Zhone Technologies IMACS-200 manual Local Network Loopback, LB GEN Mode

Figure 9-4.Local Network Loopback

LB GEN MODE

The Loopback Generation Mode (LB GEN MODE) setting defines the type of inband loop-up and loop-down codes that will be sent to the remote equipment. Two industry-standard codes are supported: v.54, which is compatible with CCITT V.54 standard and ft1, which is compatible with ANSI Fractional T1 standards.

LB GEN

If you selected v.54 or ft1 as the Loopback Generation (LB GEN) mode setting, the Loopback Generation setting allows you to send an on (loop-up command) or off (loop-down command).

Note that you cannot perform loop-up and loop-down commands on more than one port of the IMACS-200 simultaneously. You must finish all loopback operations on one port before starting them on another port.

LB DET

Depending on the selection you made for the Loopback Generation mode above, the IMACS-200 port will respond to any of the loopback codes generated by a remote system. The Loopback Detection (LB DET) setting lets you enable or disable this capability on each port. However, this setting does not affect local loopback commands from a local control terminal.

Choose off to have the port ignore remote loopback commands. Choose on to make the port monitor for loopback commands sent from the remote equipment. Note that the system will detect only the loopbacks in the format selected as the LB GEN mode. When the system detects a loopback code, it loops the data back until the remote equipment releases the loopback. The w/to (with time-out) setting is the same as on, except that after 10 minutes the system automatically releases the loopbacks initiated by the remote equipment.

9-8 High Speed Data Ports