Specifications

Interfaces Page 17
Destination-address
- the address of the frame destination. This
can be either a physical address or a multicast address.
~pplicable only on multiaccess channels.
Protocol-type
- a protocol type to identify the data at the
receiving system. Applicable only on concurrent maintenance
channels.
Input-buffer
- a buffer containing the data to be sent.
Until the
request is completed, the user must not disturb the contents of
the buffer.
Outputs:
Return-code
- the status of the request. One of:
Request accepted
- the data link will attempt to transmit the
frame. Notification of completion is via the Transmit-poll
function.
No resources
- the data link does not have sufficient
resources to queue a transmit for this port.
Unrecognized port
- there is no open port with the specified
identification.
Channel in wrong state
- the channel is not in a state where
it can send a frame.
Function:
. .
Checks for the completion of a transmit request. The data linr:
transmits frames in the order in which the user submits them.
Successful completion of this function implies only that the local
transmitter believes that it sent the frame. It does not
necessarily imply that the destination received it.
Inputs:
Port-id
- a port identification assigned by the Open function.
Outputs:
Return-code
- the transmit request for this port. One of:
Not complete
- no transmit for this port is done.
None outstanding
- there are no outstanding transmits for this
port.