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3028
Turbo
Statistical Multiplexer
2-58
154001UA
Local Channel Loopback
Local Channel Loopback
Local Channel Loopback
Local Channel Loopback
Local Channel Loopback
The
LOCAL CHANNEL LOOPBACK
command sets or clears, on a selected local
channel, the inward and outward looping of the receive and transmit data streams
at the channel interface. The signals incoming on Pin 2 (TxD) are looped back on
Pin 3 (RxD) and data incoming from the link to the looped channel is sent back to
the link as received (Figure 2-10). This parameter is an effective troubleshooting
mechanism, but disrupts the normal channel traffic for the duration of the
loopback state. This command acts as a toggle switch. The second time it is
selected the channel loopback is cleared.
A
CHANNEL RESET
, System Reset, or power failure will clear a channel loopback
state. To determine the loopback status use the
CHANNEL STATUS
command.
2 0 3 1 2 -3 4
2
3
2
3
A
LOCAL
CHANNEL
LOOPBACK
LOCAL
LINK
LOOPBACK
2
3
2
3
B
REMOTE
CHANNEL
LOOPBACK
Figure 2-10. Loopback Points from 3028
Figure 2-10. Loopback Points from 3028
Figure 2-10. Loopback Points from 3028
Figure 2-10. Loopback Points from 3028
Figure 2-10. Loopback Points from 3028
Turbo (CTS 2031 Turbo)
Turbo (CTS 2031 Turbo)
Turbo (CTS 2031 Turbo)
Turbo (CTS 2031 Turbo)
Turbo (CTS 2031 Turbo)
Multiplexer A
Multiplexer A
Multiplexer A
Multiplexer A
Multiplexer A
Front Panel Access
From the
COMMAND MODE
display:
PRESS:
NEXT or LAST
until
LOC CHNL LOOPK BK
displays on the second line
PRESS:
SELECT
PRESS:
NEXT or LAST
to choose a channel number
Note
In Supervisory Mode, do not Issue a
Channel Loopback to the Data Channel
you are Attached to; Communications is
Lost to That Channel.