A4.9 Extension Bus (Internal Data Bus And Control Bus) - AVT Magic Touch Operating Manual

I n t e r f a c e s
1
14
P A G E 1 5 0
A4.9 Extension Bus (internal data bus and control bus)
The Extension Bus socket is used for the cascade connection of single MAGIC
ISDN Telephone Hybrids. The system can be upgraded at any time.
TAB. 24
13
Connector: Extension Bus (SUB-D, 25-pole)
25
Port
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
PIN ASSIGNMENT: EXTENSION BUS INTERFACE
Signal
Shield
TXa Transmit Data
Ca Control
RXa Receive Data
CLK48a Clock 256x48-kHz
CLKa Clock Receive
GND GND
TXb Transmit Data
Cb Control
RXb Receive Data
CLK48b Clock 256x48-kHz
CLKb Clock Receive
CTa Control RS485-Bus
CTb Control RS485-Bus
C_DATAa Data RS485-Bus
C_DATAb Data RS485-Bus
RXD_Va Receive Data Valid
RXD_Vb Receive Data Valid
TXD_Va Transmit Data Valid
TXD_Vb Transmit Data Valid
FSa Frame Sync
FSb Frame Sync
reserved
reserved
Electrical characteristics
Data rate:
64-kbit/s up to 2,04-Mbit/s
Level: V.11, symmetrical
Protocol for RS-485:
1 Start bit
8 Data bits
1 Parity bit
1 Stop bit
Data rate: 19200 Bd