Chapter 5.Loop Back & BERT Testing
57
May 2011
5.3 USER Activated Loop Back.
The ETU-01A supports the following types of test loop backs.
E1 line local analog loop back.
E1 line local digital loop back.
E1 line local payload loop back.
E1 line remote analog loop back.
E1 line remote digital loop back.
Data Port local analog loop back.
Data Port local digital loop back.
Data Port V.54 remote loop back.
The user activated loop back functions are accessed from the LOOPBACK PARAMETER
menu on the front panel LCD, through the Test Function Parameter => Loop Back Test menu
via the console port terminal or with set commands issued by an SNMP management workstation.
The available test functions are described in the following pages.
E1 line local analog loop back
The E1 line local analog loop back is performed by connecting the main link transmit signal to
the input of the receive path in the Channel Service Unit (CSU), as shown in Figure 5-1. This
returns the transmit signal of the Data port to the receive path of the Data port. The Data Port must
receive its own transmission (not recommended for Ethernet bridge or router modules). This loop
back fully tests the local ETU-01A operation and the connections to the local DTE. During this
loop back, the ETU-01A E1 line sends an unframed "all ones" signal to the remote equipment.
Before initiating this loop back, disconnect the LAN cable from the rear panel Ethernet Bridge
interface.
Figure 5-1. E1 link local analog loop back
“1”
User
DTE
Data
Port
E1
E1 LINE
LOCAL ETU-01A
DSU
CSU
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