ADTRAN TSU 120e - Manual (Page 127)

Appendix D. System Messages
61202129L1-1 TSU 120 User Manual D-3
Nx56/64 Interface
The following messages indicate the status of the Nx56/64
card:
DSX-1 (PBX) Interface
The following messages indicate the status of the DSX-1 inter-
face:
Loop Up Data is looped at both the network inter-
face and DTE interface of the card
Remote Loop Up Sending V.54 pattern in an attempt to
loop up a remote device
511 Pattern On Sending 511 pattern towards the network
interface
Loop Down Data is no longer looped back at the net-
work interface or DTE interface
511 Pattern Off No longer sending 511 pattern towards
the network interface
Frame Slip Indicates a Frame Slip has occurred on the
DSX-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