Nortel T1/SMDI Configuration Manual page 168

CallPilot T1/SMDI interfaces
CallPilot T1 DTMF requirements
DTMF Tone detection
DTMF digits
Dynamic range
Minimum tone duration
Minimum interdigit timing
Maximum interdigit timing
Acceptable twist and frequency
variation
Noise tolerance
Cut through
Talk off
168
Values
0 to 9, *, #, A, B, C, D in accordance
with Bellcore LSSGR Sec. 6 and
ANSI T1.403b-2002
-36 dBm to +3 dBm for each tone
50 milliseconds (ANSI T1.403b-2002)
45 milliseconds (ANSI T1.403b-2002)
3 seconds (ANSI T1.403b-2002)
Meets Bellcore LSSGR Sec. 6 and
EIA 464 requirements
Meets Bellcore LSSGR Sec. 6 and
EIA 464 requirements for Gaussian,
impulse, and power line noise tolerance
Local echo cancellation in permits
100% detection with a >4.5 dB return
loss line
Detects less than 20 digits while
monitoring Bellcore TR-TSY-000763
standard speech tapes (LSSGR
requirements specify detecting no more
than 470 total digits). Detects 0 digits
while monitoring Mitel speech tape
#CM 7291.
Standard 1.13
CallPilot