User's Manual

001-5008-000 rev5_2.doc Page 59
When data is ready to transmit, the ViPR will first check the receive level. If the receive
level is below the carrier sense threshold, the ViPR will immediately transmit data. If the
receive level is above the carrier threshold, the ViPR will try to determine if it is receiving
valid data or just noise. If it is receiving noise, the ViPR will go ahead and transmit. If it is
receiving valid data, the ViPR will wait until the complete packet has been received before
transmitting. The ViPR will typically take somewhere between 5 ms to 250 ms to determine
if it is receiving valid data or just noise.
Disabled: In this mode, the ViPR will attempt to receive/decode data when the received RF
level is above the carrier sense threshold. When the ViPR has data to transmit it will
immediately transmit the data. The ViPR will immediately stop receiving any packets and
will transmit over any other ViPRs that are on the air and over any interference that may be
in the area.
This mode should only be used in a polling type environment where the user has strict
control over the traffic that is generated.
7.2 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).