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CHAPTER 6 NDA-24300
Page 404
Issue 1
SYSTEM OPERATIONS
7.1 Transmission Data to SMDR Equipment
(1) Transmission Format
As seen in the figure below, the basic information to be transmitted (Transmission Message) is a block
which begins with Start of Text (STX) and ends with End of Text (ETX). When the call ends, the whole
contents of this information is transmitted to the SMDR equipment.
(2) Transmission Message
One transmission message consists of 128 bytes of data. Each byte represents by ASCII codes the data to
be transmitted (Refer to Table 6-3). The contents of the data to be transmitted vary with the kind of call,
but the first byte is always transmitted by ASCII code K (4B hex.). The second byte to be transmitted is
the data which specifies the kind of call.
Note:
In case the Fusion service is involved, the message can consist of more than 128 byte data.
Figure 6-14 shows the transmission message of an outgoing call. Figure 6-15 shows the transmission mes-
sage of an incoming call. Also, Figure 6-16 shows the transmission message of a station-to-station call.
STX: START OF TEXT
ETX: END OF TEST
SA: SYSTEM ADDRESS
UA: UNIT ADDRESS
S
T
X
S
A
U
A
E
T
X
TRANSMISSION MESSAGE