01 tt2510eu01al

18
Application of Plesiochronous Multiplex Systems Siemens TT2510EU01AL_01 1 Contents 1 Introduction 3 2 Digital Signal Hierarchies 7 2.1 Multiplex Hierarchy (CEPT) 8 2.2 Multiplex Hierarchy PCM24 10 3 Connecting Options for the Digital Multiplex Systems 13 Application of Plesiochronous Multiplex Systems

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Page 1: 01 Tt2510eu01al

Application of Plesiochronous Multiplex Systems Siemens

TT2510EU01AL_011

Contents

1 Introduction 3

2 Digital Signal Hierarchies 7

2.1 Multiplex Hierarchy (CEPT) 8

2.2 Multiplex Hierarchy PCM24 10

3 Connecting Options for the Digital Multiplex Systems 13

Application of Plesiochronous MultiplexSystems

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Siemens Application of Plesiochronous Multiplex Systems

TT2510EU01AL_012

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Application of Plesiochronous Multiplex Systems Siemens

TT2510EU01AL_013

1 Introduction

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Siemens Application of Plesiochronous Multiplex Systems

TT2510EU01AL_014

Digital multiplexers are applied wherever a high transmission capacity with effectiveuse of transmission paths to be realized.

The basic idea of multiplexing is the time-interleaving of digital signals of differentsources i order to form a common signal with a bitrate which is correspondinglyhigher (multiplex process). On the system's receiving side the appropriate separatesignals are reobtained from the sum signal (demultiplex process). This means thatthe original digital signals of the multiplexed signal sources are available again at theoutput of such a system.

Example:

The output signals of four PCM30 systems are combined to a signal of 8 Mbit/s andtransmitted via a common transmission path to the receiving side (multiplexprocedure).

On the receiving side the sum signal is then distributed to the corresponding input ofPCM30 systems (demultiplex procedure).

In this example only one direction of transmission is shown.

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Application of Plesiochronous Multiplex Systems Siemens

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PCM 30

TX

PCM 30

TX

PCM 30

TX

PCM 30

TX

MUX

2/8

PCM 30

RX

PCM 30

RX

PCM 30

RX

PCM 30

RX

DMX

2/8

8 Mbit/s

2 Mbit/s

2 Mbit/s

2 Mbit/s

2 Mbit/s

2 Mbit/s

2 Mbit/s

2 Mbit/s

2 Mbit/s

Fig. 1

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Siemens Application of Plesiochronous Multiplex Systems

TT2510EU01AL_016

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Application of Plesiochronous Multiplex Systems Siemens

TT2510EU01AL_017

2 Digital Signal Hierarchies

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Siemens Application of Plesiochronous Multiplex Systems

TT2510EU01AL_018

2.1 Multiplex Hierarchy (CEPT)

Stage:

0 1 2 3 4 5

64 kbit/s channels:

1 30 120 480 1920 7680

Code:

Binary HDB3 HDB3 HDB3 CMI CMI

Bit rate (kbit/s):

64 2048 8448 34368 139264 564992

The European plesiochronous digital hierarchy (CEPT-standard) is based on a 2048kbit/s digital signal (stage 1) which may come for example from a PCM30 system, adigital exchange or from any other device in accordance with this interface norm(standard). Starting from this signal the next higher hierarchies are formed, eachhaving a transmission capacity which is four times the previous one.

The multiplying factor for the bitrates is greater than four, as for each hierarchy leveladditional bits for pulse frame generation and other additional information areinserted.

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Application of Plesiochronous Multiplex Systems Siemens

TT2510EU01AL_019

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2

8

DIV

PCM 30

DSMX

Bitrate

Sources

2 Mbit/s 8 Mbit/s 34 Mbit/s 140 Mbit/s 565 Mbit/s

1

2

3

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8

34

34

140

140

565

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1

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3

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1

2

3

4DK Vt2

Fig. 2

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Siemens Application of Plesiochronous Multiplex Systems

TT2510EU01AL_0110

2.2 Multiplex Hierarchy PCM24

The plesiochronous hierarchy used in USA and Japan is based on a 1544 kbit/sdigital signal (PCM24). From the table below the structure of superordinate hierarchylevels can be seen.

Only the CEPT-hierarchy will be dealt with in the following.

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Application of Plesiochronous Multiplex Systems Siemens

TT2510EU01AL_0111

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Number of 64 kbit/s channels

24

96

480 (Japan)

672 (USA)

1440 (Japan)

4032 (USA)

Bit rate kbit/s

1.544

6.312

32.064

44.736

97.728

274.176

Factor

-

4

5

7

3

6

Fig. 3

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TT2510EU01AL_0112

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Application of Plesiochronous Multiplex Systems Siemens

TT2510EU01AL_0113

3 Connecting Options for the Digital MultiplexSystems

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Siemens Application of Plesiochronous Multiplex Systems

TT2510EU01AL_0114

Each multiplexer normally has

� 4 inputs/outputs for the lower hierarchy level (Tributaries), and

� one input/output for the higher hierarchy level. As to Siemens systems, the lowerhierarchy level is termed F2-side (secondary side), the higher one F1-side(primary side).

The inputs/outputs 1 to 4 can be connected with any type of system which is inaccordance with the corresponding CCITT interface conditions.

Some examples for the connection of the individual multiplexers are represented onthe following pages.

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Application of Plesiochronous Multiplex Systems Siemens

TT2510EU01AL_0115

Connecting Options for the Multiplex System 2/8 Mbit/s

DE

DSMX-

64 k/2

MX-

MStD

PCM 30 1

2

3

4

1

2

3

4

DSMX

2/8

DSMX

8/34

LE 8cable link

8 Mbit/s

DRS

2x8/

15000

2

1

2 Mbit/s 8 Mbit/s 34 Mbit/sDigital Interfaces

LE 2

F1 F2

Side Side

F1 F2

Side Side

F1

Side

radio relay link

2x8 Mbit/s

cable link

2 Mbit/s

PCM30 PCM multiplex equipment for 30 telephone signals (PCM30)MX-MStD Multiplex equipment of the PCM audio frequency systemDSMX 64 K/2 Digital multiplex equipment for 64 kbit/s signalsDE Digital exchangeLE Line terminating equipmentDRS Digital radio relay system

Fig. 4

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Siemens Application of Plesiochronous Multiplex Systems

TT2510EU01AL_0116

Connecting Options for the Digital Multiplex Device DSMX 8/34 Mbit/s

1

2

3

4

1

2

3

4

DSMX

8/34

DSMX

34/140

LE 34cable link

34 Mbit/s

DRS

34/...

2

1

2 Mbit/s 8 Mbit/s 34 Mbit/sDigital Interfaces

F1 F2

Side Side

F1 F2

Side Side

radio relay link

34 Mbit/s

cable link2 Mbit/s

DRS

2x8/

15000

DSMX

2/8

1

2

3

4

140 Mbit/s

LE 8

DSMX Digital multiplex equipmentLE Line terminating equipmentDRS Digital radio relay system

Fig. 5

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Application of Plesiochronous Multiplex Systems Siemens

TT2510EU01AL_0117

Connecting Options for the Digital Multiplex Inset DSMX 2/34 Mbit/s

DRS

2/...

MStD

LE 2

PCM 30 1

2

3

4

DSMX

34/140

LE 34cable link

34 Mbit/s

DE

DRS34/...

radio relay

link34 Mbit/s

cable link2 Mbit/s

2 M

2 M

2 M

2 M

DSMX 2/34

case 1

DSMX 2/34

case 2

radio relaylink

2 Mbit/s

DSMX2/8

2 Mbit/s 8 Mbit/s 34 Mbit/s 140 Mbit/sinterfaces

DRS

2x8/15000

2 M

2 M

8 M

8 M

1

4

16

1

4

8

PCM30 PCM multiplex equipment for 30 telephone signals (PCM30)DSMX Digital multiplex insetLE Line terminating equipmentMStD PCM-audio-frequency systemDRS Digital radio relay systemDE Digital exchangeCase 1 Four slide-in units, quadruple F2-interface 2-Mbit/s- (2M) and four 2/8-Mbit/s-multiplex

slide-in unitsCase 2 Combined equipment: alternative variant to case 1, two slide-in units F2-interface 8

Mbit/s (8M)

Fig. 6

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Siemens Application of Plesiochronous Multiplex Systems

TT2510EU01AL_0118

Connecting Options for the Digital Multiplex Inset DSMX 34/140 Mbit/s

1

2

3

4

DSMX

2/8

LE 140

cable link

565 Mbit/s

DRS

140

1

.

.

.

16

DSMX

2/34

1

2

3

4

DSMX

8/34

1

2

3

4

DSMX

34/140

1

2

3

4

DSMX

140/565 LE 565

TV

34

TV

140

LE 34

DRS

34/...

radio relay

link

140 Mbit/s

cable link

140 Mbit/s

cable link

34 Mbit/s

radio relay

link

34 Mbit/s

2 Mbit/s 8 Mbit/s 34 Mbit/s 140 Mbit/s 565 Mbit/s

DSMX Digital multiplex equipment

LE Line terminating equipment

DRS Digital radio relay system

TV34 TV code 34 Mbps

TV140 TV code 140 Mbps

DSMX Digital multiplex equipmentLE Line terminating equipmentDRS Digital radio relay systemTV34 TV code 34 MbpsTV140 TV code 140 Mbps

Fig. 7