Wavecom W61PC V7.5.0 - Manual (Page 136)

126  Transmission Modes WAVECOM Decoder W61PC/LAN Manual V7.5
Parameter Value
Frequency range HF
Operation modes Full-duplex
Modulation FSK
Symbol rate 100 Bd, variable 30-650 Baud
Receiver settings DATA, CW, LSB or USB
Input format(s) AF, IF
Additional Info ITA-2 with 4-bit parity
CIS-11 operates at a Symbol rate of 100 Bd on the radio link.
Synchronization for the CIS-11 mode is started with the selection of a baud rate. An AUTO start causes
the automatic determination of the frequency shift and baud rate to be executed first. The signal polarity
(USB or LSB sidebands) is automatically detected.
The CIS-11 data format is 11 bits wide. Data bits 1 - 5 contain the M2 character. The data bits are ar-
ranged 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 bina-
ry 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-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 inter-
leaves two channels into a frame of 14 bits.