Zhone Technologies IMACS-200 - Manual (Page 169)

E&M Ports 7-9
Tx TLP
The Transmit TLP setting controls the amount of gain or loss added to the voice signal coming
in from the local CPE before it is encoded to digital PCM. To increase the incoming signal
level, set the Tx TLP field 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 number (i.e.,
the more positive the number, the more the signal level is decreased). For example, an
incoming signal at -16 dBm can be increased to 0 dBm by setting Tx TLP to -16 dB. For the
IMACS-200 E&M ports, this range is-16.5 dB to +7.5 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 LB setting allows you to loop a port back toward the network and far end for testing and
troubleshooting. Figure 7-6 shows the available loopbacks. The dgtl (digital) loopback sends
the incoming digital signal from the network back toward the far end, without decoding it. The
anlg (analog) loopback sends the decoded analog signal back to the far end. To disable either
loopback after testing, set this field to off.
Figure 7-6. E&M port Loopbacks