WAVECOM Decoder W74PC, W-PCI/e, W-CODE, W-CLOUD Manual V9.1.0 Transmission Modes
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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.
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.
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.
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