Slide 5-1

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LZU 103 506

Switching and SignalingSwitching and Signaling

Slide 5-2

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LZU 103 506

Main System Parts

Subscribersignaling and

switchingequipment

Groupswitchingnetwork

Trunk &signaling.

equip-ment

Trunks

Remotesubsc.switch

Terminalequip-ment

Regionalprocessors

RegionalprocessorsEMRP

SupportprocessorsCentral

processor

In / Out

0038B

Slide 5-3

EN

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D 1

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LZU 103 506

Section 1 Objectives

Upon completion of this section, the student will be able to:

• Describe the structure of SSS and the capacities of the Line SwitchModules and the Extension Module Groups.

• Describe the main operating functions of the Line Switch Module in theSubscriber Switching Subsystem (SSS).

• Describe how Extension Module Groups are used in Remote and LocalSubscriber Switch applications.

• Describe the different modes of operation associated with the ExtensionSwitch Module

• List the basic steps involved with call flow through the local and remotesubscriber stage.

• Describe the Special Equipment Coin Box Magazine

Slide 5-4

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LZU 103 506

Main Functions of SSS

• Setup and release of call connections

• Supervision of the state of subscriber lines

• Analog-to-digital conversion

• Subscriber line signaling, such as ringing current

Slide 5-5

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LZU 103 506

Extension Module Groups (EMGs)

LSM-0

LSM-15

TSB

EMG

GS

EMRPB

0

127

2047

EMG

SSS0

2047 EMG

EMG

EMG

GS

TRUNKDEVICES

SSS0075

Slide 5-6

EN

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D 1

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LZU 103 506

Functions of the LSM

BISS

TSC

CLD/CLS

EMTS

KRC

ABS

0 1 2 3

L I B s

14 15

SLCT

ETB/JTC

EMRP

ETB/JTC

LLR

REU

POU

0

2

4

6

1

3

5

7

TIPRING

EMRP Bus

Address plug

Cable toMDFTSB A & B

LSM

Slide 5-7

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LZU 103 506

Units of the LSM

BISS

TSC

CLD/CLS

EMTS

KRC

ABS

0 1 2 3

L I B s

14 15

SLCT

ETB/JTC

EMRP

ETB/JTC

LLR

REU

POU

0

2

4

6

1

3

5

7

TIPRING

EMRP Bus

Address plug

Cable toMDFTSB A & B

LSM

Slide 5-8

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LZU 103 506

Units in a ACA3 LSM Magazine

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ !T!K!A!L!L!L!L!L!L!L!L!L!L!L!L!L!L!L!L!S!E!E!E!E!R!P! !S!R!B!I!I!I!I!I!I!I!I!I!I!I!I!I!I!I!I!L!T!T!T!M!E!O! !W!3!S!C!C!C!C!C!C!C!C!C!C!C!C!C!C!C!C!C!B!B!B!R!U!U! ! !C!C! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !T! ! ! !P! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !3! ! ! ! ! ! ! ! ! ! !0!1!2!3!4!5!6!7!8!9!1!1!1!1!1!1! !0!1!2! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !0!1!2!3!4!5! ! ! ! ! ! ! ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Slide 5-9

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LZU 103 506

SubscriberSwitchingSubsystemSSS

KRC

LIB(LIC's)

EMTS

JTC

EMRP

LSM0

SECOB EMRP

SETPL EMRP

SE

SE

SSS-Local

EMG32Channel

EMRP A

RPBC

SSS0010

EMRP B

Slide 5-10

EN

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LZU 103 506

KRC ConnectionLSM

LIB

EMTS

LSM

TSB

LIBEMTS

KRC

Slide 5-11

EN

/FA

D 1

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LZU 103 506

Types of Auxiliary Equipment in SSS

EMRP

EMRP

EMRP

EMRP

STR STR

LIC

SLCT REU

SE

SULT

IOIMExternalAlarms

I/O Device

Slide 5-12

EN

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LZU 103 506

Device Processors in LSM Controlled by EMRP

LIC LIB

DP

LIC LIB

KRCDP

ETBDP

EMTS

DP DP

EMRP

DEVCBDEVCB DEVCB

DEVCB

To/fromcentral software

To/fromGSS

LSM(EM)

0814C

Slide 5-13

EN

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D 1

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LZU 103 506

RemoteSubscriberStage

LIC

EMTSKRC ETB

EMRP

0

127

LSM 0

LIC

EMTSKRC ETB

EMRP

0

127

LSM 1

LIC

EMTSKRC ETB

EMRP

0

127

LSM 2

LIC

EMTSKRC ETB

EMRP

0

127

LSM 3

TSB-B

TSB-A

PCM - line to/from GSSin host office

PCM - line to/from GSSin host office

PCM - line to/from GSSin host office

0812A

Slide 5-14

EN

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LZU 103 506

Signaling Between RSS and CP

EMRP

EMRP

EMRP

ETB

ETB

STR STR

Signals

Signals

EMRPB-A

EMRPB-B

23 8 0... ...

Signals

... ...23 8 0

PCM line

PCM line

ETC

ETC

Signals

SignalsSignals

STC

CP

RPB

GSS

STC

Slide 5-15

EN

/FA

D 1

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LZU 103 506

SSS in Host Office

EMRP

EMRP

EMRP

CP

RPB

GSS

0815A

EMRPB

RPBC RPBC

JTC

JTC

JTC

Slide 5-16

EN

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D 1

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LZU 103 506

Extension Switch Module

EMRP

ETBEMTSKRC

ET

EMRP

ETBEMTSKRC

ET

EMRP

ETBEMTSKRC

ET

IDLC

ANALOG

96SUBSCRIBERS

DIGITALESM-0

ESM-1

ESM-15

81463A

Slide 5-17

EN

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D 1

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LZU 103 506

Operation Mode 1

24Channels

24Channels

24Channels

24Channels

RTET

DDL

DDL

DDL

DDL

DDL

ET

ET

ET

ETProtection Link

T1 Link D

T1 Link C

T1 Link B

T1 Link A

95

0

SubscriberLines

ESM

Slide 5-18

EN

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D 1

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LZU 103 506

Operation Mode 2

24Channels

24Channels

24Channels

24Channels

RT

ET

DDL

Protection Link

T1 Link

95

0

SubscriberLines

ESM

T1 Link

DigitalConcen-

trator2:1

DigitalConcen-

trator2:1

ET

DDL

ET

DDL

Slide 5-19

EN

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LZU 103 506

Operation Mode 3

24Channels

24Channels

24Channels

24Channels

RT

ET

DDL

Protection Link

T1 Link

47

0

SubscriberLines

ESM

T1 Link

Multi-plex1:1 ET

DDL

ET

DDL

Multi-plex1:1

81476A

Slide 5-20

EN

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D 1

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LZU 103 506

ESM Magazine Layout

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |B|T|C|K|S|S|S|S|S|S|S|S|S|S|S|J|J|E|B|P| |I|S|L|R|L|L|L|L|L|L|L|L|L|L|L|T|T|M|O|O| |S|C|D|3|C|C|C|C|C|C|C|C|C|C|C|C|C|R|O|U| |S| | |C|E|D|E|D|E|D|E|D|E|D|B| | |P|S| | | | | | |T|D|T|D|T|D|T|D|T|D|P| | | |T| | | | | | |C|L|C|L|C|L|C|L|C|L|T| | | |E| | | | | | | |C| |C| |C| |C| |C|C| | | |R| | | | | | | | | | | | | | | | | | | | | | | | | | | |A|A|B|B|C|C|D|D|P|P| |0|1| | | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Slide 5-21

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LZU 103 506

SLCT

KR

LIC

EMTS

JTCEMRP03/01

SLCT

KR

LIC

EMTS

JTC

EMRP03/02

SLCT

KR

LIC

EMTS

JTCEMRP03/03

SLCT

LIC

EMTS

EMRP03/16

LSM-1

LSM-0

LSM-2

LSM-15

SETPL EMRPSE

SECOBEMRPSE

GSS

RPBC RPBC

RP BUS

CP-A CP-B

EMG LSS0

TIME SWITCH BUS "B"TIME SWITCH BUS "A"

EMRP BUS "B"EMRP BUS "A"

SSS0014

LocalSubscriberSwitchingStageLSS

Slide 5-22

EN

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LZU 103 506

RemoteSubscriberStage

SLCT

KR

LIC

EMTS

ETB

EMRP03/01

SLCT

KR

LIC

EMTS

ETB

EMRP03/02

SLCT

KR

LIC

EMTS

ETB

EMRP03/03

SLCT

LIC

EMTS

EMRP03/16

LSM-1

LSM-0

LSM-2

LSM-15

SETPL EMRPSE

SECOB EMRPSE

EMG RSS0

EMRP BUS "B"EMRP BUS "A"

STR

STR

T16R

STC STC RP RP

P-BCP-A

T1-24 Channel

T1-24 Channel

T1-24 Channel

ETC

ETC

ETC

T16C

RP BUS

GSS

TIME SWITCH BUS "A"TIME SWITCH BUS "B"

Slide 5-23

EN

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LZU 103 506

Magazine Layout (32 Line)

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ !P!P!D!S!S!D!S!S!D!S!S!D!S!S!E!D!S!S!D!S!S!D!S!S!D!S!S!P! !O!O!E!E!E!E!E!E!E!E!E!E!E!E!M!E!E!E!E!E!E!E!E!E!E!E!E!O! !U!U!V!C!C!V!C!C!V!C!C!V!C!C!R!V!C!C!V!C!C!V!C!C!V!C!C!U! ! ! !P!O!O!P!O!O!P!O!O!P!O!O!P!P!O!O!P!O!O!P!O!O!P!O!O! ! ! ! ! !B!B! !B!B! !B!B! !B!B! ! !B!B! !B!B! !B!B! !B!B! ! ! ! ! !C!C! !C!C! !C!C! !C!C! ! !C!C! !C!C! !C!C! !C!C! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !0!0!2!1!4!6!2!8!1!3!1!1! !4!1!1!5!2!2!6!2!2!7!2!3! ! ! ! ! ! ! ! ! ! ! ! !0! !2!4! ! !6!8! !0!2! !4!6! !8!0! ! ! ! ! !-!-! !-!-! !-!-! !-!-! ! !-!-! !-!-! !-!-! !-!-! ! ! ! ! !1!3! !5!7! !9!1! !1!1! ! !1!1! !2!2! !2!2! !2!3! ! ! ! ! ! ! ! ! ! ! ! !1! !3!5! ! !7!9! !1!3! !5!7! !9!1! ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Slide 5-24

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LZU 103 506

Magazine Layout (16 Line)

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ !P!P!D!S!S!D!S!S!E!D!S!S!D!S!S!C!P! !O!O!E!E!E!E!E!E!M!E!E!E!E!E!E!L!O! !U!U!V!C!C!V!C!C!R!V!C!C!V!C!C!C!U! ! ! !P!O!O!P!O!O!P!P!O!O!P!O!O!T! ! ! ! ! !B!B! !B!B! ! !B!B! !B!B! ! ! ! ! ! !C!C! !C!C! ! !C!C! !C!C! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !0!0!2!1!4!6! !2!8!1!3!1!1!1! ! ! ! ! ! ! ! ! ! ! ! ! !0! !2!4! ! ! ! ! ! !-!-! !-!-! ! !-!-! !-!-! ! ! ! ! ! !1!3! !5!7! ! !9!1! !1!1! ! ! ! ! ! ! ! ! ! ! ! ! ! !1! !3!5! ! ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Slide 5-25

EN

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D 1

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LZU 103 506

SECOB Magazine Layout (16 Line)

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ !P!P!D!S!S!D!S!S!E!D!S!S!D!S!S!C!P! !O!O!E!E!E!E!E!E!M!E!E!E!E!E!E!L!O! !U!U!V!C!C!V!C!C!R!V!C!C!V!C!C!C!U! ! ! !P!O!O!P!O!O!P!P!O!O!P!O!O!T! ! ! ! ! !B!B! !B!B! ! !B!B! !B!B! ! ! ! ! ! !C!C! !C!C! ! !C!C! !C!C! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !0!0!2!1!4!6! !2!8!1!3!1!1!1! ! ! ! ! ! ! ! ! ! ! ! ! !0! !2!4! ! ! ! ! ! !-!-! !-!-! ! !-!-! !-!-! ! ! ! ! ! !1!3! !5!7! ! !9!1! !1!1! ! ! ! ! ! ! ! ! ! ! ! ! ! !1! !3!5! ! ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Slide 5-26

EN

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D 1

09 0

015

LZU 103 506

SECOB Magazine Layout (32 Line)

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ !P!P!D!S!S!D!S!S!D!S!S!D!S!S!E!D!S!S!D!S!S!D!S!S!D!S!S!P! !O!O!E!E!E!E!E!E!E!E!E!E!E!E!M!E!E!E!E!E!E!E!E!E!E!E!E!O! !U!U!V!C!C!V!C!C!V!C!C!V!C!C!R!V!C!C!V!C!C!V!C!C!V!C!C!U! ! ! !P!O!O!P!O!O!P!O!O!P!O!O!P!P!O!O!P!O!O!P!O!O!P!O!O! ! ! ! ! !B!B! !B!B! !B!B! !B!B! ! !B!B! !B!B! !B!B! !B!B! ! ! ! ! !C!C! !C!C! !C!C! !C!C! ! !C!C! !C!C! !C!C! !C!C! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !0!0!2!1!4!6!2!8!1!3!1!1! !4!1!1!5!2!2!6!2!2!7!2!3! ! ! ! ! ! ! ! ! ! ! ! !0! !2!4! ! !6!8! !0!2! !4!6! !8!0! ! ! ! ! !-!-! !-!-! !-!-! !-!-! ! !-!-! !-!-! !-!-! !-!-! ! ! ! ! !1!3! !5!7! !9!1! !1!1! ! !1!1! !2!2! !2!2! !2!3! ! ! ! ! ! ! ! ! ! ! ! !1! !3!5! ! !7!9! !1!3! !5!7! !9!1! ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Slide 5-27

EN

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D 1

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LZU 103 506

Section 1 Objectives Review

Upon completion of this section, the student will be able to:

• Describe the structure of SSS and the capacities of the Line SwitchModules and the Extension Module Groups.

• Describe the main operating functions of the Line Switch Module in theSubscriber Switching Subsystem (SSS).

• Describe how Extension Module Groups are used in Remote and LocalSubscriber Switch applications.

• Describe the different modes of operation associated with the ExtensionSwitch Module

• List the basic steps involved with call flow through the local and remotesubscriber stage.

• Describe the Special Equipment Coin Box Magazine

Slide 5-28

EN

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LZU 103 506

Section 2 Objectives

Upon completion of this lesson, the student will be able to:

• Describe the main functions of the Group Switching Subsystem (GSS)• List the main components of the Group Switching Subsystem (GSS).• Explain the operating principle of the switching network when connecting

and disconnecting a speech path between two subscribers.

• Describe digital paths and how they are connected to the Time SwitchModule (TSM).

• Explain why the switching network is duplicated as plane A and plane B.• Explain the reason for having three clock modules and the importance of

network synchronization.

Slide 5-29

EN

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LZU 103 506

Main Functions of GSS

• Through-connection of a call

− Digital switching from one PCM link to another PCM link

− Connection within the SSS (intraoffice)

− Connection between SSS and TSS (interoffice)

• Clock maintenance and timing synchronization

Slide 5-30

EN

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D 1

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LZU 103 506

Group Switching Subsystem

Slide 5-31

EN

/FA

D 1

09 0

015

LZU 103 506

GSS andSubsystems

Slide 5-32

EN

/FA

D 1

09 0

015

LZU 103 506

SoundTransferEquipmentto GSS

Slide 5-33

EN

/FA

D 1

09 0

015

LZU 103 506

Digital Equipment

Slide 5-34

EN

/FA

D 1

09 0

015

LZU 103 506

GroupSwitchingSubsystemGSS

Slide 5-35

EN

/FA

D 1

09 0

015

LZU 103 506

Call Flow

Slide 5-36

EN

/FA

D 1

09 0

015

LZU 103 506

Call Flow

Slide 5-37

EN

/FA

D 1

09 0

015

LZU 103 506

Three-PartyCall

A

C

Group switch

B

CCD

A

C

Group switch

B

CCD

A

C

Group switch

B

CCD

Phase 1

The original call betweenthe calling (A) and called(B) subscriber. The CCDis passive.

Phase 2

The paths A-CCD, B-CCDand C-CCD are selected.The original path A-Bis still connected.

Phase 3

The paths A-CCD, B-CCD andC-CCD are established. Thepath A-B is disconnected and the original call nowhas a new member.

0614C

Slide 5-38

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LZU 103 506

Duplication of GSD

0 12 31

ETC Digital Path B

0014A

Channel 12

0 3 31

ETC Digital Path E

Channel 3

TSM-A-0 SPM-A-0-0SSA

SSB12

TSM-A-1SSA

SSB

355

TSM-B-0 SPM-B-0-0SSA

SSB12

TSM-B-1SSA

SSB

355

Slide 5-39

EN

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D 1

09 0

015

LZU 103 506

Clocking Introduction

Slide 5-40

EN

/FA

D 1

09 0

015

LZU 103 506

Network Synchronization Function Block

Slide 5-41

EN

/FA

D 1

09 0

015

LZU 103 506

Clock Module Function Block

Slide 5-42

EN

/FA

D 1

09 0

015

LZU 103 506

ClockingSynchronizesGS and SSS

Slide 5-43

EN

/FA

D 1

09 0

015

LZU 103 506

Supervision of the Group Switch

• Continuous Supervision of Disturbances in the Hardware

• Supervision by Traffic

• Routine Tests

Slide 5-44

EN

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D 1

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LZU 103 506

64K Group Switch

TSM Group0

TSM Group3

DigitalPath

TSM0

TSM31

0

15

495

511

SPM0/0

0

31

16.384mult. pos.

0 31

SPM1/0

32

63

0 31

SPM0/1

0

31

32.768mult. pos.

32 63

SPM0/2

0

31

49.152mult. pos.

64 95

SPM0/3

0

31

65.536mult. pos.

96 127

Extension steps for SPM

SPM1/1

32

63

32 63

SPM1/2

32

63

64 95

SPM2/2

64

95

64 95

SPM2/1

64

95

32 63

SPM2/0

64

95

0 31

SPM1/3

32

63

96 127

SPM2/3

64

95

96 127

SPM3/264 95

SPM3/132 63

SPM3/0 0 31

SPM3/3

96127

96 127

96127127

9612796

TSM96

TSM127

1536

1551

2032

2047

0618B

Slide 5-45

EN

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LZU 103 506

Section 2 Objectives Review

Upon completion of this lesson, the student will be able to:

• Describe the main functions of the Group Switching Subsystem (GSS)• List the main components of the Group Switching Subsystem (GSS).• Explain the operating principle of the switching network when connecting

and disconnecting a speech path between two subscribers.

• Describe digital paths and how they are connected to the Time SwitchModule (TSM).

• Explain why the switching network is duplicated as plane A and plane B.• Explain the reason for having three clock modules and the importance of

network synchronization.

Slide 5-46

EN

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D 1

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LZU 103 506

Section 3 Objectives

Upon completion of this section, the student will be able to:

• State the main functions of the Trunk and SignalingSubsystem (TSS).

• Identify the main function blocks of the TSS.

• State the purpose of the main function blocks of the TSS.

Slide 5-47

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LZU 103 506

Main Functions of TSS

• Transmission and reception of voice and signaling to andfrom other exchanges

• Provision for all conversions required between external andinternal signals

Slide 5-48

EN

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D 1

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LZU 103 506

Trunk andSignalingSubsystem

TSS

CR/CS

CSR

ASAM

ACSM

ET

BT

ETC

EM-CS/CR

CSR-D

AST--D8

AST--DP

PCDGSS

RP RP

RPB-A RPB-B

CPB-ACPB-B

24 CHANNELPCM TRUNK

Slide 5-49

EN

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D 1

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015

LZU 103 506

Four 24-Channels to Three 32-Channels

GSSET24U board

TRUNK 24 CH

TRUNK 24 CH

TRUNK 24 CH

TRUNK 24 CH

ET24U board

ET24U board

ETBUFFU board

32 CH

8 CH

8 CH

32 CH

32 CH

8 CH

0490B

Slide 5-50

EN

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D 1

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LZU 103 506

AnnouncementServiceTerminalComparison

Magazine Type AST-D4 AST-D8AST-DP

Function Block ASAM ASAM ASCM

Digital Trunks to GroupSwitch Network

4 2 1

Number of Circuit Boards 4 8 6

Maximum Number ofAnnouncements

4 8 Note 1

Maximum Length ofAnnouncements

32 sec. 32 sec. 360 sec.

Maximum Number ofSimultaneous Listeners

128 64 32

Maximum Length of aSpeech Phrase

32 sec. 32 sec. 60 sec.

Capability of Interface toExternal Announcement

Yes No No

Immediate Connection toBeginning of Announcement

No No Yes

Connection to Announcementin Progress

Yes Yes No

Delayed Connection toStart of Announcement

Yes Yes No

Capable of GeneratingTones Automatically

Yes Yes No

Slide 5-51

EN

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D 1

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015

LZU 103 506

Auxiliary Services

• PCD• EM-CS/CR

Slide 5-52

EN

/FA

D 1

09 0

015

LZU 103 506

Section 3 Objectives Review

Upon completion of this section, the student will be able to:

• State the main functions of the Trunk and SignalingSubsystem (TSS).

• Identify the main function blocks of the TSS.

• State the purpose of the main function blocks of the TSS.