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6-4 FXS Ports

Model No.

Running Head

Tx TLP

The Transmit TLP setting controls the amount of gain or loss added to a voice signal from the

CPE before it is encoded to digital PCM. To increase the signal level, set the Tx TLP setting

to a negative value (i.e., the more negative the number, the more gain is added). To decrease

the signal level, set the Tx TLP setting to a positive value (i.e., the more positive the number,

the more the signal level is decreased). For example, an incoming signal at -5 dBm can be

increased to -2 dBm by setting the Tx TLP to -3 dB. The Tx TLP range is -3.0 dB to +9.0 dB.

CODING

The Coding setting sets the PCM companding method used for a port. Generally, the North

American T1 environment uses u-law coding. This parameter will impact all four FXS ports.

The default coding setting is determined by the type of associated WAN port.

The Loopback field lets you loop the port back toward the network and far end. The dgtl

(digital) loopback sends the incoming digital DS0 signal back to the far end without decoding

it. The anlg (analog) loopback sends the decoded analog signal back to the far end after

decoding and then re-encoding it. Figure 6-2 shows the loopback options, which allow you to

test and troubleshoot the FXS port. To disable a loopback, set this field to off.

Figure 6-2. FXS port Loopbacks

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Zhone IMA CS-200 System Spezifikationen Seite 124