H.4 State transition diagrams and SDL diagrams

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Санкт-Петербургский государственный университет телекоммуникаций им. проф. М.А. Бонч-Бруевича

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SSCI→ CPCI

SSCI→ CPCI

Each ISDN-UP main functional block is further sub-divided into the functional blocks. Functional diagrams and simple state transition diagrams for each main functional block are shown below:

1)Signalling Procedure Control (SPRC)

–Figure H.4: Functional diagrams.

–Figure H.5:

State transition diagrams.

2)Call Processing Control (CPC)

–Figure H.6: Functional diagrams.

–Figures H.7 to H.10: State transition diagrams.

3)Circuit Supervision Control (CSC)

–Figure H.11: Functional diagrams.

–Figures H.12 to H.18: State transition diagrams.

ISDN-UP

CPC

CSC

SPRC

Message

Sending

Distribution

Control

(MSDC)

(MDSC)

MTP

T1154060-93/d004

FIGURE H.4/Q.764

Functional block diagram for SPRC

10	Recommendation Q.764 – Annex H (02/95)

0	0
Idle	Idle
Receive message from	Receive message from	Receive circuit
functional block.	MTP. Send message	status.
Send message to MTP	to functional block	Update circuit
		status
	T1154070-93/d005
a) Sending	b) Reception

FIGURE H.5/Q.764

State transition diagrams for SPRC

Call Control (CC)

ind.

req.

ind.

conf.

resp.

conf.

CPC

Simple Segmentation

Control Incoming (SSCI)

Control Outgoing (SSCO)

ISDN-UP

message

Call Processing

Control Incoming

Control Outgoing

SPRC

(CPCI)

(CPCO)

SPRC

Continuity

Check

Incoming

Outgoing

(CCI)

(CCO)

Start, Report

T1154080-93/d006

CSC

FIGURE H.6/Q.764

Functional block diagram for CPC

Recommendation Q.764 – Annex H (02/95)

0
	Idle
	Receive IAM Send Set-up Ind.
		1
			Wait for
			continuity
	Receive COT Send Continuity Report Ind.
2						States:
						States:
	Wait for ACM					1, 2, 3, 4
	Wait for ACM					or 5
						or 5
	Receive Proc Req. Send ACM
3
	Wait for ANM	Receive Alert Req. Send CPG
Receive	Receive Set-up Resp. Send ANM			Send or receive RES
Set-up Resp.
Send CON.
4	ICC
	ICC
	answered
					Send or
					receive SUS
			5
				ICC
				suspended
	Receive Release		Receive REL			Receive RSC		Receive GRS
	Req. Send REL		Send Release Ind.			Send Reset Ind.		Send Reset Ind.
6	Wait for RLC	7	Wait for ICC		8	Wait for ICC	9	Wait for ICC
	Wait for RLC		release			reset		group reset
			complete			complete		complete
	Receive RLC		Receive Release			Receive Reset		Receive Reset
	Send Release Conf.		Resp. Send RLC			Resp. Send RLC		Resp. Send
								GRA
						T1154090-93/d007
NOTES

1	An SGM or UMT, received in any state from SPRC, is sent in an SGP or UMT Indication to SSCI.
2	An SGP or UMT Request, received in any state from SSCI, is sent in an SGM or UMT to SPRC.

FIGURE H.7/Q.764

State transition diagram for CPC Incoming (CPCI)

12	Recommendation Q.764 – Annex H (02/95)

Idle

Receive Set-up Req. Send IAM

Wait for continuity report

Receive Continuity

Report Req. Send COT

States: Wait for ACM 1, 2, 3, 4

or 5

Receive ACM or CON Send Proc Ind.

Wait for ANM

Receive CPG Send Alert Ind.

Receive ANM Send Set-up Conf.

Send or receive RES

OGC

answered

Send or

receive SUS

OGC

suspended

Receive Release

Receive REL

Receive RSC

Receive GRS

Req. Send REL

Send Release Ind.

Send Reset Ind.

Wait for OGC

Wait for RLC

release

reset

group reset

complete

Receive RLC

Receive Release

Receive Reset

Send Release Conf.

Resp. Send RLC

Resp. Send

GRA

T1154100-93/d008

NOTES

1An SGM or UMT, received in any state from SPRC, is sent in an SGP or UMT Indication to SSCO.

2An SGP or a UMT Request, received in any state from SSCO, is sent in an SGM or UMT to SPRC.

FIGURE H.8/Q.764

State transition diagram for CPC Outgoing (CPCO)

Recommendation Q.764 – Annex H (02/95)

Idle

Start

send CHECK TONE

Wait for

Wait

backward

check tone

Stop

Receive BACKWARD

CHECK TONE

a) Incoming (CCI)

Wait for tone

disappearance

Tone disappearance

T1154110-93/d009

b) Outgoing (CCO)

FIGURE H.9/Q.764

State transition diagrams for CPC Continuity Check

Idle

Receive Segmented Message

Save the Segmented Message

Wait for SS

Receive SGM. Assemble and

Send the Assembled primitive

a) Incoming (SSCI)

b) Outgoing (SSCO)

T1154120-93/d010

FIGURE H.10/Q.764

State transition diagrams for CPC Simple Segmentation

14	Recommendation Q.764 – Annex H (02/95)

req., ind., resp.

req., conf., ind.

CSC

ISDN-UP

message

BLR

BLS

message

ISDN-UP

message

MGBR

MGBS

message

HRB

HLB

ISDN-UP

SPRC

message

HGBR

HGBS

message

SPRC

ISDN-UP

message

CRR

CRS

message

ISDN-UP

message

CGRR

CGRS

ISDN-UP

message

CRCR

CRCS

message

T1154130-93/d011

FIGURE H.11/Q.764

Functional block diagram for CSC

Recommendation Q.764 – Annex H (02/95)

Idle

Receive

Receive BLO

BLOCKING REQ.

Send

Send BLO

BLOCKING IND.

Wait for

BLOCKING

BLA

RESP.

Receive BLA

Receive

Send

BLOCKING RESP.

BLOCKING CONF.

Send BLA

Locally

Remotely

blocked

Receive

Receive UBL

UNBLOCKING REQ.

Send

Send UBL

UNBLOCKING IND.

Wait for

Wait

for

UBA

UNBLOCKING

RESP.

Receive UBA

Receive

Send

UNBLOCKING RESP.

UNBLOCKING CONF.

Send UBA

a) Sending (BLS)

b) Reception (BLR) T1154140-93/d012

FIGURE H.12/Q.764

State transition diagrams for Blocking/Unblocking

16	Recommendation Q.764 – Annex H (02/95)

0
	Idle
	Receive	Receive
	BLOCKING REQ.	UNBLOCKING REQ.
	Send CGB	Send CGU
1	2
	Wait for	Wait for
	CGBA	CGUA
	Receive CGBA	Receive CGBA
	Send	Send
	BLOCKING CONF	UNBLOCKING CONF.

0
Idle
Receive CGB		Receive CGU
Send		Send
BLOCKING IND.		UNBLOCKING IND.
1	2
Wait for	Wait for
BLOCKING	UNBLOCKING
RESP.	RESP.
Receive		Receive
Receive		UNBLOCKING RESP.
BLOCKING RESP.		UNBLOCKING RESP.
BLOCKING RESP.		Send CGUA
Send CGBA		Send CGUA
Send CGBA
		T1154150-93/d013

a) Sending (MGBS)

b) Reception (MGBR)

FIGURE H.13/Q.764

State transition diagrams for Maintenance Group Blocking/Unblocking

Idle

Receive Internal Blocking

Send Internal Blocking

Locally

Remotely

blocked

Receive Internal Unblocking

Send Internal Unblocking

T1154160-93/d014

a) Locally blocking state (HLB)

b) Remotely blocking state (HRB)

FIGURE H.14/Q.764

State transition diagrams for Hardware Failure Oriented Blocking state

Recommendation Q.764 – Annex H (02/95)

0
Idle
Receive BLOCKING REQ.		Receive
Receive BLOCKING REQ.		UNBLOCKING
Send CGB		UNBLOCKING
Send CGB		REQ. Send CGU
		REQ. Send CGU
1	2
Wait for	Wait for
CGBA	CGUA
Receive CGBA		Receive CGUA
Receive CGBA		Send UNBLOCKING
Send BLOCKING CONF.		Send UNBLOCKING
Send BLOCKING CONF.		CONF.
		CONF.

0
	Idle
	Receive CGB		Receive CGU
	Send BLOCKING IND.		Send
			UNBLOCKING IND.
1	Wait for	2 Wait for
	BLOCKING	UNBLOCKING
	RESP.	RESP.
	Receive BLOCKING		Receive
	Receive BLOCKING		UNBLOCKING
	RESP. Send CGBA		UNBLOCKING
	RESP. Send CGBA		RESP. Send CGUA
			RESP. Send CGUA
			T1154170-93/d015

a) Sending (HGBS)

b) Reception (HGBR)

FIGURE H.15/Q.764

State transition diagrams for Group Blocking/Unblocking

Idle

Receive RESET REQ.

Receive RSC

Send RSC

Send Reset

Wait

for

Wait

for

release

response

Receive RLC

Receive Reset complete

Send RESET CONF.

Send RLC

T1154180-93/d016

a) Sending (CRS)

b) Reception (CRR)

FIGURE H.16/Q.764

State transition diagrams for circuit reset

18	Recommendation Q.764 – Annex H (02/95)

0		0
Idle		Idle
	Receive RESET REQ.		Receive GRS
	Send GRS		Send RESET
1		1
Wait for		Wait for
GRA		GROUP RESET
		complete
	Receive GRA		Receive GROUP RESET
	Send RESET CONF.		COMPLETE Send GRA
			T1154190-93/d017
			T1154190-93/d017
a) Sending (CGRS)		b) Reception (CGRR)

FIGURE H.17/Q.764

State transition diagrams for group reset


0				0
		Idle				Idle
		Receive CONTINUITY					Receive CONTINUITY
		RECHECK REQ.					RECHECK REQ.

	1			1
		Wait for				Wait for
		time-out				CCR
		SEND CCR					Receive CCR

2		Wait for back-			2	Wait for
		Wait for back-				Wait for
		ward check tone				REL
		Receive backward					Receive REL
		check-tone					Send RLC
		Send REL
		Send REL	b) Reception (CRCR)

3
3
		Wait for
		RLC					T1154200-93/d018
							T1154200-93/d018

Receive RLC

Send CONTINUITY

RECHECK CONF.

a) Sending (CRCS)

FIGURE H.18/Q.764

State transition diagrams for Continuity Recheck

Recommendation Q.764 – Annex H (02/95)

The ISDN-UP SDL diagrams are described based on the three-block approach. In this approach, call control, which provides signalling-independent functions such as connect-through, circuit selection and digits analysis, is outside the ISDN-UP. The SDL diagrams provide functional modelling at message level for the basic call procedures as in this Recommendation. The SDL diagrams do not include models for the procedures for supplementary services, end-to-end signalling, and for national use. The states defined in the SDL diagrams are merely for illustration. The ISDN-UP diagrams are provided for the above main functional blocks, as shown below:

1)Signalling Procedures Control (SPRC)

–Figure H.19:

Message Sending Control (MSDC).

–Figure H.20:

Message Distribution Control (MDSC).

2)Call Processing Control (CPC)

–Figure H.21:

Call Processing Control Incoming (CPCI).

–Figure H.22:

Call Processing Control Outgoing (CPCO).

–Figure H.23:

Simple Segmentation Control Incoming (SSCI).

–Figure H.24:

Simple Segmentation Control Outgoing (SSCO).

–Figure H.25:

Continuity Check Incoming (CCI).

–Figure H.26:

Continuity Check Outgoing (CCO).

3)Circuit Supervision Control (CSC)

–Figure H.27:

Blocking/Unblocking Message Sending (BLS).

–Figure H.28:

Blocking/Unblocking Message Reception (BLR).

–Figure H.29:

Maintenance Oriented Circuit Group Blocking/Unblocking Sending (MGBS).

–Figure H.30:

Maintenance Oriented Circuit Group Blocking/Unblocking Reception (MGBR).

–Figure H.31:

Hardware Failure Oriented Locally Blocking (HLB).

–Figure H.32

Hardware Failure Oriented Remotely Blocking (HRB).

–Figure H.33:

Hardware Failure Oriented Circuit Group Blocking/Unblocking Sending (HGBS).

–Figure H.34:

Hardware Failure Oriented Circuit Group Blocking/Unblocking Reception (HGBR).

20	Recommendation Q.764 – Annex H (02/95)

–Figure H.35:

Circuit Reset Sending (CRS).

–Figure H.36:

Circuit Reset Reception (CRR).

–Figure H.37:

Circuit Group Reset Sending (CGRS).

–Figure H.38:

Circuit Group Reset Reception (CGRR).

–Figure H.39:

Continuity Recheck Sending (CRCS).

–Figure H.40:

Continuity Recheck Reception (CRCR).

The procedures referred to in the functional blocks are described in the last section of the SDL diagrams. The diagrams describing the procedures are listed as shown below:

1)Call Processing Control (CPC)

–Figure H.41: Segment the message.

–Figure H.42:

CPCI local exchange echo control device.

–Figure H.43:

CPCI transit exchange echo control device.

–Figure H.44:

CPCO local exchange echo control device.

–Figure H.45:

CPCO transit exchange echo control device.

–Figure H.46:

CPCO local exchange echo control device.

Recommendation Q.764 – Annex H (02/95)

Idle

Maintenance	Call control	CFN
message	message	CFN
message	message	MDSC→ MSDC
CSC→ MSDC	CPC→ MSDC	MDSC→ MSDC

		T1154210-93/d019
Message to
be sent
MSDC→ MTP

Idle

FIGURE H.19/Q.764

Message Sending Control (MSDC)

22	Recommendation Q.764 – Annex H (02/95)

				0
				Idle
		1
	1			Received
				Received
				message
				(Note 1)		See 2, 9, 5, 4, 1
	See 2, 9, 5			→ MDSC		See 2, 9, 5, 4, 1
	Yes	Message	No	Unrecognized	Yes
		format error?		Unrecognized
		format error?		message?
		No
			Yes	CFN?		u-msg
				CFN?		u-msg
		Maintenance		No
		System Ind.		No
		System Ind.
		(Note 2)
		MDSC→ CC
		Discard
		0
		Idle
	Group maintenance messages			Message	Maintenance messages
				Message
		(GRS, GRA,		type?	(BLO, UBL, BLA, UBA, CCR, RSC)
		CGB, CGBA,			(BLO, UBL, BLA, UBA, CCR, RSC)
		CGB, CGBA,
		CGU, CGUA)		(COT, REL)
		Maintenance		(COT, REL)
		Maintenance
		message
		MDSC→ CSC			No	Circuit	Maintenance
CGRS, CGRR,					No	Circuit	Maintenance
CGRS, CGRR,						con. recheck	message
MGRS, MGBR,						con. recheck	message
MGRS, MGBR,						active	MDSC→ CSC
HGBS, HGBR				Other call control
		0		messages		Yes	CRR
		Idle		Call control		Maintenance	CRR
				Call control		Maintenance	BLS
				message		message	BLR
				MDSC→ CPC		MDSC→ CSC	CRCS
				MDSC→ CPC		MDSC→ CSC	CRCR
							CRCR
		CPC					CRCS
		CPC					CRCR
							CRCR
				0		0	0
				Idle		Idle	Idle
							T1154220-93/d020
NOTES
1	MTP.
2	Procedure dependent action.

FIGURE H.20/Q.764 (sheet 1 of 2)

Message Distribution Control (MDSC)

Recommendation Q.764 – Annex H (02/95)

u-msg

Message

Comp. Param.

received?

Yes No

A	exchange	B					CFN
	type?						MDSC→	MSDC
			A = 1	Check	In the msg,
				bit A	comp. param.
							Discard
In the msg,	Check			A = 0
comp. param.	bit B C D?
							0
							Idle
1XX	001	011
Maintenance		CFN			Yes
System Ind.		CFN			Yes	Pass on
(Release call)		MDSC	MSDC			possible?
(Release call)		→				possible?
MDSC→ CC
						No
				Received Message
				MDSC→ CPC
				0	1	Check	0
		Discard		Idle	1	Check	0
		Discard		Idle		bit E
						bit E
		0
		Idle			Discard		Release
		Idle			Discard		call
							call
					0
						Idle
							T1154230-93/d021

FIGURE H.20/Q.764 (sheet 2 of 2)

Message Distribution Control (MDSC)

24	Recommendation Q.764 – Annex H (02/95)

		0
			Idle
								1
		IAM		Address				2
		IAM		received
		SPRC→ CPCI		(Note 2)
				→	CPCI
							If multirate call
		Test call?		No			check all circuits
				No

			Yes			H-blocked
						H-blocked
		Seized by			Yes		and
				Remotely	Yes	M-blocked		H-blocked	M-blocked
				Remotely		M-blocked		H-blocked	M-blocked
		CPC		blocked?
		CPCI→	SPRC	blocked?
		CPCI→	SPRC
				No
		CCH?				Unblocking		Unblocking
		(Note 1)				CPCI→	BLR	CPCI→ BLR
		0	1	2
2, 3, 4 or 5	Determine	Start				Unblocking
	exchange type	CPCI→	CCI			CPCI→	HRB
	6
						H-blocked
IHECD avail		Start T8			Yes		and
IHECD avail					Yes	M-blocked H-blocked M-blocked
= False				Locally blocked?		M-blocked H-blocked M-blocked
= False				Locally blocked?
				No
	Dest. CPCI	Determine		2, 3, 4 or 5		Blocking			Blocking
	F/W ECD	Determine		2, 3, 4 or 5		Blocking			Blocking
	F/W ECD	exchange type				CPCI→ BLS			CPCI→ BLS
	control (Note 3)	exchange type				CPCI→ BLS			CPCI→ BLS
	control (Note 3)
		6

Setup Ind.	Dest. CPCI	IHECD avail	Blocking
	F/W ECD
CPCI→ SSCI		= False	CPCI→ HGBS
	control

Setup Ind.

Wait for ACM → Discard See 2, 8, 2, 1 CPCI SSCI

1	0
Wait for continuity	Idle

T1154240-93/d022

NOTES

1CCH (Continuity Check Indicator): 0 – Not required.

1 – Required on incoming circuit.

2 – Performed on previous circuit.

2CPCO, CRCS.

3F/W Forward.

FIGURE H.21/Q.764 (sheet 1 of 20)

Call Processing Control Incoming (CPCI)

Recommendation Q.764 – Annex H (02/95)

Idle

1
1
	Unexpected	REL			Reset	Reset		RLC
	message	REL			Reset	Reset		RLC
	message	SPRC		CPCI	CRR→ CPCI	CGRR	→ CPCI	SPRC→ CPCI
	SPRC→ CPCI		→		CRR→ CPCI	CGRR	→ CPCI	SPRC→ CPCI
	SPRC→ CPCI
Reset		RLC			Reset complete	Reset complete
Reset		RLC			Reset complete	Reset complete		Discard
CPCI→ CRS		CPCI→		SPRC	CPCI→ CRR	CPCI→ CGRR		Discard
CPCI→ CRS		CPCI→		SPRC	CPCI→ CRR	CPCI→ CGRR

0		0			0	0		0
	Idle	Idle			Idle	Idle		Idle
								T1154250-93/d023

FIGURE H.21/Q.764 (sheet 2 of 20)

Call Processing Control Incoming (CPCI)

26	Recommendation Q.764 – Annex H (02/95)

1
Wait for
continuity
								2
								4
COT				T8			SAM
SPRC→	CPCI			T8			SPRC→	CPCI
SPRC→	CPCI						SPRC→	CPCI
CCH?		2		CCH?		2	Info Ind.
							Info Ind.
							CPCI→ SSCI
							CPCI→ SSCI
1				1
							1
Stop CCI				Stop CCI			Wait for continuity
CPCI→ CCI				CPCI→ CCI			Wait for continuity
CPCI→ CCI				CPCI→ CCI
Stop T8				Call failure Ind.
Stop T8				CPCI→ SSCI
				CPCI→ SSCI
COT		No		REL
success?				CPCI→	SPRC
Yes
Continuity		Call failure Ind.
Report Ind.		(Continuity failure)		Start T5
CPCI→ SSCI		CPCI→	SSCI
2
Wait for ACM		Idle CPC		Start T1
Wait for ACM		CPCI→	SPRC	Start T1
		CPCI→	SPRC
		0		6
			Idle	Wait for RLC
						T1154260-93/d024

FIGURE H.21/Q.764 (sheet 3 of 20)

Call Processing Control Incoming (CPCI)

Recommendation Q.764 – Annex H (02/95)

Wait for continuity

2								3
3								5
RLC			REL		Reset	Unexpected
RLC			REL		Reset	message
SPRC→		CPCI	SPRC→	CPCI	CRR→ CPCI	message
SPRC→		CPCI	SPRC→	CPCI	CRR→ CPCI	SPRC→		CPCI
						SPRC→		CPCI
Call failure Ind.				2	2			2
Call failure Ind.			CCH?		CCH?	CCH?
CPCI→	SSCI		CCH?		CCH?	CCH?
CPCI→	SSCI
			1		1		1
Release Req.			Stop CCI		Stop CCI	Stop CCI
SSCI→ CPCI			CPCI→ CCI		CPCI→ CCI	CPCI→	CCI
CCH?	2		Stop T8		Stop T8	Stop T8
CCH?			Stop T8		Stop T8	Stop T8
1
Stop CCI			Release Ind.		Reset Ind.	Start reset Ind.
CPCI→ CCI			CPCI→ SSCI		CPCI→ SSCI	CPCI→	SSCI
			7		8
Stop T8			Wait for ICC		Wait for ICC reset	Reset
Stop T8			release complete		Wait for ICC reset	CPCI→	CRS
			release complete			CPCI→	CRS
REL						Idle CPC
CPCI→ SPRC						CPCI→	SPRC
Start T5								Get next CIC
					For multirate	More		Yes
					For multirate	More
Start T1					connection	circuit(s) to
					type	reset?
							No
6						0
Wait for RLC							Idle
								T1154270-93/d025

FIGURE H.21/Q.764 (sheet 4 of 20)

Call Processing Control Incoming (CPCI)

28	Recommendation Q.764 – Annex H (02/95)

	1
	Wait for continuity
	3
4
	Reset	Blocking		Release		Reset
	CGRR→ CPCI	MGBS→	CPCI	(Note 1) →	CPCI	(Note 2) →	CPCI
	CCH?	2		Call failure Ind.
				Call failure Ind.
				CPCI→	SSCI
				CPCI→	SSCI
	1
	Stop CCI			CCH?		2
	Stop CCI
	CPCI→ CCI
	CPCI→ CCI
					1
	Stop T8			Stop CCI
	Stop T8			CPCI→	CCI
				CPCI→	CCI
	Reset Ind.			Stop T8
	CPCI→ SSCI			Stop T8
	CPCI→ SSCI
	9
	Wait for ICC			Idle CPC
	group reset			CPCI→	SPRC
				0
				Idle
						T1154280-93/d026
NOTES
1	HGBS, HGBR.
2	CRS, CGRS.

FIGURE H.21/Q.764 (sheet 5 of 20)

Call Processing Control Incoming (CPCI)

Recommendation Q.764 – Annex H (02/95)

(02/95) H Annex – 764.Q Recommendation 30

Wait for ACM

			4
			7
Proc Req.	Alert Req.		Prog (network)
Proc Req.	Alert Req.		Req.
SSCI→ CPCI	SSCI→	CPCI	Req.
SSCI→ CPCI	SSCI→	CPCI	SSCI→ CPCI
			SSCI→ CPCI

Determine

2, 3, 4 or 5

Determine

2, 3, 4 or 5

Determine

2, 3, 4 or 5

exchange type?

Local CPCI

Transit CPCI

Local CPCI

Transit CPCI

Local CPCI

Transit CPCI

B/W ECD control

(Note)

ACM

CPCI→

SPRC

CPCI

→ SPRC

CPCI→ SPRC

Wait for ANM

T1154290-93/d027

NOTE – B/W Backward.

FIGURE H.21/Q.764 (sheet 6 of 20)

	2
	Wait for ACM
	4							5
	6							8
	Setup Resp.		Prog (Access)		Unexpected
	Setup Resp.		Req.		message
	SSCI→ CPCI		Req.		message
	SSCI→ CPCI		SSCI→ CPCI		SPRC→		SSCI
			SSCI→ CPCI		SPRC→		SSCI
	Determine	2, 3, 4 or 5	Determine	2, 3, 4 or 5	Start Reset
	Determine	2, 3, 4 or 5	Determine	2, 3, 4 or 5	Ind.
	exchange type?		exchange type?		Ind.
	exchange type?		exchange type?		CPCI→	SSCI
					CPCI→	SSCI
	6		6
	Local CPCI	Transit CPCI	Local CPCI	Transit CPCI	Reset
.QRecommendation	B/W ECD control	B/W ECD control	B/W ECD control	B/W ECD control	CPCI→	CRS
.QRecommendation	CON		ACM		Idle CPC			Get next CIC
	CPCI→ SPRC		CPCI→ SPRC		CPCI→	SPRC		Get next CIC
	CPCI→ SPRC		CPCI→ SPRC		CPCI→	SPRC
764	4		3			More
				For multirate		More		Yes
	ICC answered		Wait for ANM	For multirate	circuit(s) to			Yes
–	ICC answered		Wait for ANM	connection type	circuit(s) to
–				connection type	reset?
Annex					reset?
Annex						No
						No
H					0
H
(02/95)						Idle
(02/95)								T1154300-93/d028
								T1154300-93/d028

FIGURE H.21/Q.764 (sheet 7 of 20)

(02/95) H Annex – 764.Q Recommendation 32

Wait for ACM

Reset

IBI Req.

SAM

Reset

(Note 2)

Release

CGRR→ CPCI

CRR

→ CPCI

SSCI→

CPCI

SPRC→ CPCI

→

CPCI

(Note 3)→ CPCI

Call failure

Reset Ind.

ACM

Info Ind.

Idle CPC

Ind.

CPCI→ SSCI

CPCI→ SPRC

CPCI→ SSCI

CPCI

SPRC

→

CPCI→ SSCI

Wait for ICC

Wait for ICC reset

Wait for ANM

Wait for ACM

Idle

group reset

(Note 1)

T1154310-93/d029

Blocking

MGBS→ CPCI

Call failure

Ind.

CPCI→ CC

Idle CPC

CPCI→ SPRC

Idle

NOTES

1Only REL/RLC message is expected. Other messages are discarded.

2CRS, CGRS.

3 HGBS, HGBR.	FIGURE H.21/Q.764 (sheet 8 of 20)

33 (02/95) H Annex – 764.Q Recommendation

Wait for ACM

REL

RLC

Blocking

Release

T37

(Access)

Req.

SPRC→ CPCI

SPRC→

CPCI

MGBS→

CPCI

SSCI→ CPCI

2, 3, 4 or 5

Release Ind.

Call failure

REL

Determine

Ind.

exchange type?

CPCI→ SSCI

CPCI→ SPRC

CPCI→ SSCI

CPCI→ CC

Include

Wait for ICC

REL

Idle CPC

Start T5

OHECD

IHECD

release complete

CPCI→

SPRC

CPCI→ SPRC

Start T5

Idle

Start T1

Wait for ACM

Start T1

Wait for RLC

T1154320-93/d030

Wait for RLC

FIGURE H.21/Q.764 (sheet 9 of 20)

(02/95) H Annex – 764.Q Recommendation 34

Wait for ANM

Setup Resp.

Alert Req.

Prog Req.

IBI Req.

Release Req.

RLC

(Access)

SSCI→ CPCI

SPRC→

CPCI

SSCI→ CPCI

T37

CPG

REL

Call failure

Ind.

running?

CPCI→

SPRC

CPCI→

SPRC

CPCI→

SPRC

CPCI→

SPRC

CPCI→ SSCI

Yes

Stop T37

Wait for ANM

Wait for ANM (Note)

Start T5

Enable ECD

Start T1

ANM

Wait for RLC

CPCI→

SPRC

T1154330-93/d031

ICC answered

NOTE – Only REL/RLC message is expected. Other messages are discarded.

FIGURE H.21/Q.764 (sheet 10 of 20)

35 (02/95) H Annex – 764.Q Recommendation

Wait for ANM

REL

FOT

Reset

Release

Reset

SPRC→ CPCI

CRR→ CPCI

CGRR→ CPCI

(Note 1) → CPCI

(Note 2) → CPCI

Release Ind.

Forward

Reset Ind.

Call failure

Transfer Ind.

Ind.

CPCI→ SSCI

Wait for ICC

Wait for ANM

Wait for ICC reset

Wait for ICC group

Idle CPC

release complete

reset

CPCI→ SPRC

Idle

T1154340-93/d032

NOTES

1HGBS, HGBR.

2CRS, CGRS.

FIGURE H.21/Q.764 (sheet 11 of 20)

(02/95) H Annex – 764.Q Recommendation 36

Wait for ANM

Determine

2, 3, 4 or 5

Determine

2, 3, 4 or 5

IHECD

– avail

exchange type?

= True

Yes

Local CPCI

Transit CPCI

Local CPCI

Transit CPCI

Include IHECD

Include OHECD

B/W NRM

F/W NRM

3	3


Wait for ANM	Wait for ANM	IHECD – avail	OHECK – avail
Wait for ANM	Wait for ANM	= False	= False
		= False	= False

ICC answered

T1154350-93/d033

FIGURE H.21/Q.764 (sheet 12 of 20)

37 (02/95) H Annex – 764.Q Recommendation

ICC answered

SUS (Note 1)

Suspended

REL

Reset (Note)

RLC

Req.

SPRC→

CPCI

SPRC→

CPCI

→

CPCI

SPRC→

CPCI

SSCI→ CPCI

Suspend Ind.

SUS

Release Ind.

Idle CPC

Call failure

Ind.

CPCI→ CC

CPCI→ SPRC

CPCI→ SSCI

CPCI→

SPRC

CPCI → SSCI

ICC suspended

Wait for ICC

Idle

REL

release complete

CPCI→

SPRC

NRM req.

Start T5

SSCI→ CPCI

SSCI→

CPCI

2, 3, 4, 5

Determine

2, 3, 4, 5

Determine

Start T1

exchange type

Local CPCI

Transit CPCI

Local CPCI

Transit CPCI

Wait for RLC

B/W NRM

F/W NRM

T1154360-93/d034

ICC answered

NOTE – CRS, CGRS.

FIGURE H.21/Q.764 (sheet 13 of 20)

ICC answered

9
13
	Reset	Reset		Release	Release		FOT
	Reset	Reset		Req.	(Note)		FOT
	CRR→ CPCI	CGRR→	CPCI	Req.	(Note)		SPRC→ CPCI
	CRR→ CPCI	CGRR→	CPCI	SSCI→ CPCI	→	CPCI	SPRC→ CPCI
				SSCI→ CPCI	→	CPCI
Reset Ind.		Reset Ind.		REL	Release Ind.		Forward
Reset Ind.		Reset Ind.		REL	Release Ind.		Transfer Ind.
CPCI→ SSCI		CPCI→ SSCI		CPCI→ SPRC	CPCI→	SSCI	Transfer Ind.
CPCI→ SSCI		CPCI→ SSCI		CPCI→ SPRC	CPCI→	SSCI	CPCI→ SSCI
							CPCI→ SSCI
2		9					4
Wait for ICC reset		Wait for ICC		Start T5	Idle CPC		ICC answered
Wait for ICC reset		group reset		Start T5	CPCI→	SPRC	ICC answered
		group reset			CPCI→	SPRC
							T1154370-93/d035
					0
				Start T1		Idle

Wait for RLC

NOTE – HGBS, HGBR.

FIGURE H.21/Q.764 (sheet 14 of 20)

Call Processing Control Incoming (CPCI)

38	Recommendation Q.764 – Annex H (02/95)

5
ICC suspended
									10
									16
Resumed		Suspended		REL			Release Req.	RLC
Req.		Req.		REL			Release Req.	RLC
Req.		Req.		SPRC→		CPCI	SSCI→ CPCI	SPRC→	CPCI
SSCI→ CPCI		SSCI→ CPCI		SPRC→		CPCI	SSCI→ CPCI	SPRC→	CPCI
SSCI→ CPCI		SSCI→ CPCI
RES		SUS		Release Ind.			REL	Call failure
RES		SUS		Release Ind.			REL	Ind.
CPCI→ SPRC		CPCI→	SPRC	CPCI→	SSCI		CPCI→ SPRC	Ind.
CPCI→ SPRC		CPCI→	SPRC	CPCI→	SSCI		CPCI→ SPRC	CPCI→ SSCI
								CPCI→ SSCI
Suspended	No	5		7
Suspended	No	ICC suspended		Wait for ICC			Start T5
from originating		ICC suspended		release complete			Start T5
side?				release complete
side?
Yes
5
ICC suspended							Start T1
4							6
ICC answered							Wait for RLC
						SUS (Note)
						SPRC→	CPCI
			RES		Suspended Ind.
			(Note)		Suspended Ind.
			(Note)		CPCI→ CC
			SPRC→	CPCI	CPCI→ CC
			SPRC→	CPCI
			Resumed ind.		5
			Resumed ind.			ICC suspended
			CPCI→ CC			ICC suspended
			CPCI→ CC
			Suspended		No
			from terminating
			side?
			Yes
			4			5
			ICC answered			ICC suspended
							T1154380-93/d036

NOTE – Only user-initiated.

FIGURE H.21/Q.764 (sheet 15 of 20)

Call Processing Control Incoming (CPCI)

Recommendation Q.764 – Annex H (02/95)

5
ICC suspended
10
15
Reset	Reset		Reset (Note 1)		Release
CGRR→ CPCI	CRR→	CPCI	→	CPCI	(Note 2)→	CPCI
Reset Ind.	Reset Ind.		Idle CPC		Release Ind.
CPCI→ SSCI	CPCI→ SSCI		CPCI→	SPRC	CPCI→ SSCI
9	8		0
Wait for ICC	Wait for ICC reset			Idle
group reset	Wait for ICC reset			Idle
group reset

T1154390-93/d037

NOTES

1CRS, CGRS.

2HGBS, HGBR.

FIGURE H.21/Q.764 (sheet 16 of 20)

Call Processing Control Incoming (CPCI)

40	Recommendation Q.764 – Annex H (02/95)

Wait for RLC

							11
							18
REL		RLC		T1		T5
→	CPCI	→	CPCI
SPRC	CPCI	SPRC	CPCI
RLC		Release Conf.		REL	Stop T1
CPCI→	SPRC	CPCI→ SSCI		CPCI→ SPRC	Stop T1
CPCI→	SPRC	CPCI→ SSCI		CPCI→ SPRC
6					Reset after
Wait for RLC		Stop T5		Start T1	Reset after
Wait for RLC		Stop T5		Start T1	T5
					CPCI→	CRS
				6	Maintenance
					Maintenance
		Stop T1		Wait for RLC	System Ind.
					→	CC
					CPCI	CC
		Idle CPC			Idle CPC		Get next CIC
		CPCI–SPRC			CPCI→	SPRC	Get next CIC
		CPCI–SPRC			CPCI→	SPRC
		0
		Idle		For multirate	More circuit(s)		Yes
		Idle		connection type	to reset?
				connection type	to reset?
						No
					0
						Idle
							T1154400-93/d038

FIGURE H.21/Q.764 (sheet 17 of 20)

Call Processing Control Incoming (CPCI)

Recommendation Q.764 – Annex H (02/95)

	6
	Wait for RLC
	11
17
	Reset	Reset	Reset (Note 1)	Release
	CRR→ CPCI	CGRR→ CPCI	→ CPCI	(Note 2) →	CPCI
	Reset complete	Reset complete	Stop T5
	CPCI→ CRR	CPCI→ CGRR	Stop T5
	CPCI→ CRR	CPCI→ CGRR
	Stop T5		Stop T1
	Stop T1		Idle CPC
	Stop T1		CPCI→ SPRC
			CPCI→ SPRC
			0
	Release Conf.		Idle
	CPCI→ SSCI		Idle
	CPCI→ SSCI
			T1154410-93/d039
	Idle CPC
	CPCI→ SPRC
	0
	Idle
NOTES
1	CRS, CGRS.
2	HGBS, HGBR.

FIGURE H.21/Q.764 (sheet 18 of 20)

Call Processing Control Incoming (CPCI)

42	Recommendation Q.764 – Annex H (02/95)

Wait for ICC release complete

Release Resp.			Reset		Reset		Reset		(Note 1)	Release
Release Resp.			Reset		Reset		Reset		(Note 1)	(Note 2)
SSCI CPCI			CRR	CPCI	CGRR CPCI		→	CPCI		(Note 2)
→			→			→	→			→ CPCI
										→ CPCI
RLC		Reset complete			Reset complete
→	SPRC	→	CRR		→
CPCI	SPRC	CPCI	CRR		CPCI CGRR

T1154420-93/d040

Idle CPC

CPCI→ SPRC

Idle

NOTES

1CRS, CGRS.

2HGBS, HGBR.

FIGURE H.21/Q.764 (sheet 19 of 20)

Call Processing Control Incoming (CPCI)

Recommendation Q.764 – Annex H (02/95)

8		9
Wait for ICC reset		Wait for ICC
		group	reset

Reset Resp.		Reset Resp.
SSCI→	CPCI	SSCI→ CPCI
Reset complete		Reset complete
CPCI→	CRR	CPCI→ CGRR
Idle CPC		Idle CPC
CPCI→	SPRC	CPCI→ SPRC
0		0
	Idle	Idle
		T1154430-93/d041
	FIGURE	H.21/Q.764 (sheet 20 of 20)

Call Processing Control Incoming (CPCI)

44	Recommendation Q.764 – Annex H (02/95)

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