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Appendix C. System Messages
DS-1 (PBX) Interface
C-4
511 Pattern Off
No longer sending 511 pattern towards the network
interface.
The following messages indicate the status of the DS-1 in-
terface:
Frame Slip
Indicates a Frame Slip has occurred on the DS-1 interface.
This is present in Alarm History only.
Line Loop Up
Line loopback activated.
Port Loop Up
Port loopback activated.
Loopdown
Loopback has been deactivated.
TDU 120e User Manual
61202156L2-1
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