host
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... ii) Much local I/O and/or CPU time between messages - is it
that, if a HOST's user fails to use a link for 15 seconds,
the HOST ...
... HOST's user fails to use a link for 15 seconds,
the HOST network program must generate a dummy message
merely to keep the link ...
... link open?
2. Steve Crocker, HOST Software, 1969 Apr 7, asks on page 2: "Can a
HOST, as opposed to its IMP ...
... 2. Steve Crocker, HOST Software, 1969 Apr 7, asks on page 2: "Can a
HOST, as opposed to its IMP, control RFNM's?" BBN, Report No. 1837,
...
... RFNM and then discovers it cannot, for some reason,
complete timely delivery of the last received message to its HOST?
This seems especially pressing since I don't recall seeing anywhere an
IMP ...
... IMP constraint upon HOSTs that they must accept incoming messages
within some specified maximum time.
...
... within some specified maximum time.
3. A HOST has to be prepared to repeat transmissions of a message
into network (see, e.g., Page 17, BBN 1822) therefore why the
...
... Normally the times involved differ by many orders of magnitude but a
high priority non-network HOST responsibility could delay next bit for
a long time.
...
... IMP's link table will, in
general, have no effect upon a Host transmission (or reception) at
that IMP's site. Let us distinguish between non-use of a link ...
... link in-
between messages and non-use of a link due to Host program delays in
the middle of transmitting or receiving ...
... the middle of transmitting or receiving a message. When the Host
transmits a message on a link for which an entry is not in the link ...
... link
table, one will simply be inserted there. There is no need for
"dummy" Host messages to keep a link "open" since a link is
...
... to occur) is there a possibility of resulting delay.
Arbitrary delays introduced by Host programs are also not
inconsistent with the link entry deletion procedure. A link ...
... delays was only intended to have hardware implications insofar as the
Host/IMP interface is designed to transfer bits ...
... IMP's output queue to the
Host (i.e. just before a message is sent to the Host). If a
destination ...
... destination IMP cannot then deliver that full message to the Host, at
most one more message may possibly arrive at that IMP due to the
...
... RFNM. The new message will subsequently
take its place at the end of the output queue to the Host thus
guaranteeing the preservation of the proper message arrival sequence.
...
... The NOP message is a special control message which is available for
use during initiation of communication between the Host and its IMP.
The Host ...
... Host and its IMP.
The Host may, of course, decline to send NOP messages during this
period, but the first received message after IMP startup or after the
...
... IMP startup or after the
Host ready indicator has gone on, may be discarded by the IMP. We do
not require a Host ...
... Host ready indicator has gone on, may be discarded by the IMP. We do
not require a Host to be prepared to repeat transmissions into the
network.
...