255-700-447
C-9
PacketStar
®
PSAX 2300 Multiservice Media Gateway User Guide
, Issue 1
Release 9.0.0
Appendix C Reference Information
DSP Tone Detection Modes
DSP Tone Detection Modes
DSP tone detection modes are selected through the Circuit Emulation-to-
ATM VCC PVC Connection
window
. These modes are described in Table C-3.
DSP Channel Reduction Availability Due to Fax Relay Mode
Table C-3. DSP Tone Detection Modes
*
and Associated Processing Performed
Tone Mode
Processing Performed
Disabled
Ignores fax tones and modem tones
Bypass
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.
Fax Relay
If a fax tone is received, the firmware switches to a channel configured for
FaxRelayMode and performs fax demodulation / remodulation. If a modem
tone is received, the firmware ignores it
Fax Relay/Modem
Bypass
If a fax tone is received, the firmware switches to a channel configured for
FaxRelayMode and performs fax demodulation/remodulation. If a modem
tone is received, the firmware switches to G.711 mode (64 Kbps) and
bypasses echo cancellation, if enough bandwidth is available.
*
Modes selected on the
Circuit Emulation-to-ATM VCC PVC Connection
window.
Table C-4. Channel Reduction Availability Caused by Fax Relay Connections vs.
Voice Processing Connections on a DSP2C Module
Number
of DSPs
for Fax
Relay
Total Connections
Assigned for
Fax Relay
Percent of All DSP
Connections
Assigned for Fax
Relay
Remaining Voice
Processing Available
Channels
*
1
4
3%
124
2
8
6%
120
3
12
9%
116
4
16
13%
112
5
20
16%
108
6
24
19%
104
7
28
22%
100
8
32
25%
†
96
9
36
28%
92
10
40
31%
88
11
44
34%
84
12
48
38%
80
13
52
41%
76
14
56
44%
72
15
60
47%
68
16
64
50%
64
