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DSP Tone Detection Modes Table
Table A-2. DSP Tone Detection Modes
Tone Mode
Disabled
Bypass
Fax Relay
Fax Relay/
Modem Bypass
* Modes selected on the CE-to-ATM VCC PVC connection window
DSP2C Module Channel Reduction When Using Fax Relay
Mode
®
1-Port Channelized STS-1e, T1 Format Module User Guide, Issue 1
PacketStar
255-700-184
*
and Associated Processing Performed
Ignores fax tones and modem tones
If a fax tone or modem tone is received, the firmware switches to
G.711 mode (64 Kbps) and bypasses echo cancellation, if enough
bandwidth is available.
If a fax tone is received, the firmware switches to a channel config-
ured for FaxRelayMode and performs fax demodulation / remodula-
tion. If a modem tone is received, the firmware ignores it
If a fax tone is received, the firmware switches to a channel config-
ured for FaxRelayMode and performs fax demodulation / remodula-
tion. If a modem tone is received, the firmware switches to G.711
mode (64 Kbps) and bypasses echo cancellation, if enough band-
width is available.
Table A-3. Channel Reduction Availability Caused by Fax Relay Connections vs.
Voice Processing Connections on a DSP2C Module
Number
of DSPs
Total Connections
for Fax
Assigned for
Relay
Fax Relay
1
4
2
8
3
12
4
16
5
20
6
24
7
28
8
32
9
36
10
40
11
44
Processing Performed
Percent of All DSP
Connections
Assigned for Fax
Relay
3%
6%
9%
13%
16%
19%
22%
†
25%
28%
31%
34%
Chapter A Reference Tables
DSP Tone Detection Modes Table
Remaining Voice
Processing Available
*
Channels
124
120
116
112
108
104
100
96
92
88
84
Release 7.0
A-5
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