01 tt2510eu01al
DESCRIPTION
01 ApplicationTRANSCRIPT
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
Siemens Application of Plesiochronous Multiplex Systems
TT2510EU01AL_012
Application of Plesiochronous Multiplex Systems Siemens
TT2510EU01AL_013
1 Introduction
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.
Application of Plesiochronous Multiplex Systems Siemens
TT2510EU01AL_015
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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
Siemens Application of Plesiochronous Multiplex Systems
TT2510EU01AL_016
Application of Plesiochronous Multiplex Systems Siemens
TT2510EU01AL_017
2 Digital Signal Hierarchies
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.
Application of Plesiochronous Multiplex Systems Siemens
TT2510EU01AL_019
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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
4
8
34
34
140
140
565
1
2
3
4
1
2
3
4
1
2
3
4DK Vt2
Fig. 2
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.
Application of Plesiochronous Multiplex Systems Siemens
TT2510EU01AL_0111
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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
Siemens Application of Plesiochronous Multiplex Systems
TT2510EU01AL_0112
Application of Plesiochronous Multiplex Systems Siemens
TT2510EU01AL_0113
3 Connecting Options for the Digital MultiplexSystems
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.
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
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
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
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