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Chapter 5.Testing
Loopback DTE
This test causes the DTE port to loop back toward user equip-
ment. This allows a bit error rate test (BERT) to be performed
from the local end-user equipment to the ISU 2x64 to verify
proper cable connection, etc. Either a BERT tester or DTE data
packet test must be used for this test.
Loopback Network
This test forces the ISU 2x64 to loop back both the B1 and B2
channels 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
This test causes data to be looped back toward the network after
passing through a selected protocol such as T-Link or BONDING.
See Figure 5-3 for loopback points.
NET
NETWORK
IFCE
24
1=Loopback DTE
2=Loopback Netw.
1=STATUS
3=Loopback Proto
2=TEST
4=Loopback Remot
3=CONFIG
5=Test Remote
4=DIAL
6=Lpbk Disable
7=NEBE/FEBE
8=Software Ver
9=Lpbk Both DTEs
10=Test 2047 Both
RATE
ADAPTION
Network
ISU 2x64 Dual Port ISDN Service Unit User Manual
1=No Rem Lpbks
2=DDS Accepted
3=V.54 Accepted
4=DDS+V54 Accept
Figure 5-2
Test Menu Tree
DTE
Protocol
DTE
DTE
IFCE
Figure 5-3
Loopback Points
61200051L1-1D
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