Nortel TFC002 Manuale utente

Centralized Attendant Service Description and engineering

Meridian 1

Centralized Attendant Service

Description and engineering

Document Number: 553-2681-100

Document Release: Standard 5.00

Date: August 1996

Year Publish FCCTM

Printed in the United States of America

Information is subject to change without notice. Northern Telecom reserves the right to make changes in design

or components as progress in engineering and manufacturing may warrant.This equipment has been tested

and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC rules, and the

radio interference regulations of Industry Canada.These limits are designed to provide reasonable protection

against harmful interference when the equipment is operated in a commercial environment.This equipment

generates, uses and can radiate radio frequency energy, and if not installed and used in accordance with the

instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a

residential area is likely to cause harmful interference in which case the user will be required to correct the

interference at their own expense.

SL-1 and Meridian 1 are trademarks of Northern Telecom.

Page iii of xii

Centralized Attendant Service Description and engineering

Revision history

August 1996 Standard, Release 5.00. Reissued for X11 Release 22.0x.

December 1994 Standard, Release 4.00. Reissued to include editorial changes and indexing.

Due to the extent of the changes, revision bars are not used.

December 1992 Standard, Release 3.00. This document is reissued to include technical

content updates. Revision bars are omitted.

December 1991 Standard, Release 2.00. This document is reissued to include technical

content updates. Due to the extent of changes, revision bars are omitted.

December 1990 Standard, Release 1.00. Reissued for compliance with Northern Telecom

standard 164.0.

Page

v of xii

Centralized Attendant Service Description and engineering

Contents

Feature description . . . . . . . . . . . . . . . . . . . . . . . . . 1

Feature packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Feature interactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Call Waiting Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Camp-On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Conference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Coordinated Dialing Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Departmental Directory Number . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Dial “0” calls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Directory Number Expansion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Flexible Attendant Directory Number . . . . . . . . . . . . . . . . . . . . . . . 9

Listed Directory Number calls . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Message Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Night Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Property Management System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Recorded Overflow Announcement . . . . . . . . . . . . . . . . . . . . . . . . 11

Remote Peripheral Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Room Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Silent Hold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Station Category Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Timed Reminder Recall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Transfer to Attendant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Trunk Group Busy Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Equipment specification and operation . . . . . . . . 15

Tone and Digit Switch cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Page

vi of xii

Contents

553-2681-100 Standard 5.00 August 1996

Release Link Trunk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

QPC250 Release Link Trunk specifications . . . . . . . . . . . . . . . . . . 17

Operation at the Remote site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Operation at the Main site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Installation and connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Engineering information . . . . . . . . . . . . . . . . . . . . 25

Memory and real-time requirements . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Traffic measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Trunks (TFC002) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Queue (TFC003) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Console (TFC004) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Calculating the number of RLT circuits . . . . . . . . . . . . . . . . . . . . . . . 28

Calculating the number of CAS attendants . . . . . . . . . . . . . . . . . . . 30

Implementation and operation . . . . . . . . . . . . . . . 47

Feature implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

CAS Main . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

CAS Remote . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Main operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Remote operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Page

vii of xii

Centralized Attendant Service Description and engineering

List of figures

Figure 1

Typical CAS configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Figure 2

QPC250 RLT cross-connections to QPC70 CO trunk . . . . . . . . . . . . . 23

Figure 3

TFC003 measurements at a Remote site when a call waits for an

RLT to become idle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Page ix of xii

Centralized Attendant Service Description and engineering

xii

List of tables

Table 1

Meridian 1 precise tones with CAS . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 2

Meridian 1 tone interruptions with CAS . . . . . . . . . . . . . . . . . . . . . . . 16

Table 3

Release Link Trunk requirements

Average speed of answer ≤2.00 seconds; average RLT delay ≤2.00

seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Table 4

Release Link Trunk requirements

Average speed of answer ≤2.00 seconds; average RLT delay ≤4.00

seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Table 5

Release Link Trunk requirements

Average speed of answer ≤2.00 seconds; average RLT delay ≤6.00

seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Table 6

Release Link Trunk requirements

Average speed of answer ≤4.00 seconds; average RLT delay ≤2.00

seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Table 7

Release Link Trunk requirements

Average speed of answer ≤4.00 seconds; average RLT delay ≤4.00

seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Page x of xii List of tables

553-2681-100 Standard 5.00 August 1996

Table 8

Release Link Trunk requirements

Average speed of answer ≤4.00 seconds; average RLT delay ≤6.00

seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Table 9

Release Link Trunk requirements

Average speed of answer ≤5.00 seconds; average RLT delay ≤2.00

seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Table 10

Release Link Trunk requirements

Average speed of answer ≤5.00 seconds; average RLT delay ≤4.00

seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Table 11

Release Link Trunk requirements

Average speed of answer ≤5.00 seconds; average RLT delay ≤6.00

seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Table 12

Release Link Trunk requirements

Average speed of answer ≤6.00 seconds; average RLT delay ≤2.00

seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Table 13

Release Link Trunk requirements

Average speed of answer ≤6.00 seconds; average RLT delay ≤4.00

seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Table 14

Release Link Trunk requirements

Average speed of answer ≤6.00 seconds; average RLT delay ≤6.00

seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Table 15

Release Link Trunk requirements

Average speed of answer ≤8.00 seconds; average RLT delay ≤2.00

seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Table 16

Release Link Trunk requirements

Average speed of answer ≤8.00 seconds; average RLT delay ≤4.00

seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

List of tables Page xi of xii

Centralized Attendant Service Description and engineering

Table 17

Release Link Trunk requirements

Average speed of answer ≤8.00 seconds; average RLT delay ≤6.00

seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Table 18

Release Link Trunk requirements

Average speed of answer ≤10.00 seconds; average RLT delay ≤2.00

seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Table 19

Release Link Trunk requirements

Average speed of answer ≤10.00 seconds; average RLT delay ≤4.00

seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Table 20

Release Link Trunk requirements

Average speed of answer ≤10.00 seconds; average RLT delay ≤6.00

seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Table 21

CAS attendant requirements

Average speed of answer ≤2.00 seconds . . . . . . . . . . . . . . . . . . . . . . . 41

Table 22

CAS attendant requirements

Average speed of answer ≤4.00 seconds . . . . . . . . . . . . . . . . . . . . . . . 42

Table 23

CAS attendant requirements

Average speed of answer ≤5.00 seconds . . . . . . . . . . . . . . . . . . . . . . . 43

Table 24

CAS attendant requirements

Average speed of answer ≤6.00 seconds . . . . . . . . . . . . . . . . . . . . . . . 44

Table 25

CAS attendant requirements

Average speed of answer ≤8.00 seconds . . . . . . . . . . . . . . . . . . . . . . . 45

Table 26

CAS attendant requirements

Average speed of answer ≤10.00 seconds . . . . . . . . . . . . . . . . . . . . . . 46

Page 1 of 64

Centralized Attendant Service Description and engineering

Feature description

The Centralized Attendant Service (CAS) feature allows customers with

multiple locations to centralize their attendant services at a single location. A

typical CAS configuration consists of one or more Remote locations, each

served by its own switch and attendants, and a Main site location, where the

CAS attendants are located (see Figure 1). Each Remote location has access

to the Main CAS attendant through Release Link Trunks (RLT), which can

be either analog or digital. In addition, the Remote locations are

interconnected by TIE trunks.

The types of calls that require attendant assistance and can be handled by a

CAS attendant are as follows:

— Listed Directory Number (LDN) calls

— Dial “0” calls (“0” is optional if the Flexible Attendant Directory

Number is used)

— Recalls, intercepts, or transfers to attendant

— Operator-assisted calls for restricted telephones, giving access to

wide-area transmission service (WATS), Foreign Exchange (FX), and

Central Office (CO) trunks

When any of the preceding calls are placed, an idle Release Link Trunk

(RLT) at the Remote site is seized and the calls are presented to the CAS

attendant. If an idle RLT is not available, the calls are queued until one

becomes available. The CAS attendant can extend the call to a local or

Remote telephone.

Page 2 of 64

Feature description

553-2681-100 Standard 5.00 August 1996

When a call is released by the attendant, the RLT is released. Information

tones sent from the Remote site allow the CAS attendant to identify the type

of incoming call and to confirm features, such as Camp-On, during call

processing.

The system can serve as either a Main or a Remote site. Operation is

compatible with

AT&T Technical Advisory Manual 10

(TA-10). CAS is

therefore compatible with any system that meets the specifications in that

document.

Figure 1

Typical CAS configuration

Remote

PBX

Attendant

Remote

PBX

Attendant

Main

PBX

CAS

Attendant

Remote

PBX

Attendant

Tie trunks

RLT

Release Link

Trunk(s) (RLT)

Tie trunks

553-4030

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