Verilink Access Manager 2000 (896-502037-001) Product Manual - Manual (Page 323)

Testing CSU
Access Manager 2000 User Manual 8-53
You will activate the CSU loopback that is required for this test. For
example, when sending a test signal toward the NET (network), an RLB
is first activated at the near-end NCC or TAC. An LLB or PLB can be
activated at the far end. As another example, when a test signal is sent
toward the EQPT (equipment), a PLB is first activated at the near end.
This T1 test signal application is shown in the figure below
Figure 8-2 Applying a T1 test signal
To test an AS2000 CSU
1. When you get the On-line Access sub-menu, select the Select
Test option. The Specify Circuit Element to Receive Test Request
screen appears.
2. Enter the shelf in which the desired NCC or TAC is located. This
number can be from 1 to 4 in each Access System 2000 node or
Test toward equipment
Eqpt
Repeater
Near-end NCC or TAC Far-end NCC or TAC
NCC or TAC
LLB PLB RLB
PLB
DET
GEN
DET
GEN
Eqpt Eqpt Network
Network
Test toward net
GEN = Test Signal Generator
DET = Error Detector / Counter