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DL3800 DS1 Inverse Multiplexer User Guide—February 1999
4
Payload Loopback
The payload loopback is used to verify proper T1 network operation of the
DL3800 and the T1 network. The Payload Loopback loops the payload
data received from the T1 network back towards the network. The data is
regenerated, and a new framing pattern is inserted prior to being looped
back. In this way the T1 framing of the unit and network can be veriÞed.
Line Loopback
The line loopback is used to verify the operation of the T1 network. The
line loopback loops the data received from the T1 network back towards
the network. The data is regenerated prior to being looped back; however,
no additional processing of the data is done by the DL3800. This
minimizes the impact of the DL3800 during this test so that network
problems can be isolated.
Local Loopback
The local loopback is used to verify the operation of the DTE and
connections. The local loopback loops the data received from the DTE back
towards the DTE at the network interface.
Figure 4-18 Loopbacks Within the DL3800
WARNING:
The Loopback tests will interrupt traffic to the DL3800.
DTE/NETwork
Loopback
Payload
Loopback
Line
Loopback
Local
Loopback
T1
Network
DTE
DL3800
T1
Transceiver
Framer
DTE
Interface
Summary of Contents for DL3800 DS1
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