MX2800 M13 Multiplexer User Manual Configuration, Section 3
61200290L1-1G 3-13
Figure 3-9. Loopback Detection Menu
The following options are available for detection:
• Disabled is used to cause the T1/E1 lines to ignore in-band loop-up and loop-down codes.
• CSU is used to cause the channel to loop up or loop down when it receives a CSU loop-up or loop-dow n
pattern for more than 5 seconds.
• NIU is used to cause the channel to loop up or loop down when it receives an NIU loop-up or loop-down
pattern for more than 5 seconds.
Select Set Multiple to set a contiguous group or all of the T1/E1s to the same value at the same time. Refer
to Set Multiple on page 3-9 for a description of the Set Multiple option.
T1/E1 Circuit Protection
T1/E1 Circuit Protection determines which circuit is allowed to initiate a protection switch if a failure in
the circuitry for that channel is detected. See Figure3-10 on page 3-14. If a T1/E1 is set to Disabled, the
failure of the circuitry of that one channel does not cause a protection switch. If set to Enabled, the failure
of a channel causes a protection switch to occur if the Protection Threshold setting in this menu is
exceeded.