6
Catalyst 6500 Series 24-Port FXS Analog Interface Module Installation Note
78-10975-02
Features
Fax and modem transport parameters are listed in Table 2.
Table 1 24-Port Analog Interface Module Features
Digital Signal Processing per Port
G.711, G.729, G.729A voice encoding
Silence suppression and voice activity detection
Comfort noise generation
Ringer, software programmable frequency and cadence, based on country
Dual tone multifrequency (DTMF) detection
Signaling, loop start
Modem detection
Line echo cancellation (32 ms)
Impedance (600 ohms)
Programmable analog gain, signaling timers
SPAN or port mirroring support
FXS Interface Features
Address signaling formats: In-band DTMF
Signaling formats: Loop start
Ringing tone: Programmable
Ringing voltage: Programmable, based on country
Ringing frequency: Programmable, based on country
Distance: 500 ohms maximum loop
Table 2 Fax and Modem Transport Parameters
Parameter Name Description Default
Fax relay enable Enables/disables fax relay support in the gateway.
Enabling this parameter will result in the gateway
attempting fax relay negotiation as part of the call
setup. If it is enabled but the far end does not
support fax relay, the fax call will switch to
pass-through mode.
Checkbox checked
Fax error correction
mode (ECM) override
ECM is a feature present in some higher-end fax
models that enables fax pages to be transmitted
error free. If ECM is enabled, the transmission has
a low tolerance to jitter and packet loss. This results
in a higher number of failed fax calls. For better
reliability (even with higher packet loss), ECM
needs to be disabled. ECM is disabled by enabling
the checkbox.
Checkbox checked
Maximum fax rate Defines the maximum fax transmission rate to be
used during the fax call. This can be used to restrict
the bandwidth utilized for fax transmission.
14400
