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Meridian 1
Centralized Attendant Service
Description and engineering
Document Number: 553-2681-100
Document Release: Standard 5.00
Date: August 1996
Year Publish FCC TM
© 1979, 1996
All rights reserved
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.
Centralized Attendant Service
Description and engineering
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Related Manuals for Nortel TFC002
Summary of Contents for Nortel TFC002
- Page 1 Meridian 1 Centralized Attendant Service Description and engineering Document Number: 553-2681-100 Document Release: Standard 5.00 Date: August 1996 Year Publish FCC TM © 1979, 1996 All rights reserved 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.
- Page 2 Page iii of xii 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.
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Page 3: Table Of Contents
Page v of xii Contents Feature description ......Feature packaging ........Feature interactions . - Page 4 Trunks (TFC002) ........
- Page 5 Page vii of xii List of figures Figure 1 Typical CAS configuration ....... . . Figure 2 QPC250 RLT cross-connections to QPC70 CO trunk .
- Page 6 Page ix of xii List of tables Table 1 Meridian 1 precise tones with CAS ......Table 2 Meridian 1 tone interruptions with CAS .
- Page 7 Page x of xii List of tables Table 8 Release Link Trunk requirements Average speed of answer ≤ 4.00 seconds; average RLT delay ≤ 6.00 seconds ..........Table 9 Release Link Trunk requirements Average speed of answer ≤...
- Page 8 List of tables Page xi of xii Table 17 Release Link Trunk requirements Average speed of answer ≤ 8.00 seconds; average RLT delay ≤ 6.00 seconds ..........Table 18 Release Link Trunk requirements Average speed of answer ≤...
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Page 9: Feature Description
Page 1 of 64 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). - Page 10 Page 2 of 64 Feature description 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.
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Page 11: Feature Packaging
Feature description Page 3 of 64 The attendant at the Remote location is automatically assigned a separate CAS key/lamp pair above the fifth loop key to control the CAS feature. Additionally, a signal remote key is automatically assigned above the fifth loop key on the consoles at the CAS Main location. - Page 12 Page 4 of 64 Feature description Attendant End-to-End Signaling Pressing the CAS key, while using Attendant End-to End-Signaling (AEES), may block the DTMF tones. Attendant Overflow Position CAS and Attendant Overflow Position (AOP) are incompatible with each other. If both are enabled, CAS takes precedence over AOP. Automatic Identification of Outward Dialing When Automatic Identification of Outward Dialing (AIOD) using the data-link method is used in conjunction with CAS, each location must be...
- Page 13 Feature description Page 5 of 64 Barge-In and Busy Verify CAS attendants are able to “barge-in” on trunks located at the Main location and busy-verify telephones at the Main location, but are not able to perform these functions for Remote locations. The local console at each Remote location can barge-in or busy-verify its local trunks and telephones.
- Page 14 Page 6 of 64 Feature description — Downstream processing of the CDR tapes must correlate tandem calls from a Remote site through the Main site by means of TIE trunks to special services. A record showing the facilities used or telephones involved in any tandem connection is given separately for each location.
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Page 15: Call Waiting Indication
Feature description Page 7 of 64 — The Call Transfer feature operates according to the capabilities of the system on which the call transfer is being attempted. — Disconnect supervision must either be provided by the incoming CO trunk or be repeated by the TIE trunk from the Remote site. If not, the Meridian 1 disallows these types of connections. -
Page 16: Conference
Page 8 of 64 Feature description Conference Attendant-controlled conference connections, involving telephones or trunks, require TIE trunk connections between the Main and Remote locations for each Remote party. RLTs cannot be conferenced. TIE trunk networks must be engineered with this fact considered. Attendants must be trained to conference through TIE trunks, as well as to handle potential difficulties with transmission and supervision. -
Page 17: Flexible Attendant Directory Number
Feature description Page 9 of 64 Flexible Attendant Directory Number Each Remote location can be assigned two attendant DNs to provide access to the attendants. The Customer Data Block (LD15) allows the modification of these two DNs. The DN assigned must be a DN taken from the numbering plan and must not conflict with any other DN. -
Page 18: Message Registration
Page 10 of 64 Feature description After obtaining the desired party’s number, the CAS attendant presses the signal Remote (SIG REM) key, which is assigned automatically and is located above the LPK 5 key. The Main site responds by sending a timed flash over the RLT to the Remote site. -
Page 19: Property Management System
Feature description Page 11 of 64 When Night Service is activated at a Remote site, any calls in the RLT queue are automatically rerouted to the assigned night-answer location or TAFAS, as applicable. Calls in progress on the RLT are completed by the CAS attendants. -
Page 20: Station Category Indication
Page 12 of 64 Feature description When the attendant decides to place the call on hold, the attendant presses the signal Remote (SIG REM) key to send a flash to the RLT. The attendant receives a dial tone from the Remote site and dials the DN assigned for the Silent Hold code. - Page 21 Feature description Page 13 of 64 If the calling party wishes to continue waiting, the CAS attendant at the Main location releases. Disconnect is detected at the Remote site, and the RLT connection is removed. Further timed recalls cause the preceding process to be repeated until either the called telephone answers or the calling party disconnects.
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Page 22: Transfer To Attendant
Page 14 of 64 Feature description Transfer to Attendant The CAS attendant can be recalled by a telephone in order to transfer a trunk to another telephone. The call is presented to the CAS attendant in the same manner as a dial “0” call. The CAS attendant transfers the call by operating the release destination (RLS DEST) key and then following the procedure for an LDN call. -
Page 23: Equipment Specification And Operation
Page 15 of 64 Equipment specification and operation Tone and Digit Switch cards A Remote site that is arranged for the CAS feature requires the QPC251 Tone and Digit Switch (TDS) card, the QPC609 TDS card, or the NT8D17 conference/TDS card. At the Remote site, all TDS cards must be the same type;... -
Page 24: Release Link Trunk
Page 16 of 64 Equipment specification and operation Table 2 Meridian 1 tone interruptions with CAS Tone Cadence Listed Directory Number 100 ms of 480 Hz 100 ms of 440 Hz 100 ms of 480 Hz Camp-on 100 ms on/off Dial “0”... -
Page 25: Qpc250 Release Link Trunk Specifications
Equipment specification and operation Page 17 of 64 An RLT circuit consists of a trunk circuit at a Remote private branch exchange (site) to be served by a CAS attendant and an interfacing trunk circuit at the Main site, where the CAS attendant is located. The type of circuit pack that can be used at either the Remote site or the Main site depends on the distance between the Remote site and the Main site. - Page 26 Page 18 of 64 Equipment specification and operation Outgoing seizure Upon seizure of the RLT by the Remote site, the RLT provides ground on the tip lead and a battery on the ring lead, and it waits 256 ms. If the DC resistance across the tip and ring leads is greater than 20-K Ω, the site provides steady ringing superimposed with –48-V battery through up to 220 Ω...
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Page 27: Operation At The Main Site
Equipment specification and operation Page 19 of 64 The RLT recognizes an increase in the DC resistance across the tip and ring leads from 1300 Ω or less to 20-K Ω or more as an on hook signal. The on hook signal should be timed for 200 ms to 1.0 second. - Page 28 Page 20 of 64 Equipment specification and operation Incoming seizure The CO trunk at the Main site detects seizure by an RLT at a Remote site when the RLT simultaneously provides — a ground through 1.2-K Ω of resistance or less on the tip lead —...
- Page 29 Equipment specification and operation Page 21 of 64 Flash signal When the CAS attendant presses the Signal Remote (SIG REM) key on the console, a timed flash (on hook) signal is sent to the Remote site. The flash signal changes the resistance across the tip and ring leads from low (off hook) to high (on hook) resistance for a timed interval.
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Page 30: Installation And Connections
Page 22 of 64 Equipment specification and operation Installation and connections The QPC250 RLT circuit pack can be inserted into any trunk-pack position on a peripheral equipment (PE) shelf. The circuit-pack handling precautions must be observed when installing trunk packs in PE shelves. Installation procedures for trunk-circuit packs are provided in Meridian 1 system installation procedures. - Page 31 PE shelf PE shelf Outside plant Part of Part of 25-pair cable 25-pair Part of Part of QPC250 pairs cable cable QPC70 CO shelf shelf RLT pack trunk pack wiring wiring harness harness T0.9 (W-BL) (W-BL) R0.9 (BL-W) (BL-W) Unit Unit T0.6 (W-G)
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Page 32: Engineering Information
At each Remote location, Release Link Trunks (RLTs) are considered an outgoing trunk route. Outgoing usage and peg counts are accumulated for traffic schedule TFC002. All other fields in this traffic schedule are zeroed. At the Main location, RLTs are considered an incoming trunk route for each Remote location. -
Page 33: Queue (Tfc003)
Page 26 of 64 Engineering information Queue (TFC003) If the CAS feature is not active, queue measurements are recorded at the Main and Remote locations in the normal manner. When the CAS feature is active, calls that originate at the Remote site and are handled over an RLT by the CAS attendant at the Main location are measured and recorded in TFC003 at the Remote site. -
Page 34: Console (Tfc004)
Engineering information Page 27 of 64 Figure 3 TFC003 measurements at a Remote site when a call waits for an RLT to become idle Call presented to the remote PBX Call leaves the (LDN, dial 0, etc.) queue and is and is placed in presented to an CAS attendant... -
Page 35: Calculating The Number Of Rlt Circuits
Page 28 of 64 Engineering information Calculating the number of RLT circuits To calculate the number of RLT circuits required between a particular Remote site and the Main site, the following grades of service must be specified. Tables 3 through calculate the RLT requirements. - Page 36 Engineering information Page 29 of 64 The engineering procedure is as follows: Calculate the attendant traffic (Ta) generated at the Remote site by using this formula: Ta = τ x AWT/100 CCS. τ = the number of calls per hour in the Remote site that require an attendant AWT = attendant work time Select the appropriate table...
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Page 37: Calculating The Number Of Cas Attendants
Page 30 of 64 Engineering information Calculating the number of CAS attendants To calculate the number of attendants required at the Main site that are serving multiple Remote sites, the Average Speed of Answer grade of service must be specified. This delay constitutes the average time in seconds that a call coming from either a Remote site or the Main site, and requiring an attendant, waits at the site for an attendant to answer. -
Page 38: Release Link Trunk Requirements Average Speed Of Answer ≤ 2.00 Seconds; Average Rlt Delay
Engineering information Page 31 of 64 Example: Average speed of answer = 2 s grade of service Attendant work time (AWT) = 20 s Attendant traffic (Ta) at Main site = 170 CCS Attendant traffic (Ta) at Remote site #1 = 100 CCS Attendant traffic (Ta) at Remote site #2 = 120 CCS Then Tt = 170 + 100 + 120 CCS... -
Page 39: Release Link Trunk Requirements Average Speed Of Answer ≤ 2.00 Seconds; Average Rlt Delay
Page 32 of 64 Engineering information Table 4 Release Link Trunk requirements Average speed of answer ≤ 2.00 seconds; average RLT delay ≤ 4.00 seconds Attendant work time (AWT) in seconds 1–5 6–10 11–15 16–20 21–25 26–30 31–35 36–40 41–45 46–50 51–55 56–60 circuits needed Attendant traffic (Ta) in CCS... -
Page 40: Release Link Trunk Requirements Average Speed Of Answer ≤ 4.00 Seconds; Average Rlt Delay
Engineering information Page 33 of 64 Table 6 Release Link Trunk requirements Average speed of answer ≤ 4.00 seconds; average RLT delay ≤ 2.00 seconds Attendant work time (AWT) in seconds circuits 1–5 6–10 11–15 16–20 21–25 26–30 31–35 36–40 41–45 46–50 51–55 56–60 needed Attendant traffic (Ta) in CCS Table 7... -
Page 41: Release Link Trunk Requirements Average Speed Of Answer ≤ 4.00 Seconds; Average Rlt Delay
Page 34 of 64 Engineering information Table 8 Release Link Trunk requirements Average speed of answer ≤ 4.00 seconds; average RLT delay ≤ 6.00 seconds Attendant work time (AWT) in seconds circuits 1–5 6–10 11–15 16–20 21–25 26–30 31–35 36–40 41–45 46–50 51–55 56–60 needed Attendant traffic (Ta) in CCS Table 9... -
Page 42: Release Link Trunk Requirements Average Speed Of Answer ≤ 5.00 Seconds; Average Rlt Delay
Engineering information Page 35 of 64 Table 10 Release Link Trunk requirements Average speed of answer ≤ 5.00 seconds; average RLT delay ≤ 4.00 seconds Attendant work time (AWT) in seconds circuits 1–5 6–10 11–15 16–20 21–25 26–30 31–35 36–40 41–45 46–50 51–55 56–60 needed Attendant traffic (Ta) in CCS Table 11... -
Page 43: Release Link Trunk Requirements Average Speed Of Answer ≤ 6.00 Seconds; Average Rlt Delay
Page 36 of 64 Engineering information Table 12 Release Link Trunk requirements Average speed of answer ≤ 6.00 seconds; average RLT delay ≤ 2.00 seconds Attendant work time (AWT) in seconds circuits 1–5 6–10 11–15 16–20 21–25 26–30 31–35 36–40 41–45 46–50 51–55 56–60 needed Attendant traffic (Ta) in CCS Table 13... -
Page 44: Release Link Trunk Requirements Average Speed Of Answer ≤ 6.00 Seconds; Average Rlt Delay
Engineering information Page 37 of 64 Table 14 Release Link Trunk requirements Average speed of answer ≤ 6.00 seconds; average RLT delay ≤ 6.00 seconds Attendant work time (AWT) in seconds circuits 1–5 6–10 11–15 16–20 21–25 26–30 31–35 36–40 41–45 46–50 51–55 56–60 needed Attendant traffic (Ta) in CCS Table 15... -
Page 45: Release Link Trunk Requirements Average Speed Of Answer ≤ 8.00 Seconds; Average Rlt Delay
Page 38 of 64 Engineering information Table 16 Release Link Trunk requirements Average speed of answer ≤ 8.00 seconds; average RLT delay ≤ 4.00 seconds Attendant work time (AWT) in seconds circuits 1–5 6–10 11–15 16–20 21–25 26–30 31–35 36–40 41–45 46–50 51–55 56–60 needed Attendant traffic (Ta) in CCS Table 17... - Page 46 Engineering information Page 39 of 64 Table 18 Release Link Trunk requirements Average speed of answer ≤ 10.00 seconds; average RLT delay ≤ 2.00 seconds Attendant work time (AWT) in seconds circuits 1–5 6–10 11–15 16–20 21–25 26–30 31–35 36–40 41–45 46–50 51–55 56–60 needed Attendant traffic (Ta) in CCS Table 19...
- Page 47 Page 40 of 64 Engineering information Table 20 Release Link Trunk requirements Average speed of answer ≤ 10.00 seconds; average RLT delay ≤ 6.00 seconds Attendant work time (AWT) in seconds circuits 1–5 6–10 11–15 16–20 21–25 26–30 31–35 36–40 41–45 46–50 51–55 56–60 needed Attendant traffic (Ta) in CCS 553-2681-100...
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Page 48: Cas Attendant Requirements Average Speed Of Answer ≤ 2.00 Seconds
Engineering information Page 41 of 64 Table 21 CAS attendant requirements Average speed of answer ≤ 2.00 seconds Attendant work time (AWT) in seconds attendants 1–5 6–10 11–15 16–20 21–25 26–30 31–35 36–40 41–45 46–50 51–55 56–60 needed Attendant traffic (Ta) in CCS Centralized Attendant Service Description and engineering... -
Page 49: Cas Attendant Requirements Average Speed Of Answer ≤ 4.00 Seconds
Page 42 of 64 Engineering information Table 22 CAS attendant requirements Average speed of answer ≤ 4.00 seconds Attendant work time (AWT) in seconds attendants 1–5 6–10 11–15 16–20 21–25 26–30 31–35 36–40 41–45 46–50 51–55 56–60 needed Attendant traffic (Ta) in CCS 553-2681-100 Standard 5.00 August 1996... -
Page 50: Cas Attendant Requirements Average Speed Of Answer ≤ 5.00 Seconds
Engineering information Page 43 of 64 Table 23 CAS attendant requirements Average speed of answer ≤ 5.00 seconds Attendant work time (AWT) in seconds attendants 1–5 6–10 11–15 16–20 21–25 26–30 31–35 36–40 41–45 46–50 51–55 56–60 needed Attendant traffic (Ta) in CCS Centralized Attendant Service Description and engineering... -
Page 51: Cas Attendant Requirements Average Speed Of Answer ≤ 6.00 Seconds
Page 44 of 64 Engineering information Table 24 CAS attendant requirements Average speed of answer ≤ 6.00 seconds Attendant work time (AWT) in seconds attendants 1–5 6–10 11–15 16–20 21–25 26–30 31–35 36–40 41–45 46–50 51–55 56–60 needed Attendant traffic (Ta) in CCS 553-2681-100 Standard 5.00 August 1996... -
Page 52: Cas Attendant Requirements Average Speed Of Answer ≤ 8.00 Seconds
Engineering information Page 45 of 64 Table 25 CAS attendant requirements Average speed of answer ≤ 8.00 seconds Attendant work time (AWT) in seconds attendants 1–5 6–10 11–15 16–20 21–25 26–30 31–35 36–40 41–45 46–50 51–55 56–60 needed Attendant traffic (Ta) in CCS Centralized Attendant Service Description and engineering... -
Page 53: Cas Attendant Requirements Average Speed Of Answer ≤ 10.00 Seconds
Page 46 of 64 Engineering information Table 26 CAS attendant requirements Average speed of answer ≤ 10.00 seconds Attendant work time (AWT) in seconds attendants 1–5 6–10 11–15 16–20 21–25 26–30 31–35 36–40 41–45 46–50 51–55 56–60 needed Attendant traffic (Ta) in CCS 553-2681-100 Standard 5.00 August 1996... -
Page 54: Implementation And Operation
Page 47 of 64 Implementation and operation Feature implementation CAS Main To configure CAS Main, respond to the prompts in the following overlays: LD 15 – Change a CAS Main for a customer. Prompt Response Description Change the CAS Main. TYPE Customer Data Block. - Page 55 Page 48 of 64 Implementation and operation Note 1: When the CAS feature is defined, a signal Remote key is assigned automatically to the key above LPK5 on all CAS Main Attendant Consoles. Note 2: For the M1250 and M2250 Attendant Consoles, the C/H key acts as the CAS key.
- Page 56 Implementation and operation Page 49 of 64 NEDC Near-end disconnect control Originating (recommended) Either end FEDC Far-end disconnect control Either end Far end Joint control Originating end (recommended) LD 14 – Add or Change a Release Link Main trunk. Prompt Response Description NEW, CHG...
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Page 57: Cas Remote
Page 50 of 64 Implementation and operation CAS Remote To configure CAS Remote, respond to the prompts in the following overlays: LD 15 – Add or change a CAS Remote for a customer. Prompt Response Description NEW, CHG Add, or change the CAS Main. TYPE Customer Data Block. - Page 58 Implementation and operation Page 51 of 64 LD 11—Add or change a CAS key to multi-line telephones at CAS Remote (if required) Prompt Response Description NEW, CHG Add, or change CAS key assignment. TYPE Telephone type. l s c u Terminal Number.
- Page 59 Page 52 of 64 Implementation and operation ICF 0-(512)-32640 Incoming flash timer. Outgoing end-of-dialing timer for Digitone trunks. 256-(4096)-16128 NEDC Near-end disconnect control. Originating (recommended). Either end. FEDC Far-end disconnect control Either end. Far end. Joint control. Originating end (recommended). LD 14 –...
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Page 60: Operation
Implementation and operation Page 53 of 64 Operation Main operation To answer CAS calls, press the ICI or loop key. To extend calls to a CAS Remote site, follow these steps: Press the signal Remote key. When you hear the special dial tone, dial the Remote DN. Press the RLS key. -
Page 61: Testing
Page 54 of 64 Implementation and operation Testing The tests in Procedure 1, which follows, are conducted when the CAS feature is installed at a Remote site that will be served by a CAS attendant. These procedures can also be used as a guide to locating a fault in the feature. Procedures 2 through describe tests that verify that the CAS attendant can... - Page 62 Implementation and operation Page 55 of 64 From any telephone, dial the DN assigned for the CAS attendant. This call is presented to the local attendant as a normal dial “0” call. If this location is in Night Service, calls dialed to either the local attendant or the CAS attendant are presented to the night number or to Trunk Answer From Any Station (TAFAS) at this location, as applicable.
- Page 63 Page 56 of 64 Implementation and operation Release the call. Momentarily press the RLS key on the local-attendant console (or multi-line). The associated LED goes out, and all calls requiring attendant assistance are presented to the local attendant. Proceed to the CAS Main attendant location, and conduct the tests in Procedure 2.
- Page 64 Implementation and operation Page 57 of 64 Call the attendant at a Remote location by dialing the access code for an outside line, and then the LDN for the Remote location. Ask the attendant at the Remote location to activate the CAS feature by momentarily pressing the CAS key.
- Page 65 Page 58 of 64 Implementation and operation Press the RLS key. A two-way conversation is established between the calling and called parties. Note: If the attendant releases before the telephone answers, the calling party hears a Ringback and is recalled to the attendant after 30 seconds (the slow-answer timer default).
- Page 66 Implementation and operation Page 59 of 64 Dial Silent Hold DN. — The hold confirmation tone is heard. Press the RLS key. Note: The attendant is recalled when the hold timer expires. Procedure 7 Transferring a call to a second Remote telephone Initial condition: A two-way conversation between the attendant and the calling party.
- Page 67 Family Product Manual Contacts Copyright FCC notice Trademarks Document number Product release Document release Date Publish Meridian 1 Centralized Attendant Service Description and engineering © 1979,1996 Northern Telecom All rights reserved 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.