Advertisement
INTERFACE
V.24
KEYPAD
LAMPS &
DISPLAY
MEMORY
HANDSET
INTERFACE
Figure 2-5 Data port configuration within SOPHO-SET 308, S375 D, P375 D and P370 D.
2.3.1. Interface Control and Data Rate Adaption
There are two systems of data transfer:
• With Data Rate Adaption
If the transmission speed between the two DTEs is less than 64 kbps then the data rate
must be adapted. Also some of the control signals of the interface between the DCE and
the DTE can be transferred. The two DCEs use a frame structure to communicate with
each other. The user data and interface control signals are located in fixed positions within
that frame. The data rate adaption methods supported by SOPHO-SET, SOPHO-LAM
and LAM are summarised below.
16
CONTROL
DATA RATE
ADAPTION
µP
ANALOGUE
AUDIO
DIGITAL
CONVERTOR
64 kbps
B-channel
16 kbps
MULTIPLEXER
D-channel
64 kbps
B-channel
Keyboard dialling
AT command dialling
V.25bis dialling
Data port programming
2B+D
ECHO
152 kbps
CANCELLER
(SOPHO-SET 308
and
S375 D only)
Advertisement
