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Enabling e&m control signals pass-through, Configuring the output gain of slic chip, Configuring dtmf – H3C Technologies H3C MSR 5600 User Manual

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Enabling E&M control signals pass-through

This feature operates only when the E&M non-signaling mode is enabled. As shown in

Figure 6

, an E&M

virtual private line is set up between the tone generator and the radio. Enable E&M control signals

pass-through for Router A and Router B so that they can send seize and idle signals for the E&M virtual
line over the IP network.

Figure 6 E&M analog control signals pass-through

To enable E&M control signals pass-through:

Step Command

Remarks

1.

Enter system view.

system-view

N/A

2.

Enter voice interface view.

subscriber-line line-number N/A

3.

Enable E&M control signals
pass-through.

passthrough

By default, this function is disabled.
Configure this command on both
the originating and terminating

devices.

Configuring the output gain of SLIC chip

Step Command

Remarks

1.

Enter system view.

system-view

N/A

2.

Enter voice interface view.

subscriber-line line-number N/A

3.

Configure the output gain of
the SLIC chip.

slic-gain { 0 | 1 }

Optional.
The default is 0 (0.8 dB).
This command controls signal
amplification.

Configuring DTMF

Dual tone multi-frequency (DTMF) uses a mixture of a high frequency tone and a lower frequency tone to

represent a key on a keypad. Each column of keys is represented by a high frequency tone and each row
of keys is represented by a low frequency tone. For example, as shown in

Figure 7

, the digit 1 is

represented by the combination of a pure 697 Hz signal and a pure 1209 Hz signal. Such DTMF tones

have good immunity to interference.