Mitel SX-2000 Light Configuration guide

GENERAL INFORMATION GUIDE
LIGHTWARE 34, Release 1.0

NOTICE
The information contained in this document is believed to be accurate in all respects but is
not warranted by Mitel Networks™ Corporation (MITEL®). The information is subject to
change without notice and should not be construed in any way as a commitment by Mitel
or any of its affiliates or subsidiaries. Mitel and its affiliates and subsidiaries assume no
responsibility for any errors or omissions in this document. Revisions of this document or
new editions of it may be issued to incorporate such changes.
No part of this document can be reproduced or transmitted in any form or by any means -
electronic or mechanical - for any purpose without written permission from Mitel Networks
Corporation.
Mitel, SX-2000, SX-200, MiTAI, MiLINK, HOST COMMAND INTERFACE (HCI), TALK TO,
ANSWER PLUS, Speak@Ease, LIGHTWARE, NuPoint Messenger, XpressOffice,
SUPERSET, SUPERCONSOLE 1000 and SUPERCONSOLE 2000 are trademarks of
Mitel Networks Corporation.
Windows and Microsoft are trademarks of Microsoft Corporation.
INTEL and Pentium are trademarks of Intel Corporation.
Java is a trademark of Sun Microsystems Incorporated.
Netscape and Netscape Navigator are trademarks of Netscape Communications Corpora-
tion.
Other product names mentioned in this document may be trademarks of their respective
companies and are hereby acknowledged.
SX-2000 General Information Guide
LIGHTWARE 34, Release 1.0
July 2005

Table of Contents
3
Product Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
System Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Call Progression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Lines and Trunks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Trunks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Supporting Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Application Services Unit (ApSU®) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
SX-2000 LIGHT CTI Connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
R2 Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Enterprise Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
OPS Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
7100 Management Access Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
SX-2000 Alarm Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Mitel 6100 Contact Center Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
NuPoint Messenger™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Emergency Response Adviser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Control Cabinets - Redundant SX-2000 LIGHT System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Peripheral Cabinets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
SUPERSET HUB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
System Fail Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Peripheral Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Line Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Trunk Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Migration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Migration of SX-2000 to 3300 ICP (3300 ICP takes control) . . . . . . . . . . . . . . . . . . . . . . . .28
Migration of SX-2000 to 3300 ICP (SX-2000 retains control) . . . . . . . . . . . . . . . . . . . . . . . .29
Digital Service Unit (DSU) Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Network Services Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Universal Network Services Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
R2 Network Services Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
BRI Network Services Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
SUPERSET 4000 Series Telephones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
SUPERSET 4001 Telephone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
SUPERSET 4015 Telephone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
SUPERSET 4025 Telephone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
SUPERSET 4125 Telephone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
SUPERSET 4150 Telephone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
SUPERSET 400 Series Telephones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
SUPERSET 410 Telephone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
SUPERSET Interface Module 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
Programmable Key Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
Programmable Key Module 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

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Programmable Key Module 48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Digital Line Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Single-line Digital Line Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Attendant Consoles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
SUPERCONSOLE 1000 Attendant Console . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
SUPERCONSOLE 2000 Attendant Console . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
Console DSS/BLF Interface Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Datasets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
DATASET 2103 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
DATASET 2203 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
DNIC Music On Hold/Pager Unit (DMP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Standard Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Optional Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Toll Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
Authorized Maintenance Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
Enhanced Login Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
Mitel Options Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
Maintenance and Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
Printer Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
Circuit Card Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
Network Services Unit (NSU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
Peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
Dimensions and Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
SUPERCONSOLE 2000 Reserve Power Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85
Traffic and Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
Attendant Console Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
Tone Plan Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87
Capacity Levels, Software Configurations, and Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . 88
MITEL Feature Resource Dimensions (MFRDs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88
Hardware Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89

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Feature Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90
Other Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92
Supported MFRDs (no longer sold) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93
MSDN/DPNSS Network Resource Dimensions (MNRDs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97
MITEL Traffic Capacity Levels (MTCLs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .98
Application Capacity Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99
MHCL: MITEL HCI Capacity Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99
MTSP: MITEL TAPI Service Provider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99
MACL: MITEL ACD Agent Capacity Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99
MAIACL: MITEL Agent ID Appearance Capacity Level . . . . . . . . . . . . . . . . . . . . . . . . . . .100
MLCL: MITEL Maximum Line Appearances Capacity Level . . . . . . . . . . . . . . . . . . . . . . .100
MITEL Software Applications (Optional Features) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101
MITEL Software Bundles (MSBs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .104
MITEL Core Packages (MCPs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .104

SX-2000 General Information Guide
6

Product Overview
7
Product Overview
The Mitel SX-2000 LIGHT system is an advanced, fiber-distributed telephone system that is
designed for larger organizations or for networked telecommunications environments. The
distributed architecture separates the control node from peripheral, application, and network
access nodes and links them by multimode fiber optic cable. The system can be configured to
meet the communication needs and physical layout of virtually any enterprise -- whether a
single office, a campus, or multiple sites spread across a wider geographic area. The Mitel
SX-2000 LIGHT system supports up to 3000 telephones in a single system configuration.
However, if the number of users exceeds the 3000-user capacity of a single system, a virtually
unlimited number of systems can be "clustered" to provide a seamless network by using digital
trunking and SX-2000 private network applications.
To provide high reliability, the SX-2000 LIGHT is configured as a multi-cabinet, control
redundant system. The redundant main control cabinet provides full back-up, including
independent power supplies, so that system operation will not be affected if a main control
component fails. When the system switches to the alternate main control, calls in progress are
not dropped and callers are unaware of the system event. The redundant main control cabinet
can support up to eleven expanded peripheral nodes, page 21, located up to 8.7 miles (14
kilometers) away. The redundant main control cabinet also supports up to five DSU cabinets
(see page 30) or Network Services Units (see page 31).
System Architecture
The SX-2000 LIGHT system has two levels of control: main control and peripheral control; the
functionsarehandledbythemaincontrollerandperipheralswitchcontrollercards,respectively.
The main control communicates with the peripheral switch and DSUs by using the
serial-communication message links and circuit switch links. The main control sets up all calls
and establishes the paths through the circuit switch. The main control includes the following
functional subsystems:
•MessageSystem:Themessagesystemlinksthemaincontroltotheintelligentsubsystems
and handles all protocol control (including handshake, message processing, error check,
reformat, redirection, queueing, and maintenance functions). The messages include
off-hook,digits,andothersignalinginformationcollectedbytheperipheralswitch controller.
•Circuit Switch: Based on messages received from the main control, the switching matrix
establishes paths between parties or between digital processing equipment. The system
circuit links are a shared resource and are allocated to calls as required. The digital signals
are typically PCM voice and various control traffic signals.
•Mass Storage Subsystem: By using the hard disk module, the mass storage subsystem
provides long-term non-volatile bulk memory storage of system information (including sys-
tem software, database backup, and logs).Operating system, database upgrades, and an
additional level of backup are provided through a removeable storage device drive.
The peripheral control substantially reduces the computing load on the main controller by
performing all the simple but real-time-intensive tasks that are associated with scanning and

SX-2000 General Information Guide
8
controlling a large number of different Peripheral Interface cards. Following instructions from
themaincontroller,itsetsupconnectionsbetweenthePeripheralInterfacecardsandthecircuit
switch subsystem.
Basic System Architecture
Call Progression
Each telephone connects to the system through an interface circuit on a Peripheral Interface
card. During a simple call, the call progresses as follows:
• Whenatelephonegoesoff-hook,themaincontrollerconnectsthetelephone’sreceivepath
to a circuit carrying dial tone and the transmit path to a DTMF receiver circuit.
• As the user dials numbers (DTMF tones) on the telephone keypad, the DTMF receiver
translates the tones into digits and passes them over message links to main control.
• Themaincontrolcollectsthedigitsandidentifiesthedestination;then,itringsthedestination
by sending a control signal over a message link.
• The peripheral switch controller sends a message to main control when the destination set
answers the call.
• The main control establishes a circuit switch voice path by connecting the source to the
destination.

Product Overview
9
• The system’s tone generator supplies all audible tones (such as dial tone, busy tone, and
ringback tone) to the circuit switch for distribution to callers as required.
• AtthePeripheralInterfacecard,voicesignalsfromeachtelephoneareconvertedintodigital
form (pulse code modulation) and routed through the system on the established circuit;
signals leaving the switch are decoded back into analog form by the Peripheral Interface
card.
Lines and Trunks
Lines
The system supports the following types of internal voice lines:
•Digital Network Interface (DNI) Lines provide an interface for Mitel digital telephones,
consoles, and datasets. The maximum loop resistance on a DNI line must be 280 ohms or
less, and the loop length must be 3300 ft. (1000 m) or less on 26-gauge wire.
• These lines are supported by the Digital Network Interface line card.
•On-Premise (ONS) Lines (24 V per port) are for industry-standard rotary dial and DTMF
telephones. The external loop resistance on an ONS line must be 600 ohms or less, and
the loop length must be 5000 ft. (1500 m) or less on 26-gauge wire.
• These lines are supported by the ONS line card and the ONS CLASS/CLIP line card.
•Off-Premise (OPS) Lines (48 V per port) are for industry-standard telephones where the
externalloopresistanceexceeds600ohmsorwherelightningsurgeprotectionis required.
The maximum loop resistance on an OPS line must be 1800 ohms or less, and the loop
length must be 19,000 ft. (5800 m) or less on 26-gauge wire.
• These lines are supported by the OPS line card.
•Control Over Voice (COV) Lines provide an interface for voice mail systems. The maxi-
mum loop resistance on a COV line must be 280 ohms or less, and the loop length must
be 3300 ft. (1000 meters) or less on 26-gauge wire.
Trunks
The system can connect to the public switched network or to private networks over both digital
and analog trunks.
The following digital links are supported:
•DS1 Links: The system supports CO, DID, E&M, MSDN/DPNSS, and MSAN/APNSS
protocols.
• The SX-2000 LIGHT system connects to DS1 links by using a DS1 Formatter or DS1/T1
Formatter II card.
•CEPT Links: The system supports MSDN/DPNSS, DASS II (UK only), and Italian CAS
(Italy only) protocols.

SX-2000 General Information Guide
10
• The SX-2000 LIGHT system connects to CEPT links by using a CEPT Formatter or CEPT
Formatter II card.
•BRILinks:ThesystemsupportsEuro-ISDN2B+D,BasicRate,orNorthAmericanNational
ISDN-1 and ISDN-2 protocols.
The SX-2000 LIGHT system connects to BRI links by using either a BRI card or BRI NSU,
page34.TheBRIlinkcanbeeitherUserorNetworkTermination(forEuropeaninstallations
only).
•PRILinks:ThesystemsupportsDMS-100,DMS-250,BellcoreNationalISDN,4ESS,NI-2,
5ESS NI-2, QSIG and Euro-ISDN (CTR4) protocols.
The SX-2000 LIGHT system connects to PRI links by using a PRI card or Universal NSU,
page 31.
•R2 Links: The system supports the CCITT Blue Book, Volume VI, Fascicle VI.4, Specifi-
cations of Signaling System R2, Recommendations Q.440 to Q.490 (with the exception of
Echo Suppression (Q.479), Test Calls (Q.490) and international signals).
The SX-2000 LIGHT system connects to the R2 links by using either an R2 card or R2
NSU, page 33.
• The following analog trunks are supported:
•Analog CO Trunks interface to the system through the Loop Start/Ground Start (LS/GS)
trunk card.
•E&M Trunks interface to the system through the E&M trunk card (which canbe configured
for either 2-wire or 4-wire operation). This card supports Type I through Type V circuits.
•Direct Inward Dial and Tie Trunks interface to the system through the DID/Loop Tie trunk
card, AC15 trunk card, DID/2 trunk card, or DID/3 trunk card (depending on local
requirements).