Cis-14; Cis-36 - Wavecom W40PC Manual

The CIS-11 data format is 11 bits wide. Data bits 1 - 5 contain the M2 character. The data bits
are arranged in reverse order if compared to normal M2 systems. Bits 6 and 7 specify the
system state as well as the alphabet.
Bits 8 - 11 handle error detection. The four test bits allow the position of a bit in error to be
computed and then to be corrected. The value of the parity bits is obtained by calculating the
modulo-2 sum of the binary weights of the respective information bits.
To maintain synchronization between the two duplex stations, both transmitters operate
continuously and transmit idle characters if no traffic is transferred.

CIS-14

Parameter
Frequency range
System
Baudrate
Modulation
Receiver settings
Signal source(s)
Alphabet
CIS-14 employs a radio channel speed of 96 Baud.
Synchronizing to a CIS-14 signal may be initiated by selecting a baudrate or "Auto". Starting
"Auto" will automatically determine shift, center frequency and baud rate.
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 interleaves two channels into a frame of 14 bits.
The two first bits of the multiplex identify the channel state as IDLE or TRAFFIC. Then two
bit interleaved M2 data codewords follow. The last two bits are parity bits used for error
detection. Parity is calculated 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 unavoidable detection errors.

CIS-36

Parameter
Frequency range
System
Tone duration
Baudrate
Modulation
Receiver settings
Signal source(s)
Alphabet
CIS-36 is operating with speeds of 10, 20 or 40 baud which is equivalent to tone duration of
100, 50 or 25 ms.
Transmissions in CIS-36 are mostly in Russian using an ITA-2 alphabet. CIS-36 is a full
duplex mode with two transmission frequencies, but can also be used in simplex mode.
WAVECOM Decoders v6.15 W40PC, W41PC, W51PC
Value
HF
CIS, DUPLEX system
96.0 Baud
SSB or DIRECT-FSK
CW, LSB or USB
AF, HF or IF
Cyrillic third shift with parity
Value
HF
CIS, MFSK System
25, 50 or 100 ms
10, 20 or 40 Baud
SSB or DIRECT-FSK
CW, LSB or USB
AF, HF or IF
M2
Transmission Modes • 129