Online Diagnostics
This section gives information for online diagnostics.
The
wrap commands are provided to isolate the fault. Several levels of wrap can be used.
Local Wrap Commands
Internal wrap: the data path stays inside the module.
External wrap: a physical wrap must be
wired from transmitter to receiver.
Reply mode wrap: an internal wrap from the receive side to the transmit side allowing to exercise the
whole path from a port to another one.
Payload wrap: an internal wrap from the receive side to the transmit side allowing to exercise the
whole path from a port to another one including transmitter, receiver and framer of remote module.
The following drawings show the operating mode of the four wrap levels.
TX
RX
TX
RX
Out
In
Out
In
In
In
Out
Out
Internal Wrap
External Wrap
SWITCH
SWITCH
Framer
Framer
TX
RX
TX
RX
Out
In
/ /
/ /
External Wrap
Reply_Mode Wrap
SWITCH
SWITCH
Framer
TX
RX
TX
RX
Out
In
/ /
/ /
External Wrap
Payload Wrap
SWITCH
SWITCH
Framer
Note: On a 4-Port 155 Mbps module, a port can be configured in reply mode and another port of the same
module in wrap external.
Chapter 3. Procedures
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