Loopback dte, Loopback network, Loopback protocol – ADTRAN ISU 128 User Manual

Page 35

Chapter 5. Testing

ISU 128 User Manual

61202.029L2-1

Figure 5-2

Test Menu Tree

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

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

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