Avocent Cyclades-PR2000 installation manual Parameter, Description

Cyclades-PR2000

PPP Menu (Continued)

Parameter	Description
Disable LCP Echo	LCP (Link Control Protocol) messages are normally exchanged to monitor the status of
Requests	the link. Disabling these messages reduces traffic, but the link then has no way of
	knowing if the other end is still connected.
Time Interval to Send	Config Request messages are used to negotiate the parameters at the start of a PPP
Config Requests	connection. For a slow line, this time should be increased to allow the reply to return
	to the sender. If not, the sender will assume it was lost and send another.
Edit ACCM	Applies to asynchronous connections only. Permits control character mapping
	negotiation on asynchronous links. This is useful when you need to send a control
	character as data (e.g. XON/XOFF, Crtl A, etc.) over an asynchronous link and do not
	want it interpreted by the modem or other device in the middle. The map is built up
	with the following commands.
	Clear – Resets the ACCM table toggle;
	Toggle XON/XOFF – Add XON/XOFF control characters to the ACCM table;
	Toggle Char – Add other control characters to the ACCM table, using their ASCII
	value.
	Typing the option once (for example, X), includes it in the table. Typing it again
	excludes it from the table. More details are given in the CyROS Reference Guide.
Enable Predictor	Enables data compression using the Predictor algorithm. This feature should be
Compression	enabled only if Cyclades' equipment is being used on both ends of the connection
	because there is no established standard for data compression interoperability. Data
	compression is very CPU-intensive, making this feature effective only for links running
	at speeds under 1Mbps. At higher speeds, the time necessary to compress data
	offsets the gains in throughput achieved by data compression.
Number of Bits for	Applies when Predictor Compression Enabled. Sixteen is fastest, but 10 must be used
Compression	if the router on the other end is a PathRouter, for compatibility.
Connection Type	Applies to asynchronous connections only. NT-Serial Cable is a direct connection to a
	Windows NT computer. This is necessary because NT requires a negotiation before
	the beginning of the PPP negotiation. Direct is used for other connections using
	cables or leased lines.

Chapter 8 - Data-Link Protocols (Encapsulation) 53