PHS MoU Document
C-IF3.01-02-TS
Title: PHS-FWA System : Interface Specification between Fixed
Wireless Access Controller and Service Node -Analogue
Subscriber Interface Version: 02
Date: June 7, 2000
PHS MoU Classification: Unrestricted
List of contents:
1. General
2. Interface
2.1 Function
2.2 DC characteristics
2.3 AC characteristics
2.4 Subscriber cable
2.5 Over voltage and current protection
3. Comments for Implementation
3.1 Power Feeding
4. References
5. Items for Further Study
5.1 Test functions
ANNEX A
Number of pages: 30

PHS MoU Group
c/o Association of Radio Industries and Businesses (ARIB)
14F, Nittochi Bldg., 4-1, Kasumigaseki, 1-choume, Chiyoda-ku, Tokyo 100-0013, Japan
TEL +81-3-5510-8599 FAX +81-3-3592-1103© PHS MoU Group 2000

PHS MoU Document
C-IF3.01-02-TS
VersionHistory of Revised Versions
Date
Outline01

Dec. 17, 1996

Established

02

June 7, 2000

Changed all WLL into FWA.
Sub-clause 2.1 is changed.

C-IF3.01-02-TS
PHS-FWA System : General Descriptionof Interface Specifications between Fixed Wireless Access Controller
and Service Node - Analogue Subscriber Interface
Contents
1. General .........................................................................................................................................

1

2. Interface........................................................................................................................................

1

2.1 Function .................................................................................................................................

1

2.2 DC characteristics..................................................................................................................

3

2.3 AC characteristics..................................................................................................................

3

2.4 Subscriber cable.....................................................................................................................

3

2.5 Over voltage and current protection ......................................................................................

3

3. Comments for Implementation.....................................................................................................

4

3.1 Power Feeding .......................................................................................................................

4

4. References ....................................................................................................................................

4

5. Items for Further Study ................................................................................................................

4

5.1 Test functions ........................................................................................................................

4

ANNEX A .........................................................................................................................................

5

1. Definition of Signals, Messages and Timers Examples...............................................................

5

2. State Transition Table Examples .................................................................................................

7

2.1 Individual Subscriber.............................................................................................................

7

2.2 Coin Box................................................................................................................................

7

2.3 Loop Start PBX......................................................................................................................

8

2.4 Ground Start PBX..................................................................................................................

8

2.5 DDI PBX................................................................................................................................

9

2.6 NTT individual Subscriber ....................................................................................................

10

2.7 NTT DDI PBX.......................................................................................................................

10

3. Message Sequence Examples.......................................................................................................

11

3.1 Originating-Answer (Individual DP Line Sub.) ....................................................................

11

C-IF3.01-02-TSi

ii

3.2 Originating-Answer (Individual DTMF Line Sub.) ..............................................................

12

3.3 Originating-Answer (Loop Start PBX)..................................................................................

13

3.4 Originating-Answer (Ground Start PBX)..............................................................................

14

3.5 Release-before Dialling .........................................................................................................

15

3.6 Release-during Dialling.........................................................................................................

16

3.7 Release-During Ringing ........................................................................................................

17

3.8 Call Collision.........................................................................................................................

18

3.9 Calling Party Release-Individual Sub. Originating ...............................................................

19

3.10 Called Party Release-Individual Sub. Originating .............................................................

20

3.11 Terminating-Answer...........................................................................................................

21

3.12 Terminating-Ringing Resource Hunt NG...........................................................................

22

3.13 Terminating-Answer (NTT DDI Spec.) .............................................................................

23

3.14 Terminating-Answer (DP type DDI) ..................................................................................

24

3.15 Terminating-Answer (DTMF Type DDI)...........................................................................

25

3.16 Calling Party Release-Individual Sub. Terminating...........................................................

26

3.17 Called Party Release-Individual Sub. Terminating ............................................................

27

3.18 Hooking Monitoring ...........................................................................................................

28

3.19 Meter Pulsing Signal Sending ............................................................................................

29

3.20 Connection to Howler Tone ...............................................................................................

30

C-IF3.01-02-TS

1. General
This specification describes about analogue subscriber interface between WAC and SN. As analogue
subscriber interface should be compatible for PSTN, the actual specification depends on theadministrator or operating company.

2. Interface
Following sections describe the items that should be considered in the administrator or operatingcompany’s specification regarding WAC analogue subscriber interface.
2.1 Function
WAC shall have the following functions. The administrator or operating company will decide whichfunctions should be implemented.
(1)

Voice transmission

transmit voice and modem data in both way.
(2)

Loop close sending

send the loop closed to SN.
(3)Loop open sending

send the loop open to SN.
(4)

Dial sending

send the dial pulse or DTMF to SN.
(5)

Hooking signal sending

send the hooking signal to SN.
(6)

Ringing signal detection

detect ringing signal from SN.
(7)

Ring trip

send the answer to SN during ringing signal receiving.
(8)

Over voltage and current protection

protect over voltage and current from outside.

C-IF3.01-02-TS

1

(9)

Test

Further study.
(10) Loop polarity reverse steady signal receiving
receive loop polarity reverse for answer signal.
(11) Loop polarity reverse pulse receiving
receive loop polarity reverse pulse for mate party on hook. This signal is also receipt as metering
signal.
(12) Metering signal receiving
receive metering signal. the administrator or operating company shall choose the metering signal
type.
i)

Loop polarity reverse pulse

ii)

12kHz tone pulseiii) 16kHz tone pulse(13) Ground Start Sending
send off hook for ground start PBX.
(14) Calling Line Identification Presentation (CLIP)
receive the signals for CLIP service.
(15) Tone and Signal Reception
The used tone are selected by administrator or operating company.
i)

Dial toneii)

Busy toneiii) Congestion toneiv)

Ring back tonev)

Howler tonevi)Announcement

2

C-IF3.01-02-TS

2.2 DC characteristics
The administrator or operating company shall specify the followings;(1)loop close and open impedance(2)

DP sending(3)

Hooking sending(4)

Ground start sending(5)

Loop polarity reverse pulse detection

2.3 AC characteristics
The administrator or operating company shall specify the followings;(1)

DTMF sending(2)

Ringing signal input impedance(3)

Ring trip(4)

Metering Signal Detection Characteristics(5)

CND Detection Characteristics(6)

Transmission Characteristics

i)

Transmission characteristicsii)

Echo suppression

2.4 Subscriber cable
The administrator or operating company shall specify the followings;(1)loop resistance(2)

insulation resistance(3)

capacitance between wires

2.5 Over voltage and current protectionrefer to ITU-T K.20.

C-IF3.01-02-TS

3

3. Comments for Implementation
3.1 Power Feeding

4. References(1)

ITU-T K.20

5. Items for Further Study
5.1 Test functions

4

C-IF3.01-02-TS

ANNEX A
ANNEX A describes the analogue subscriber interface of WAC application examples.

1. Definition of Signals, Messages and Timers Examples
Figure 1-1/C-IF3.01 shows the WSU functional block diagram.
Table 1-1/C-IF3.01 shows the signal definitions that are used in state transition tables.
Table 1-2/C-IF3.01 shows the state definitions that are used in state transition tables.

WAC
C-IF3.01
WCS

WCI

SN

SIF

WCI: WCS Interface
SIF: Subscriber Interface
Figure 1-1/C-IF3.01 WAC Functional Block Diagram

Table 1-1/C-IF3.01 Signal Definition
signal
SN dt
SN bt
SN howler
SN ringing
SN normal polarity
SN reverse polarity
SN loop closed
SN loop open
SN dp/dtmf
SN g on tip
SN meter pulsing signal
loop closed
loop open
dp/dtmf
normal polarity
reverse polarity
g on tip with loop
SEIZURE ACKSEIZURE NAK
RELEASEANSWERMETER PULSING
SIGNAL
REVERSE POLARITYNORMAL POLARITYTERMINATING
HOWLER
DIGIT DIAL
off hook
on hookdigit dial
normal polarity
reverse polarity

direction
meanings
SN to SIF SN sends DT to WAC.
SN to SIF SN sends BT to WAC.
SN to SIF SN sends Howler tone to WAC.
SN to SIF SN sends Ringing Signal to WAC>
SN to SIF SN makes two wire polarity normal.
SN to SIF SN makes two wire polarity reversal.
SN to SIF SN makes two wire loop closed.
SN to SIF SN makes two wire loop open.
SN to SIF SN sends digit dial to WAC using DP or DTMF.
SN to SIF SN sends ground on tip wire.
SN to SIF SN sends meter pulsing signal to WAC.
SIF to SN WAC makes two wire loop closed.
SIF to SN WAC makes two wire loop open.
SIF to SN WAC sends meter pulsing signal to SN.
SIF to SN WAC makes two wire polarity normal.
SIF to SN WAC makes two wire polarity reversal.
SIF to SN WAC sends ground on tip wire with loop closed.
SIF to WCI indicate seizure ack detection at SIF
SIF to WCI indicate seizure nak detection at SIF
SIF to WCI indicate release detection at SIF
SIF to WCI indicate answer detection at SIF
SIF to WCI indicate meter pulsing signal detection at SIF
SIF to WCI indicate reverse polarity detection at SIF
SIF to WCI indicate normal polarity detection at SIF
SIF to WCI indicate terminating detection at SIF
SIF to WCI indicate howler tone detection at SIF
SIF to WCI sends digit dial that is receipt at SIF
WCI to SIF make SIF off hook state.
WCI to SIF make SIF on hook state
WCI to SIF sends digit dial that SIF should send
WCI to SIF makes SIF normal polarity
WCI to SIF makes SIF reverse polarity

C-IF3.01-02-TS

5

Table 1-2/C-IF3.01 State Definition
state

individual LS PBXGS PBX

coin box

DDI PBXNTT
NTT DDIindividual

origination terminatio
n6loop open loop open

0

idle

loop open loop open loop open loop open loop open WCS:
normalpwr
SN:normalpwr

1

off hook

loop closed loop closed
loop closed loop closed loop closed loop closed loop closed WCS:
reversepwr
SN:loop closed

2

terminating

ringingsignalreception

ringingsignalreception

ringingsignalreception

ringingsignalreception

ringingsignalreception

ringing
WCS:
signalnormalreceptionpwr
SN:loop closed

ringingsignalreception

3

clear forward reception

none

none

none

none

none

none
WCS:
reversepwr
SN:loop opennone

4clear back sending

none

none

none

none

none

none
WCS:
normalpwr
SN:loop opennone

C-IF3.01-02-TS

2. State Transition Table Examples
2.1 Individual Subscriber
Table 2-1/C-IF3.01 shows the WAC analogue subscribe interface state transition table for individual
subscriber.
Table 2-1/C-IF3.01 Interface State Transition Table, Individual subscriber
state
event
SN dt
SN bt
SN howler
SN ringing
SN normal polarity
SN reverse polarity
SN loop closed
SN loop open
SN dp/dtmf
SN g on tip
SN meter pulsing
signaloff hook
on hookdigit dial
reverse polarity
normal polarity

ST 0

ST 1

ST 2

/
/
/
TERMINATING,
ST 2
/
/
/
/
/
/
/

SEIZURE ACK
/
/
/

/
/
/
/

/
/
/
/
/
/
/

/
/
/
/
/
/
/

loop closed, ST 1/
loop closed, ST 1/
loop closed, ST 0//
dp/dtmf
/
/
/
/
/
/
/

- = No state change; / = Unexpected event, no state change;

2.2 Coin Box
Table 2-2/C-IF3.01 shows the WAC analogue subscribe interface state transition table for coin box.
Table 2-2/C-IF3.01 Interface State Transition Table, Coin Box
state
event
SN dt
SN bt
SN howler
SN ringing
SN normal polarity
SN reverse polarity
SN loop closed
SN loop open
SN dp/dtmf
SN g on tip
SN meter pulsing
signaloff hook
on hookdigit dial
reverse polarity
normal polarity

ST 0

ST 1

ST 2

/
/
/
TERMINATING,
ST 2
/
/
/
/
/
/
/

SEIZURE ACK
/
/
/

/
/
/
/

/
/
/
/
/
/
/
/
/
/
/
/
METER
/
PULSING
SIGNALloop closed, ST 1/
loop closed, ST 1/
loop closed, ST 0//
dp/dtmf
/
/
/
/
/
/
/

- = No state change; / = Unexpected event, no state change;

C-IF3.01-02-TS7

2.3 Loop Start PBXTable 2-3/C-IF3.01 shows the WAC analogue subscribe interface state transition table for loop start
PBX.
Table 2-3/C-IF3.01 Interface State Transition Table, Loop Start PBX
state
event
SN dt
SN bt
SN howler
SN ringing
SN normal polarity
SN reverse polarity
SN loop closed
SN loop open
SN dp/dtmf
SN g on tip
SN meter pulsing
signaloff hook
on hookdigit dial
reverse polarity
normal polarity

ST 0

ST 1

ST 2

SEIZURE ACK//TERMINATING,ST 2
NORMAL
POLARITY/SEIZURE ACK
/
/
/

/
/
/
/
/

/
/
/
/
/

NORMAL
POLARITY
REVERSEPOLARITY
/
/
/
/
/

/
/
/
/
/

loop closed, ST 1
/
/
/
/

/
loop open, ST 0
dp/dtmf//

loop closed, ST 1
/
/
/
/

/

- = No state change; / = Unexpected event, no state change;
2.4 Ground Start PBXTable 2-4/C-IF3.01 shows the WAC analogue subscribe interface state transition table for groundstart PBX.
Table 2-4/C-IF3.01 Interface State Transition Table, Ground Start PBX
state
event
SN dt
SN bt
SN howler
SN ringing
SN normal polarity
SN reverse polarity
SN loop closed
SN loop open
SN dp/dtmf
SN g on tip
SN meter pulsing
signaloff hook
on hookdigit dial
reverse polarity
normal polarity

ST 0

ST 1

ST 2

SEIZURE ACK//TERMINATING,ST 2
NORMAL
POLARITY/SEIZURE ACK
/
/
/

/
/
/
/

NORMAL
POLARITY
REVERSEPOLARITY
/
/
/
/
/

/

/
/
/
/
/

/

loop closed, ST 1

loop open andremove g on tip,
ST 0
dp/dtmf
/
/

/

/
/
/
/
/
g on tip with loop,
ST 1
/

/
/
/

- = No state change; / = Unexpected event, no state change;

8

C-IF3.01-02-TS

/

/
/
/

2.5 DDI PBXTable 2-5/C-IF3.01 (1/2) shows the WAC analogue subscribe interface state transition table for DDI
PBX, originating.
Table 2-5/C-IF3.01 (2/2) shows the WAC analogue subscribe interface state transition table for DDI
PBX, terminating.
Table 2-5/C-IF3.01 (1/2) Interface State Transition Table, DDI PBX, Originating
state
ST 0
event
SN dt
SEIZURE ACK
SN bt/
SN howler/
SN ringing/
SN normal polarity
NORMAL
POLARITY
SN reverse polarity/
SN loop closed
SN loop open
SN dp/dtmf
SN g on tip
SN meter pulsing
signaloff hook
on hookdigit dial
reverse polarity
normal polarity

ST 1

/
/
/
/
/

SEIZURE ACK///NORMAL
POLARITY
REVERSEPOLARITY/////

loop closed, ST 1
/
/
/
/

/
loop open, ST 0
dp/dtmf//- = No state change; / = Unexpected event, no state change;
Table 2-5/C-IF3.01 (2/2) Interface State Transition Table, DDI PBX, Terminating
state
ST 0
ST 1
event
SN dt
/
/
SN bt
/
/
SN howler//
SN ringing//
SN normal polarity//
SN reverse polarity//
SN loop closed
TERMINATING,/
ST 2
SN loop open/
RELEASE, ST 3
SN dp/dtmf//
SN g on tip//
SN meter pulsing//
signaloff hook//
on hook//digit dial//
reverse polarity//
normal polarity-/

normal polarity,
ST 4

ST 2

ST 3

ST 4

/
/
/
/
/
/
/

/
/
/
/
/
/
/

/
/
/
/
/
/
/

/
DIGIT DIAL
/
/

/
/
/
/

RELEASE, ST 0
/
/
/

/
/
/
reverse polarity,
ST 1
/

/
/
/
/

/
/
/
reverse polarity,
ST 1/

normal polarity,
ST 0= No state change; / = Unexpected event, no state change;

C-IF3.01-02-TS

9

2.6 NTT individual Subscriber
State transition table of NTT individual subscriber is same as loop start PBX
2.7 NTT DDI PBXState transition table of NTT DDI PBX, originating is same as loop start PBX.
Terminating table is in table 2-6/C-IF3.01

Table 2-6/C-IF3.01 Interface State Transition Table, NTT DDI PBX, Terminating
state
event
SN dt
SN bt
SN howler
SN ringing
SN normal polarity
SN reverse polarity
SN loop closed
SN loop open
SN dtmf
SN g on tip
SN meter pulsing
signaloff hook
on hookdigit dial
reverse polarity
normal polarity

ST 0

ST 1

ST 2

/
/
/
TERMINATING,
ST 2/
REVERSEPOLARITY
/
/
/
/
/

/
/
/
/

/
/
/
/

/
/

/
/

/
/
DIGIT SIGNAL
/
/

/
/
/
/
/

/
loop open, ST 0//
NORMAL
POLARITY

loop closed, ST 1////

loop closed, ST 1////

- = No state change; / = Unexpected event, no state change;

10

C-IF3.01-02-TS

3. Message Sequence Examples
3.1 Originating-Answer (Individual DP Line Sub.)
Figure 3-1/C-IF3.01 shows a WIF3 sequence of originating answer (Individual DP Line Subscriber).

SN

WAC

seizure (loop closed)

R: Vbat
T: G

seizure ack (DT)

1st pulse of 1st digit (DP)dial ack(DT detach)rest pulses of 1st digit, 2nd to final digit
dial (DP)(RBT)

answer (RBT detach)communication in progress

Figure 3-1/C-IF3.01 Originating - Answer (Individual DP Line Sub.)

C-IF3.01-02-TS

11

3.2 Originating-Answer (Individual DTMF Line Sub.)
Figure 3-2/C-IF3.01 shows a WIF3 sequence of originating answer (Individual DTMF Line
Subscriber).
WAC

SN

seizure (loop closed)

R: Vbat
T: G

seizure ack (DT)

1st digit dial (DTMF)

dial ack(DT detach)

2nd to final digit dial (DTMF)(RBT)

answer (RBT detach)communication in progress

Figure 3-2/C-IF3.01 Originating - Answer (Individual DTMF Line Sub.)

12

C-IF3.01-02-TS

3.3 Originating-Answer (Loop Start PBX)
Figure 3-3/C-IF3.01 shows a WIF3 sequence of originating answer (Loop Start PBX).

WAC

SN

seizure (loop closed)

R: Vbat
T: G

seizure ack (DT)

1st digit dial (DP/DTMF)

dial ack(DT remove)

2nd to final digit dial (DP/DTMF)(RBT)

answer(RBT remove, reverse polarity)
R: G
T: Vbatcommunication in progress

Figure 3-3/C-IF3.01 Originating - Answer (Loop Start PBX)

C-IF3.01-02-TS

13

3.4 Originating-Answer (Ground Start PBX)
Figure 3-4/C-IF3.01 shows a WIF3 sequence of originating answer (Ground Start PBX).

WAC

SN

seizure(ground on T with loop)

R: VbatT: openseizure ack(G on T)(DT)

R: Vbat
T: G

1st digit dial (DP/DTMF)
dial ack(DT remove)
2nd to final digit dial(DP/DTMF)(RBT)
answer(RBT remove, reverse polarity)communication in progress

R: G
T: VbatFigure 3-4/C-IF3.01 Originating - Answer (Ground Start PBX)

14

C-IF3.01-02-TS

3.5 Release-before Dialling
Figure 3-5/C-IF3.01 shows a WIF3 sequence of release before dialling.

WAC

SN

seizure (loop closed)

R: Vbat
T: G

seizure ack (DT)clear forward (loop open)

Figure 3-5/C-IF3.01 Release - before Dialling

C-IF3.01-02-TS

15

3.6 Release-during Dialling
Figure 3-6/C-IF3.01 shows a WIF3 sequence of release during dialling.

WAC

SN

seizure (loop on)

seizure ack (DT)

1st digit dial (DP/DTMF)

dial ack(DT detach)

2nd to final digit dial (DP/DTMF)

clear forward (loop open)

Figure 3-6/C-IF3.01 Release - during Dialling

16

C-IF3.01-02-TS

R: Vbat
T: G

3.7 Release-During Ringing
Figure 3-7/C-IF3.01 shows a WIF3 sequence of release during ringing.

WAC

SN

seizure (loop closed)

R: Vbat
T: G

seizure ack (DT)

1st digit (DTMF)

dial ack(DT detach)

2nd to final digit dial (DTMF)(RBT)

clear forward (loop open)

Figure 3-7/C-IF3.01 Release - during Ringing

C-IF3.01-02-TS

17

3.8 Call Collision
Figure 3-8/C-IF3.01 shows a WIF3 sequence of call collision.

(This sequence is completely same as originating sequence.)

Figure 3-8/C-IF3.01 Call Collision

18

C-IF3.01-02-TS

3.9 Calling Party Release-Individual Sub. Originating
Figure 3-9/C-IF3.01 shows a WIF3 sequence of calling party release individual subscriber
originating.

WAC

SN
R: Vbat
T: G
communication in progressclear forward (loop
open)

Figure 3-9/C-IF3.01 Calling Party Release - Individual Sub Originating
C-IF3.01-02-TS

19

3.10 Called Party Release-Individual Sub. Originating
Figure 3-10/C-IF3.01 shows a WIF3 sequence of called party release individual subscriber
originating.

WAC

SN
R: Vbat
T: G

communication in progresscalled party
releaseBT

release guard timing

clear forward (loop open)

Figure 3-10/C-IF3.01 Called Party Release - Individual Sub Originating

20

C-IF3.01-02-TS

3.11 Terminating-Answer
Figure 3-11/C-IF3.01 shows a WIF3 sequence of terminating answer.

WAC

SN

ringing

answer (loop closed)

communication in progress

Figure 3-11/C-IF3.01 Terminating - Answer

C-IF3.01-02-TS

21

3.12 Terminating-Ringing Resource Hunt NG
Figure 3-12/C-IF3.01 shows a WIF3 sequence of terminating ringing resource hunt NG.
WAC

SN

ringing

ringing stopringing time out

Figure 3-12/C-IF3.01 Terminating - Ringing Resource Hunt NG

22

C-IF3.01-02-TS

3.13 Terminating-Answer (NTT DDI Spec.)
Figure 3-13/C-IF3.01 shows a WIF3 sequence of terminating answer (NTT DDI Specification).

WAC

SN

seizure(reverse polarity)
ringing

1st answer (loop closed)

signalling(DTMF)
signalling ack(loop open)

2nd answer (loop closed)

2nd answer ack (normal polarity)communication in progress

Figure 3-13/C-IF3.01 Terminating - Answer (NTT DDI Spec)

C-IF3.01-02-TS

23

3.14 Terminating-Answer (DP type DDI)
Figure 3-14/C-IF3.01 shows a WIF3 sequence of terminating answer (DP type DDI).

WAC
R: Vbat
T: G

SNseizure(loop closed)
signalling(DP)R: Vbat
T: G
R, T loop

answer (reverse polarity)
R: G
T: Vbatcommunication in progress

Figure 3-14/C-IF3.01 Terminating - Answer (DP Type DDI)

24

C-IF3.01-02-TS

3.15 Terminating-Answer (DTMF Type DDI)
Figure 3-15/C-IF3.01 shows a WIF3 sequence of terminating answer (DTMF type DDI).
WAC
R: Vbat
T: G

SNseizure(loop closed)
signalling(DTMF)

R: Vbat
T: G
R, T loop

answer (reverse polarity)
R: G
T: Vbatcommunication in progress

Figure 3-15/C-IF3.01 Terminating - Answer (DTMF Type DDI)

C-IF3.01-02-TS25

3.16 Calling Party Release-Individual Sub. Terminating
Figure 3-16/C-IF3.01 shows a WIF3 sequence of calling party release individual subscriber
terminating.

WAC

SN
R: Vbat
T: G

communication in progresscalling party
releaseBT

clear back (loop open)

Figure 3-16/C-IF3.01 Calling Party Release - Individual Sub Terminating
26

C-IF3.01-02-TS

3.17 Called Party Release-Individual Sub. Terminating
Figure 3-17/C-IF3.01 shows a WIF3 sequence of called party release individual subscriber
terminating.

WAC

SN
R: Vbat
T: G

communication in progressclear back (loop open)

Figure 3-17/C-IF3.01 Called Party Release - Individual Sub Terminating

C-IF3.01-02-TS

27

3.18 Hooking Monitoring
Figure 3-18/C-IF3.01 shows a WIF3 sequence of hooking monitoring.

WAC

SN
R: Vbat
T: G
communication in progress

loop open

Hookingloop closed

Figure 3-18/C-IF3.01 Hooking Monitoring

28

C-IF3.01-02-TS

3.19 Meter Pulsing Signal Sending
Figure 3-19/C-IF3.01 shows a WIF3 sequence of meter pulsing signal sending.

WAC

SN

seizure (loop closed)

R: Vbat
T: G

seizure ack (DT)

1st digit dial (DP/DTMF)

dial ack(DT remove)

2nd to final digit dial (DP/DTMF)(RBT)

answer (RBT detach)meter pulsing signal
meter pulsing signal(pulsed reverse polarity or
12 kHz tone or 16 kHz
tone, sending periodicallyaccording to the calling rateduring communication inprogress state.)
meter pulsing signal

Figure 3-19/C-IF3.01 Meter Pulsing Signal Sending

C-IF3.01-02-TS29

3.20 Connection to Howler Tone
Figure 3-20/C-IF3.01 shows a WIF3 sequence of connection to howler tone.

WAC

SN
R: Vbat
T: G
communication in progresscalled party
releaseBT

detach BT, attach Howler

release guard timing

BT timing

Howler tone timing
detach Howler

Figure 3-20/C-IF3.01 Connection to Howler Tone30

C-IF3.01-02-TS