User's Manual

#9 ViPR User Manual_Rev2.doc Page 54

The RTS threshold parameter specifies how large a packet must be before the unit will use

RTS/CTS handshaking in the over-the-air protocol. A value of 0 means the ViPR will always

use over-the-air RTS/CTS handshaking. A value equal to the RF_MTU (OTA maximum

transmit unit) means the ViPR will never use RTS/CTS handshaking. A value of 128 means

the ViPR will use RTS/CTS for packets larger than 128 bytes.

Note: This should not be confused with RTS/CTS for RS232 Serial ports.

Carrier Sense Level Threshold

Default = -110 dBm. This is the threshold the ViPR uses to determine whether a received

RF signal is a valid message or unwanted noise. If an RF level higher than the Carrier

Sense Level Threshold is detected, the ViPR will attempt to decode the signal and will not

transmit until the RF level drops. Outgoing data will be buffered until the channel is

available. The carrier sense may be raised to prevent false carrier sense detection if the

network is installed in a noisy environment. In certain situations where the ambient RF

noise level is very low, the carrier sense level threshold can be lowered to gain extra receive

sensitivity. (The ViPR's specified receive sensitivity depends upon the channel

bandwidth/speed being used. Refer to the product specification in Appendix A for details.)

IP SERVICES

 RIPV2

Enabled, Disabled (default). Router Information Protocol v2 is a dynamic IP routing

protocol based on the distance vector algorithm and is only used in Router Mode. RIPV2

is responsible for passing router information to other routers in the network.

 IPSD

Enabled (default), Disabled. I/P Services Delivery allows the generation of locally

provided I/P Services such as online diagnostics, etc.

 NAT

Enabled, Disabled (default). Network Address Translation (NAT) is a method by which IP

addresses are mapped from one address space to another. In a ViPR, it is normally

used on the WAN side of an IP network to hide local IP addresses from an external IP

network (example: the Internet).