Zhone Technologies IMACS-200 - Manual (Page 153)

FXS Ports 6-5
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 -6.5 dB to +9.0 dB.
CODING
The Coding field sets the PCM companding (coding) method used for a port. Changing the
coding field will apply the coding type selected to all four ports. Generally, the North
American T1 environment uses u-law (mu-law) coding, and the European E1 envisonment
uses a-inv. The coding default setting is defined by the type of associated WAN or OWAN
port.
LB
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