Br-6028 – Wavecom W74PC V8.7.0 User Manual
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134
Transmission Modes
WAVECOM Decoder W74PC, W-PCI/e, W-CODE, W-CLOUD Manual V8.7.0
C
A
T
F
N
C
String
0
0
0
1
1
1
RepOFF
1
0
0
1
1
1
Status8
0
1
0
1
1
1
RejAck
1
1
0
1
1
1
Reser8
0
0
1
1
1
1
ExtAdr
1
0
1
1
1
1
Status16
0
1
1
1
1
1
MobDis
1
1
1
1
1
1
Cust8
Depending on the OMC code, the address word can be followed by one or more data words. Four such
cases exist:
Telephone Call
One or more data words containing a telephone number are appended to the address word. The telephone
number is displayed in the decoder output.
External Addressing
A datagram for external addressing consists of two address words. The first address word carries the
transmitter address including the transmitter regional code and the second address word carries the re-
ceiver address including the receiver regional code.
Short Data Transfer
A short data transfer is very similar to the transmission of a telephone number. The address word is fol-
lowed by some data words. The display format of the decoded information can be switched between bina-
ry, hexadecimal, and text data. Text data is displayed in ASCII format.
Dialog Data Transfer
In case of dialog data transfer the BIIS address word is followed by a HDLC control block. This control
block is analyzed by the decoder module and the contents are displayed as plain text.
The control block consists of an address, a command-response bit, a control field indicating the frame type
and a 32-bit parameter field in hexadecimal format.
I-frames and S-frames contain a receive sequence number N(R) or send sequence number N(S). The usu-
al HDLC commands and responses are displayed in abbreviated form.
Data words following the HDLC control block can be displayed in binary or hexadecimal format.
In the case of system control data (OMC = 011000), a 6-bit custom code is transmitted instead of trans-
mit and receive addresses.
Further information about the OMC coding, regional codes and the HDLC protocol may be found in the
ETSI-standard ETS 300 230.
For validation of the code words, CRC and parity checks are used. If the CRC or the parity is incorrect the
decoder output is displayed in red.
BR-6028
BR-6028 is a VFT (Voice Frequency Telegraph) frequency and time diversity modem using 7 data chan-
nels. It is sometimes also known as “BARRIE” or “USA-7” channel modem.