User guide

T1-A and T1-B Tests
222 AXS-200/805/855
T1-A/T1-B Loopbacks
T1-A/T1-B Loopbacks
Loopbacks are not available with Monitor and Bridged test modes.
Press , select DSn/PDH, T1-A or T1-B, and Loopbacks.
Loopbacks
Loopbacks are divided into 5 different categories. Selecting a loopback
from one of the 5 categories will automatically set to None the remaining
4 categories. Available loopbacks are listed by category as follow:
³ HDSL
NREM loops the remote HTU-R
towards the network.
NLOC loops the HTU-C toward
the network.
NDU1 loops 1st doublers towards
the network.
NDU2: loops 2nd doublers
towards the network.
CREM, from CPE, loops the HTU-C towards CPE.
CLOC loops local HTU-R towards CPE.
CDU1 loops 1st doublers towards the CPE.
CDU2 loops 2nd Doublers towards the CPE.
ARM places HDSL / T1 elements into diagnostic mode for detection of
loopbacks.
HTU-R loops HTU-R towards the Network.
HTU-C loops HTU-C towards Network.
HRE-1 loops 1st Extender towards Network.
HRE-2 loops 2nd Extender towards Network.