Rum-Fec - Wavecom W74PC Manual

Hexadecimal binary value
value PID
** xx10xxxx
0x10 00010000
0x06 00000110
0x07 00000111
0x08 00001000
0xc3 11000011
0xc4 11000100
0xca 11001010
0xcb 11001011
0xcc 11001100
0xcd 11001101
0xce 11001110
0xcf 11001111
0xf0 11110000
0xff 11111111
0x08 00001000

RUM-FEC

Parameter
Frequency range
Operation modes
Modulation
Symbol rate
Receiver settings
Input format(s)
Additional Info
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.
The RUM-FEC alphabet is designed to obtain a maximum Hamming distance for error detection and has
deep interleaving. The actual ITA-2 alphabet is not contained in the code table. As in HNG-FEC error cor-
rection is performed by table look-up of the bit pattern (character) closest resembling the character in er-
ror.
RUM-FEC has a bit interleaving of 128 bits, each new character starting at intervals of 16 bits. The soft-
ware synchronizes to traffic as well as idle bit patterns.
Error correction may be enabled or disabled using the ECC item in the Options menu.
In RUM-FEC mode the signal polarity (sideband) can be manually selected by toggling the Polarity item in
the Demodulator menu. If polarity changes during a transmission, synchronization will not be lost.
230  Transmission Modes
Layer 3 Protocol
AX.25 layer 3 implemented
ISO 8208/CCITT X.25 PLP
Compressed TCP/IP packet. Van Jacobson (RFC 1144)
Uncompressed TCP/IP packet. Van Jacobson (RFC 1144)
Segmentation fragment
TEXNET datagram protocol
Link Quality Protocol
Appletalk
Appletalk ARP
ARPA Internet Protocol
ARPA Address resolution
FlexNet
NET/ROM
No layer 3 protocol implemented
Escape character. Next octet contains more Level 3 protocol information
Escape character. Next octet contains more Level 3 protocol information.
Value
HF
Broadcast/Simplex FEC
FSK
164.5 and 218.3 Bd, variable 30-650 Bd
DATA, CW, LSB or USB
AF, IF
16 Bit redundancy
WAVECOM Decoder W74PC, W-PCI/e, W-CODE, W-CLOUD Manual V9.1.0