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8-2
8.1.1.1 Loopback
To incorporate the internal BERT functionality into the loop, select the BERT Enabled checkbox.
The general Network loopbacks are illustrated in the diagram below.
The general Equipment loopbacks are illustrated below.
Because of the Access Bank II architecture, not all loopbacks are available. If an unavailable loop-
back is selected, then the loopback not available dialog box is displayed.
Field Input
Data Access None, V.35, T1 #1, T1 #2
Direction None, Equipment Line, Equipment Payload, Equipment TSI, Network
Line, Network Payload, Network TSI
X
BERT
TSI*
X
To/From
T1 Line
XMT
RCV
T1
Transmitter
T1
Receiver
Multiplexer
(TSI)
and
Framing
Circuits
Payload
XMT
DS0
RCV
DS0
*Time Slot Interchange: the cross-connection logic.
X
BERT
TSI*
X
To/From
DTE Equipment
(e.g., Router)
XMT
RCV
DTE
Transmitter
DTE
Receiver
Multiplexer
(TSI)
and
Framing
Circuits
Payload
XMT
DS0
RCV
DS0
*Time Slot Interchange: the cross-connection logic.