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Chapter 5. Testing
20 ISU 128 User Manual 61202.029L2-1
Figure 5-2
Test Menu Tree
Loopback DTE
Loopback DTE causes the ISU DTE port to loop back toward user equipment.
This allows performance of a bit error rate test (BERT) between the ISU 128
and the end user equipment to verify proper cable connection.
Loopback Network
Loopback Network forces the ISU 128 to loopback both the B1 and B2 chan-
nels toward the network. This can be used to allow a far-end user to perform
a BERT all the way through the network.
Loopback Protocol
Loopback Protocol allows data to loopback toward the network after passing
through a selected protocol such as T-Link or BONDING. See Figure 5-3 for
loopback points.
Figure 5-3
Loopback Points
1=STATUS
2=TEST
3=CONFIG
4=DIAL
1=Loopback DTE
2=Loopback Netw.
3=Loopback Proto
4=Loopback Remote
5=Test Remote
6=Lpbk Disable
7=NEBE/FEBE
0=Software Ver
1=No Rem Lpbks
2=DDS Accepted
3=V54 Accepted
4=DDS + V54 Accept
NET
IFC
RATE
ADAPTION
DTE
IFC
NETWORK
Network
Protocol
DTE
DTE