Specifications

Chapter 4 Troubleshooting and Diagnostics D8E1T1 Installation and Operation Manual
4-10 Diagnostic Loops
Framer
TX
RX
TX
RX
TX
RX
TX
RX
TX
RX
TX
RX
TX
RX
TX
RX
Local Loop
Line Loop
Payload Loop
Remote Loop
Remote End
Local End (DXC-100)
(all loops initiated from this end)
Payload Loop is different than a line loop, in that
it only loops the data (payload), and the framing
is regenerated.
WAN
NI
DCE
DTE
(Other Module)
Framer
NI
DCE
DTE
For Line Loop, the framing is not regenerated and
the entire frame is looped.
Backplane
Module D8E1T1
TX
RX TX
RX
User-Defined Loop
Smart Jack
Transmits a user-defined code that is recognized
by a remote unit, which will then place itself into
loopback.
TX
RX TX
RX
Analog (LIU) Loop
TX
RX TX
RX
Backplane Loop
TX
RX TX
RX
SmartJack Loop
Transmits a code that is recognized by a remote
SmartJack, which will then place itself into
loopback.
Figure 4-7. D8E1T1 Diagnostic Loops