pattern B is 7.
Note 2: No limit is specified for n.
Note 3: The duration given in table 3 are from cleardown to reseizure.
Extracts from BS6789:Section 3.1:1985 are reproduced with permission of BSL. Complete
copies of the standard can be obtained by mail from BSI Sales.
Use as an Extension on an Approved PABX
Xircom cannot guarantee that this modem will operate correctly under all possible
conditions when connected to compatible PABX equipment. Any cases of difficulty should
be reported directly to Xircom.
This modem may not be connected to PABX systems which do not have a BT431A
compatible socket connection.
Bell Noise
This apparatus does not incorporate circuitry to suppress bell-tinkle during dialing. It has
been found that when used with some electronic ring type telephones and on two wire
circuits that bell tinkle will occur during dialing. This is not a fault and we advise you not to
call the Fault repair service.