Technical data

PAGE 67
Interfaces
A2.9 Extension Bus (internal data bus and control bus)
The Extension Bus socket is used for the cascade connection of single MAGIC
ISDN Telephone Hybrids. This function is not used for the MAGIC Triple
ISDN Telephone Hybrid. The system can be upgraded at any time.
TAB. 19 PIN ASSIGNMENT: EXTENSION BUS-INTERFACE
connector: Extension Bus (SUB-D, 25-pole, male)
Port Signal Electrical Characteristics
1 Shield Data Rate:
64kbit/s up to 2.048Mbit/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
2TXaTransmit Data
3CaControl
4RXaReceive Data
5CLK48a
a
Clock 256×48 kHz
a Is only used if more than four units of a system are connected together.
6 CLKa Clock Receive
7
8GNDGround
9TXbTransmit Data
10 Cb Control
11 RXb Receive Data
12 CLK48b Clock 256×48 kHz
13 CLKb Clock Receive
14 CTa Control RS485 Bus
15 CTb Control RS485 Bus
16 C_DATAa RS485 Bus
17 C_DATAb RS485 Bus
18 RXD_Va Receive_D_Valid
19 RXD_Vb Receive_D_Valid
20 TXD_Va Transmit_D_Valid
21 TXD_Vb Transmit_D_Valid
22 FSa Frame_Sync
23 FSb Frame_Sync
24 CLK48a Clock 256×48 kHz
25 CLK48b Clock 256×48 kHz
113
14
25