Cabletron Systems SmartSwitch 6000 User Manual page 209

User Data
Facilities
DTR/RTS Active When VC Up
Input Signal Detection
RTS-CTS H/W Flow Control
Disconnect Timer
Disconnect Duration
Timeout if No Login
Configuring Async Ports
is an (optional) string of ASCII characters that will be placed verbatim into the user
data field of an outgoing Call Request packet.
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.
if means that DTR and RTS will be asserted only after a virtual circuit is established.
Y
If , both signals will be asserted as soon as the port is enabled.
N
determines which signal(s) will be read to determine that the link is up:
= none required
0
= DSR
1
= DSR & DCD
2
= DSR & DCD & Call
3
= DSR & CTS
4
= DSR, DCD, & CTS
5
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.
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
, and
Timeout if No Call
seconds after the number of minutes specified.)
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
nected after a timeout or logout. For a leased or directly connected line,
should be , to avoid disconnections.
Duration 0
if , starts the disconnect timer the moment the user enters login state; e.g., when DSR
Y
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
will be initiated. (The modem signals will be dropped.)
. (The actual timeout may be up to thirty
Timeout if No Data
, to ensure that the line does not remain physically con-
0
Disconnect Duration
Timeout if No Login
Disconnect
is not , a physical disconnect
0
,
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