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250 2.0 Mb DTI implementation
Prompt Response Description
MFAO YES (NO)
<CR>
DTI card will or will not set bit 3 of timeslot 0 if loss of
Multiframe Alignment Signal (MFAS) occurs.
2.0 Mb DTI default = NO
<cr> = no change is required
SZNI YES (NO) PSTN incoming seizure during lockout of MFAS and far-end
fault states allowed (denied)
MFF CRC
(AFF)
Multiframe format - Cyclic Redundancy Check (CRC 4)
Alternative Frame Format
Note: Prompted for Small Systems.
The following prompts and associated responses define the grade of service
timers for the DTI card. Group I problems are treated individually. They are
bipolar violations, bit error rate (frame alignment) slips, and CRC-4 errors.
Group II problems are treated as a group. They are bit 3 of TS0 (far-end
out of service), bit 6 of TS16 (far-end lost multiframe alignment), AIS (alarm
indication signal), loss of frame alignment, and loss of multiframe alignment.
Responses are interpreted as follows:
•
mt = Maintenance threshold time.
•
ct = New call suppression (hardware service removal) threshold time.
•
ot = Out of service threshold time.
•
dt = No new data calls suppression threshold time.
Each of the response times are expressed as follows:
•
nnnY = time in milliseconds where nnnn = 20-5000 (input to nearest
20 milliseconds.)
•
nnnS = time in seconds where nnn = 1-240
•
nnnM = time in minutes where nnn = 1-240
•
nnH = time in hours where nn = 1-24
Nortel Communication Server 1000
ISDN Primary Rate Interface Installation and Commissioning
NN43001-301 02.03 Standard
Release 5.5 7 December 2007
Copyright © 2003-2007, Nortel Networks
.