Specifications

Ethernet Loop Testing Page E-12
Transmit assistance.
The message so far is encapsulated in a Forward Data message
with the remote station as the forward address. The resulting
message is then sent to the assistant address.
Receive assistance.
The message so far is encapsulated in a Forward Data message
with
the assistant address as the forward address. The
resulting message is then sent to the remote station.
Full assistance.
The message so far is encapsulated in a Forward Data message,
with the assistant address as the forward address. This, in
turn, is encapsulated in a Forward Data message with the
remote station address as the forward address. The resulting
message is then sent to the assistant address.
Receive processing is the same as was described for LoopDirect.
E.4.2.3 LoopPoll Function
The LoopPoll function returns the state of the operation. If the
state is successful completion, the responding station address is also
returned.
If a receiveBuffer was provided on the initial request, the
received message is returned, truncated
if it will not fit.
E.4.2.4 LoopAbort Function
The LoopAbort procedure simply marks the receiptNumber as aborted
if
it is not already complete.
E.5 Protocol Messages
This section defines the format of the Loop Test protocol messages.
The descriptive and transmission conventions are the same as for the
body of the Ethernet specification.
The Loop Test protocol contains the following messages:
Funct ion
Code Function
1 Reply
2 Forward Data