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12-12 SmartSwitch 1800 4.0 User Guide, Rev 01
Autocall Delay
causes a delay after the link comes up before a Call Request will be issued.
Called Address
is the ID of the remote device, and is placed into the called address field of the Call
Request. This parameter is relevant only if
Autocall
is
Y
; if
Autocall
is
N
, the called
address will come from either the user device’s X.28 interface or an abbreviated
address.
If the async port is one end of a connection to a logical X.25 port in the SmartSwtch,
the Called Address must match a Subscriber ID (see page 12-15) configured for the
logical port.
Retry Count
is the number of times an autocall will be sent to the remote device.
Retry Interval
is the time between autocall attempts.
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.