Technical data

PAGE 150
Interfaces
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 PIN ASSIGNMENT: EXTENSION BUS INTERFACE
Connector: Extension Bus (SUB-D, 25-pole)
Port Signal Electrical characteristics
1Shield 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
2 TXa Transmit Data
3Ca Control
4RXaReceive Data
5 CLK48a Clock 256x48-kHz
6 CLKa Clock Receive
7
8GNDGND
9 TXb Transmit Data
10 Cb Control
11 RXb Receive Data
12 CLK48b Clock 256x48-kHz
13 CLKb Clock Receive
14 CTa Control RS485-Bus
15 CTb Control RS485-Bus
16 C_DATAa Data RS485-Bus
17 C_DATAb Data RS485-Bus
18 RXD_Va Receive Data Valid
19 RXD_Vb Receive Data Valid
20 TXD_Va Transmit Data Valid
21 TXD_Vb Transmit Data Valid
22 FSa Frame Sync
23 FSb Frame Sync
24 reserved
25 reserved
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14
25