Cabletron Systems MMAC-Plus 9F116-01, User Manual, Page: 209 / 420

Configuring Async Ports 10-13
User Data
is an (optional) string of ASCII characters that will be placed verbatim into the user
data field of an outgoing Call Request packet.
Facilities
is an (optional) string of facility codes and related data that will be placed verbatim
into the facility field of an outgoing Call Request packet.
DTR/RTS Active When VC Up
if
Y
means that DTR and RTS will be asserted only after a virtual circuit is established.
If
N
, both signals will be asserted as soon as the port is enabled.
Input Signal Detection
determines which signal(s) will be read to determine that the link is up:
0
= none required
1
= DSR
2
= DSR & DCD
3
= DSR & DCD & Call
4
= DSR & CTS
5
= DSR, DCD, & CTS
RTS-CTS H/W Flow Control
enables hardware flow control through stop/start of data using RTS (pin 4), CTS (pin
5), and CD (pin 8) on the RS-232 interface. Flow control is usually necessary to
maintain communication without data loss between devices or channels with different
throughput capabilities.
RTS-CTS flow control works only on a physical DTE port, as physical DCE ports
have RTS looped back internally to CTS.
The other common method of flow control is XON-XOFF (parameters 5 and 12 of the
async PAD profile); however, when the data itself is likely to contain these characters
(for example, in a binary file), XON-XOFF may become inadequate.
Disconnect Timer
is an inactivity timer that determines the length of time the port can go without trans-
mitting or receiving characters, as determined by the parameters
Timeout if No Login
,
Timeout if No Call
, and
Timeout if No Data
. (The actual timeout may be up to thirty
seconds after the number of minutes specified.)
Disconnect Duration
is the length of time the PAD will drop the modem signals after logout of the user
(whether caused by a timeout or user command). For a dial-in line, this should be set
to something greater than
0
, to ensure that the line does not remain physically con-
nected after a timeout or logout. For a leased or directly connected line,
Disconnect
Duration
should be
0
, to avoid disconnections.
Timeout if No Login
if
Y
, starts the disconnect timer the moment the user enters login state; e.g., when DSR
is asserted on the modem, or when a direct-connect user logs out. As long as the dis-
connect timer has not expired, the user can continue to attempt to log in. On a dial-in
line, if the timer has expired and
Disconnect Duration
is not
0
, a physical disconnect
will be initiated. (The modem signals will be dropped.)