3Com S200 PAD Port Configuration for Autospeed, Implementing, Auto Baud, Sequence, Parameter

PAD Port Configuration

PAD Port Configuration for Autospeed

Introduction	Autospeed is a convenient way to configure a PAD port's speed, especially when you
	want a mix of terminal speeds. For example, autospeed is useful when the PAD port
	is connected to a modem that is being called by devices with different speeds.
Implementing
	To implement autospeed, set the Port Record parameter Port Speed = AUTO.
Autospeed	When the device calls the port, the port determines the speed of the device and
	programs its I/O drivers to match the device's speed.
Auto Baud
	A related parameter that affects Autospeed is the Auto Baud Sequence (in the PAD
Sequence	Port Record). This parameter specifies the Autospeed Recognition Character that the
Parameter	port uses to set the correct speed. These are the settings available under the Auto
	Baud Sequence parameter:
	• CR_Only: Autospeed on <CR>.
	• CR_DOT_CR: Autospeed on <CR>.<CR>.
	• TYMNET: Autospeed on the letter “a” (must be lower case).
	• TELENET: Autospeed on <CR><CR> for 1200 bps or lower and @ <CR>
	for 2400 bps or higher.
	The default is <CR>. The autobaud feature is extended to support 14.4 Kbps, 19.2
	Kbps, 28.8 Kbps, and 38.4 Kbps for all autospeed recognition characters. These
	speeds are not supported on the UIO or AIO cards.
Autospeed Inter-
	Inter-Character Delay is the transmission time interval between characters. For
Character Delay	example, Figure 4 shows the autospeed inter-character delay applied to the
	CR_DOT_CR sequence presented above.

CR

. (dot)

CR

100 msec

100 msec

	Autospeed Inter-Character	Autospeed Inter-Character
	Delay
			Delay
	Figure 4. Autospeed Inter-Character Delay
Reduced
	When using a dialup modem with a POS terminal or PC to send an Autobaud
Autospeed Inter-	Sequence, problems may occur if the inter-character delay applied to that sequence is
Character Delay	less than 180 msec. To overcome this, you must enter a CSK
	(5ERWXW2F76XHLTTUUZC3) to reduce the inter-character processing time to
	100 msec.

Note

Reducing the autospeed inter-character delay also has the effect of increasing the minimum supported autospeed to 300 bits/sec.

22 Configuring PAD/ATPAD Ports