Specifications

Interfaces Page 31
Input-buffer
- a buffer containing the data to be looped.
Output-buffer
- a buffer to contain the looped back data. If not
present, the looped back data
is not returned to the user.
Outputs:
Return-code
- the status of the request. One of:
Request accepted
- the loop will be attempted.
Unrecognized channel
- there is no channel with the specified
identification.
Channel in wrong state
- the channel is in a state where a
loop cannot be done.
Receipt-number
- the request identification used in the Loop-poll
or Loop-abort function to identify this request.
Function:
Determine
if some other system can communicate with the specified
remote system. Applicable only on multiaccess channels.
Inputs:
Channel-id
- the unique identification of the channel on which the
loop is to be done.
Destination-address
- the identification of the system that is to
be looped to. The destination-address cannot be a multicast
address.
Assistant-address
- the
identification of the third party system
to assist in the test.
The address .cannot be a multicast address.
Assistance-level
- the amount of assistance desired:
transmit
- the assistant station is only to relay the request,
the request is to be returned from the destination system.
receive
- the assistant station is only to relay the reply,
the request
is to be sent to the destination station.
full
- the assistant station is to relay both request and
reply.
Input-buffer
- a buffer containing the data to be looped.