Black Box 3600 MODEM manual Testing the Local Modem, Local Analog Loopback &T1

Test Mode Operation

For example, to run the self test analog loopback test for 30 seconds, enter

ATS18=30&T8

The modem should respond with 000 after 30 seconds.

Testing the Local Modem

Test local operation with the modem offline in command mode. Use LAL and LAL/TP to test the local modem and the communications to the local DTE.

Note

Figures 7-1 through 7-5 include LED test indications. These indications are valid when DTE options are set by factory option set #1 and RTS is active from the DTE. Where indicated, RD and/or TD may be on, off, or flashing depending on the type of DTE and its operating state.

Local Analog Loopback &T1

In Local Analog Loopback the modem transmitter connects to its receiver so the analog signal normally sent over the telephone line is received locally.

If operating on leased lines, the lines are terminated into 600 ohms (Figure 7-1). If off hook on a dial-up line, the modem is forced on hook.

Figure 7-1. Local Analog Loopback

(4-Wire Operation and 2-Wire Operation)

Modem 3600 7-3