PEB2084 データシートの表示（PDF） - Siemens AG

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PEB2084

ICs for Communications Quadruple Transceiver for S/T Interface QUAT-S

Siemens AG 

PEB 2084

125 µs

FSC

DCL

DU IOM R CH0 CH1

CH2

CH3

CH4

CH5

CH6

CH7

CH0

DD IOM R CH0 CH1

CH2

CH3

CH4

CH5

CH6

CH7

CH0

B1

B2

MONITOR

D

C/I

MM

RX

ITD04319

Figure 7

Multiplexed Frame Structure of the IOM-2 Interface in LT Mode with 2048 kbit/s

Data Rate

Each IOM ISDN channel consists of a total of 32 bits, or four octets:

B1 (8 bits) + B2 (8 bits) + D (2 bits) plus 14 bits for intercommunication.

• Two 8-bit B1 and B2 channels for voice and data communication with a data rate of

64 kbit/s each,

• One 8-bit monitor channel for transferring maintenance information,

• One 2-bit D-channel for data transfer (e.g. signalling) with a data rate of 16 kbit/s

• Four command/indication (C/I) bits for controlling layer-1 functions.

• Two bits for handling the monitor channel: MR an MX (hand shake control).

8 bits

B1 channel

8 bits

B2 channel

8 bits

Monitor channel

2

D ch.

4 bits

11

Command/ MR MX

Indication

The user data rate is 144 kbit/s (B1 + B2 + D).

Monitor Channels

The monitor channel is used to convey message oriented local functions such as

software programming or access to internal registers via a layer-2 controller (ICC,

ELIC,…). There is a defined handshake procedure between the monitor channel

transmitter and the receiver in order to ensure a safe data transfer over the IOM-2

interface.

Semiconductor Group

19

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