User's Manual

545C Operations Manual

02/10/2012 Prerelease DCN 00001789-A

packet sequence number, total number of packets and first destination ID

code). If the message has only one destination, segment 1 is the start of

the actual text. If there are multiple destinations, segment(s) 1, . . . n

contain the remaining destination codes, 7 destination codes per segment.

The text starts on the next segment after the last destination code.

Network Connectivity Tables

SNP,NUP Number of receptions for neighbor-up

SNP,NDOWN Number of minutes for Master neighbor down

SNP,RDOWN Number of minutes for Remote neighbor down

Network connectivity tables are automatically created and updated each

time a Master detects a new neighbor unit or times out an existing unit.

The NUP parameter gives the number of transmissions that must be

received in one minute to declare a new neighbor. The NDOWN parameter

gives the number of minutes with no receptions to time out a Master

neighbor. The RDOWN parameter gives the number of minutes to time out

a Remote neighbor. Setting NDOWN or RDOWN to “0” disables the feature

(i.e., never declare neighbors down). The NDOWN parameter can also be

set for the number of times a Station attempts to communicate with a

neighbor before attempting to talk to another Station.

Congestion Control

SNP,OTL Outstanding text limit

The OTL parameter specifies the maximum number of messages that will

be transmitted while waiting for ETEs. Limiting messages, as cars are

limited to entering the freeway at rush hour, tends to reduce congestion

and memory buffer usage in the network and reduce the number of retries

that happen as a result. Sending messages one at a time does not take

advantage of the overlap caused by the ETE needing to come back through

the network and does not take advantage of an occasional large burst that

can significantly improve throughput.

Network Control Messages

SNP,CONNP Priority for connectivity messages

SNP,ETEAP Priority for end-to-end-ack messages

SNP,FLOODP Priority level to initiate “flood-routing”

SNP,DATAP Priority for data reports