Rum-fec – Wavecom W61PC V7.5.0 User Manual

Page 217

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WAVECOM Decoder W61PC/LAN Manual V7.5

Transmission Modes

207

The decoder output is divided in signaling information (call signs with SSIDs, package-identifier and AX.25
control word) and data. It is possible to represent the data as ITA5-US and HEX.

Further description to the signaling information can be found in the AX.25 Link Access Protocol for Ama-
teur Packet Radio.

The package-identifier specifies the used layer 3 protocol.

In the following table, all possible package identifiers are given:

Package-Identifier PID

Hexadecimal
value PID

binary value

Layer 3 Protocol

**

xx01xxxx

AX.25 layer 3 implemented

**

xx10xxxx

AX.25 layer 3 implemented

0x10

00010000

ISO 8208/CCITT X.25 PLP

0x06

00000110

Compressed TCP/IP packet. Van Jacobson (RFC 1144)

0x07

00000111

Uncompressed TCP/IP packet. Van Jacobson (RFC 1144)

0x08

00001000

Segmentation fragment

0xc3

11000011

TEXNET datagram protocol

0xc4

11000100

Link Quality Protocol

0xca

11001010

Appletalk

0xcb

11001011

Appletalk ARP

0xcc

11001100

ARPA Internet Protocol

0xcd

11001101

ARPA Address resolution

0xce

11001110

FlexNet

0xcf

11001111

NET/ROM

0xf0

11110000

No layer 3 protocol implemented.

0xff

11111111

Escape character. Next octet contains more Level 3 protocol information.

0x08

00001000

Escape character. Next octet contains more Level 3 protocol information.

RUM-FEC

Parameter

Value

Frequency range

HF

Operation modes

Broadcast/Simplex FEC

Modulation

FSK

Symbol rate

164.5 and 218.3 Bd, variable 30-650 Bd

Receiver settings

DATA, CW, LSB or USB

Input format(s)

AF, IF

Additional Info

16 Bit redundancy

RUM-FEC operates at symbol rates of 164.5 and 218.3 Bd on the radio link.

The HNG-FEC and RUM-FEC modes are technically very similar. RUM-FEC alphabet has a codeword length
of 16 bits where each of the 32 used bit combinations corresponds to an ITA-2 character.

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