Cis-12, Cis-14, Cis-36 – Wavecom W74PC V8.7.0 User Manual
Page 150
140
Transmission Modes
WAVECOM Decoder W74PC, W-PCI/e, W-CODE, W-CLOUD Manual V8.7.0
CIS-12
CIS-12 is a multi-channel system using 12 channels each modulated with 120 Bd DBPSK or DQPSK. Each
channel has a separation of 200 Hz to neighbor channels. An unmodulated pilot carrier is placed at +3300
Hz from the suppressed carrier.
Parameter
Value
Frequency range
HF
Operation modes
12-Channel-PSK
Modulation
DBPSK or DQPSK
Symbol rate
120 Bd
Center frequency
1800
Receiver settings
DATA, CW, LSB or USB
Input format(s)
AF, IF
Additional Info
HEX and ASCII output are provided
Output may be selected as Hex or ASCII.
CIS-14
CIS-14 is a full-duplex system using two frequencies.
As in the case for other time multiplex modes (TDM), e.g., ARQ-M2-242 and ARQ-M2-342, CIS-14 bit in-
terleaves two channels into a frame of 14 bits.
Parameter
Value
Frequency range
HF
Operation modes
Duplex ARQ TDM
Modulation
FSK
Symbol rate
96.0 Bd
Receiver settings
DATA, CW, LSB or USB
Input format(s)
AF, IF
Additional Info
Cyrillic third shift with parity
CIS-14 employs a radio channel Symbol rate of 96 Baud.
Synchronizing to a CIS-14 signal may be initiated by selecting a baud rate or Auto. Starting Auto will au-
tomatically determine shift, center frequency and baud rate.
The two first bits of the multiplex frame identify the channel state as IDLE or TRAFFIC. Then two bit inter-
leaved M2 data code words follow. The last two bits are parity bits used for error detection. Parity is calcu-
lated depending on the position of ‘1’ bits.
In Code Check the simple data format of CIS-14 with only two parity bits may unfortunately lead to una-
voidable detection errors.
CIS-36
CIS-36 in error-correcting traffic mode is using a horizontal line- and vertical block-error-detection. Each
block has ten data frames and a parity frame. Each data frame has five data characters and one parity
character. In case an error is detected the receiving station starts ask for a frame repetition (NAK instead
of ACK) from the last complete and correctly received frame.