Patton electronics SmartNode Series - Configuring Output Gain; Configuring the Echo Canceller; Applying Output Gain; Echo Cancellation

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PSTN profile configuration task list 594

SmartWare Software Configuration Guide 48 • PSTN profile configuration

Procedure: Create a PSTN Proﬁle and enter the PSTN proﬁle conﬁguration mode

Mode: Conﬁgure

Conﬁguring the echo canceller

Echoes are reﬂections of the transmitted signal that result from impedance mismatches in the hybrid (bi-direc-

tional 2-wire to 4-wire conversion) device, causing an echo on the wire. Echo cancellation provides near-end

echo compensation for this effect as shown in ﬁgure 9.

Figure 9. Echo Cancellation

Procedure: Disable echo cancellation.

Mode: Proﬁle PSTN

Conﬁguring output gain

The output gain determines the voice output volume gain towards PSTN ports as shown in ﬁgure 10.

Figure 10. Applying output gain

Procedure: Conﬁgure voice output gain.

Step Command Purpose

1 node(cfg)#profile pstn name Create a PSTN profile with name name and enter PSTN profile

configuration mode. The newly created profile contains default

values for all parameters.

If a profile with name name already exists, only the PSTN profile

configuration mode is entered.

2 node(pf-pstn)[name]#... Configuration steps as described in the chapters below

Step Command Purpose

1 node(pf-pstn)[name]#no echo-canceller Disable echo canceller (Default: Enabled)

Echo

Echo canceller

Node

Context CS

“switch”

PSTN interface

Outgoing voice is amplified by

“output gain”

voice volume: 10 dB

PSTN

Profile