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Multiserver 5000
124
10.9 Connect Protocol Details
Connect protocol is option 1 of the Switching
Parameters menu. There are three connect
protocol options: Dedicated, Auto, and DTR. A
discussion of the protocols and how to configure
them is in
Section 10.7, Asychronous Channel
Switching Parameters
, and
Table 10-2
. This section
discusses how the call request, completion, and
disconnect sequences operate for the dedicated,
auto-answer, and DTR protocols.
Definitions
:
Calling
port:
Receive Inhibit
=
on
Call Inhibit
=
off
Receiving
port:
Receive Inhibit
=
off
Call Inhibit
=
on
Dual
port:
Receive Inhibit
=
off
Call Inhibit
=
off
NOTE: The
Dual
port is both a calling and receiving
port.
D
EDICATED
P
ROTOCOL
Call Request
(
Calling
and
Dual
port)
Idle State:
Multiserver holds DSR, CTS, and
CD
high
. RI is held
low
.
•
Data activity automatically triggers a call
request.
or
•
If ABR (auto baud rate) is enabled, type
<cr>
to trigger a call request (see
Section 9.3, Asychronous Channels
).
Call Completion
(
Receiving
and
Dual
ports)
No indication of call completion unless
the called port is an ABR port. Then the
port is set to the calling port’s speed, and
the sign-on character is forwarded.
Disconnect Sequence
(
Calling
,
Receiving,
and
Dual
ports
Calling
port:
1. Device initiates
<break><break><break>
.
2. Multiserver sends
DISCONNECTED
message.
Receiving
port
1. Device initiates
<break><break><break>
.
2. No indication of disconnection.
DTR P
ROTOCOL
Call Request
(
Calling
and
Dual
ports)
Idle State:
DTR can be
high
or
low
.
Multiserver holds DSR, CTS, CD,
and RI
low
.
1. Device raises or toggles DTR.
2. Multiserver then raises DSR, CTS, and
CD.
3. If ABR is enabled,
<cr>
should now be
typed (see
Section 9.3, Asychronous
Channels
).
Call Completion
For
Receiving
port
Idle State:
DTR must be
high
, otherwise the
port is put out of service (OOS). In
either case, the Multiserver holds
DSR, CTS, CD, and RI
low
.
1. Multiserver raises DSR, CTS, and CD.
2. No response is required from the device.
3. If ABR is enabled, then
<cr>
will be
forwarded.