Black Box MWU2000-G703, MWU2000-X21 manual MCP Parameters Menu, Line Interface Unit Type Menu

2.048Mbps Wireless Modem

For fractional E1/T1, the LIU card performs the loopback. Both clock and data are looped back. When the Master modem is set for loopback operation, the clock starts drifting from the clock of the end equipment (under normal conditions, the system clock is supplied by the Master end equipment). Eventually this will lead to error messages and the link will be disconnected. Therefore, loopback tests on the Master side should be as short as possible and should be limited to 1 to 2 minutes at the most. It is recommended to avoid performing loopback test on the Master unit in Fractional E1/T1 applications, or alternatively to switch the master/slave definitions of both sides for the duration of the test. For V.35 LIU and RS- 530/X.21 LIU configured to operate with an external clock, the end-equipment (or alternatively a BER meter) should be connected to the unit during the test in order to supply the required clock.

Line Interface Unit Type Menu

Table 3-8. Line Interface Unit Type Menu Options

MCP Parameters Menu

The MCP Parameters menu gives you access to the following parameters:

•Network ID

•Master-Slave

•Total Link Delay

•Modem Initialisation String

•Number of Links to Synchronize.

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