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Northern Telecom DMS-100 Series General Description, Installation And Maintenance

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NORTHERN TELECOM
Printed in Canada
DIGITAL SWITCHING SYSTEMS
DMS-100* FAMILY
INTEGRATED BUSINES
NETWORK SERVICE
BUSINESS SET, GENERAL DESCRIPTION,
INSTALLATION,
Maintenance and Ordering Information
CONTENTS
Reason for Reissue: This revised issue replaces the Standard issue dated
86-05-27. The revisions include the addition of Automatic Call Distribution
(ACD) Sets, incorporation of Appendix 1 (Business Sets and Handsets
equipped with TELADAPT* connectors) and numerous other information
updates and corrections. Due to the substantial changes which require
repagination and renumbering of illustrations, revision marks would not be
helpful and are, therefore, not used in this Practice revision.
* DMS-100 is a trademark of Northern Telecom.
© Northern Telecom 1985
PRACTICE 297-2011-200
Issued: 88 12 08
Standard
REL.NO. 01.02
PAGE
Page i

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Summary of Contents for Northern Telecom DMS-100 Series

  • Page 1 Due to the substantial changes which require repagination and renumbering of illustrations, revision marks would not be helpful and are, therefore, not used in this Practice revision. * DMS-100 is a trademark of Northern Telecom. © Northern Telecom 1985 Page i...
  • Page 2 PRACTICE 297-2011-200 1. OVERVIEW 1.01 The available versions of the Business Set are as follows: NT4X20AA Business Set without Alphanumeric Display - with line cord equipped with Teladapt connectors at both ends and handset cord hardwired to the set. NT4X20AE Business Set without Alphanumeric Display - with line cord equipped with Teladapt connector at the set-end, spade tips at the other end, and handset cord...
  • Page 3 PRACTICE 297-2011-200 Feature Keys, 1.04 The feature keys can be assigned a subset of the following features: Assignable Key De- Acro- signation Feature Description Auto Dial Automatic Dialing Auto Line Automatic Line Call Fwd Call Forward Call Park Call Park PARK Call Wait Call Waiting...
  • Page 4 PRACTICE 297-2011-200 1.09 Volume Control. The speaker volume is controlled by two keys, VOL UP and VOL DOWN. Operating these keys incrementally increases or decreases the speaker volume during an ongoing session. The handset receiver volume is not affected in any way by these speaker volume adjustments. After session has ended, the speaker volume returns to the default value.
  • Page 5 PRACTICE 297-2011-200 • Feature Usage. Note: One feature key must be reserved for accessing the QTD display. Because an LCD indicator is not required for this feature, a feature key without an associated LCD indicator should be chosen for the QTD display function.

  • Page 6: Handsfree Unit

    PRACTICE 297-2011-200 equipped with LCD indicators and are used for features which do not require LCD indication (example: QTD key). This add-on unit attaches to the right side of the business set if only one add-on unit is provided, or to the end of a row of 1 or 2 add-on units (the NT4X20AC is an end-unit which does not allow further addition of any equipment at the right hand side of the unit).
  • Page 7 PRACTICE 297-2011-200 Note 1: On handsfree units designed for bilingual or international use (example: NT4X05AA), keys are designated with icons. Refer to Fig. 1-1. Note 2: The handsfree unit cannot be added to an ACD business set (NT4X20AT). Fig. 1-1 Handsfree Unit Key Designations Page 1-6...

  • Page 8: Installation

    PRACTICE 297-2011-200 2. INSTALLATION INTERCONNECTIONS 2.01 Each Business Set is equipped with a 6-conductor line cord for connection to standard telephone terminal connectors as follows: • NT4X20AA, NT4X20AB, NT4X20AL, NT4X20AM, NT4X20AT sets are equipped with NE-D6QT-87 Teladapt connectors • NT4X20AE and NT4X20AF sets are equipped with NA 800 905 spade tips 2.02 The conductors in the line cords are color coded for termination as given in Table 2-A.
  • Page 9 PRACTICE 297-2011-200 Table 2-A Continued BUSINESS SET CORD CONNECTIONS Note 3: Wire remote (closet) power supply 24 V dc secondary leads from the nearest outlet to the junction box or Teladapt jack serving the unit to be powered. The following restrictions apply: •...
  • Page 10 PRACTICE 297-2011-200 Fig. 2-1 Block Diagram - Business Set without Alphanumeric Display - Interconnections Page 2-3...
  • Page 11 PRACTICE 297-2011-200 Fig. 2-2 Block Diagram - Business Set with Alphanumeric Display - Interconnections Page 2-4...
  • Page 12 PRACTICE 297-2011-200 Fig. 2-3 Block Diagram - ACD Business Set with Alphanumeric Display - Interconnections Page 2-5...
  • Page 13 PRACTICE 297-2011-200 POWER SUPPLY 2.04 Where loop powering is not sufficient, alternate power supplies must ARRANGEMENTS be provided. Alternate power can be obtained through a remote (or closet) dc power unit or through a local plug-in type ac transformer with ac output or dc output.
  • Page 14 PRACTICE 297-2011-200 2.10 The NPS50220-07.L8 single circuit 24 V dc power supply shown earlier under “remote powering” can also be used as a local power supply, in which case the distance and wire gauge requirements listed under “remote (closet) powering” apply. Fig.
  • Page 15 PRACTICE 297-2011-200 Table 2-B Continued ALTERNATE POWER SUPPLY REQUIREMENTS. Set Configuration Alternate Power Required Business Set with Alphanumeric If loop is over 250 Ohm, a 24 V dc local power supply Display or a remote 24 V dc closet power supply is required. ACD Business Set with Alphanumeric A 24 V dc local power supply or a remote 24 V dc closet Display...
  • Page 16 PRACTICE 297-2011-200 Note: 3 When powering for only one add-on unit is required and the loop resistance is 250 Ohm or less, set switch S2 in the business set to LP/HI, and switch S2 in the add-on unit to LP. Do not connect alternate power to the AP+ and VSS leads in that case.
  • Page 17 PRACTICE 297-2011-200 Fig. 2-5 Business Set without Alphanumeric Display, equipped with HFU and One to Page 2-10...
  • Page 18 PRACTICE 297-2011-200 Three Add-On Units: Powering when Loop-Resistance is less than or equal to 250 Ohm Fig. 2-6 Page 2-11...
  • Page 19 PRACTICE 297-2011-200 Fig. 2-7 Business Set without Alphanumeric Display, equipped with HFU and One to Three Add-On Units: Powering when Loop-resistance is greater than 250 Ohm Page 2-12...
  • Page 20 PRACTICE 297-2011-200 Fig. 2-8 Business Set without Alphanumeric Display, equipped with HFU and One Add-On Unit: Alternate Power Connections for all Loop Lengths Business Sets with 2.14 Illustrations: The following schematic illustrations give the various Alphanumeric Display possibilities for powering the business sets with alphanumeric display: Fig.
  • Page 21 PRACTICE 297-2011-200 Note: 6 A separate and isolated power feed is required where loop conditions or configurations dictate an auxiliary feed: (a) for each business set installation (or workstation), (b) for each handsfree unit installed, even if this means a second power supply (see also Note 7).
  • Page 22 PRACTICE 297-2011-200 Fig. 2-9 Business Set with Alphanumeric Display, HFU, and One to Three Add-On Units: Powering when Loop-Resistance is less than or equal to 250 Ohm Page 2-15...
  • Page 23 PRACTICE 297-2011-200 Fig. 2-10 Business Set with Alphanumeric Display, HFU, and One to Three Add-On Units: Powering when Loop-Resistance is greater than 250 Ohm Page 2-16...
  • Page 24 PRACTICE 297-2011-200 Fig. 2-11 Business Set with Alphanumeric Display, HFU, and One Add-On Unit: Alternate Power Connections when Loop-Resistance is less than or equal to 250 Ohm Page 2-17...
  • Page 25 PRACTICE 297-2011-200 Fig. 2-12 Business Set with Alphanumeric Display and one Handsfree Unit: Alternate Power Connections when Loop-Resistance is greater than 250 Ohm Page 2-18...
  • Page 26 PRACTICE 297-2011-200 Fig. 2-13 ACD Business Set with Alphanumeric Display and one to three add-on units: Alternate power connections always required Page 2-19...

  • Page 27: Step Procedure

    PRACTICE 297-2011-200 WIRING AND SWITCH 2.16 The following charts, tables and illustrations give instructions for SETTINGS installing and connecting Business Sets and Add-On Units, including the addition of an Answer Back Module to new or existing equipment. Chart 2-1 INSTALL A BUSINESS SET WARNING: This procedure applies...
  • Page 28 PRACTICE 297-2011-200 Chart 2-1 Continued INSTALL A BUSINESS SET STEP PROCEDURE Note: The following must be observed when installing an ACD Set: Applying power. Either the alternate power supply and loop-power must be applied simultaneously (that means, insert linecord into the ACD Set after the other end of the linecord has been plugged into the connecting box and the power supply), or the loop voltage must be applied first and the alternate power source second (that means plugging the linecord into the connecting box before inserting the plug-in tranformer into the wall-receptacle).
  • Page 29 PRACTICE 297-2011-200 power (LP) or alternate power (AP) supply conditions, the other is used to adjust the set to loop powering the set only (LO), or for loop powering one set and one 20 button add-on unit (HI). • The S3 Switch is used to select the operating mode of the set. In the MAIN set position, the set is a 900 Ohm ac impedance and draws loop current.
  • Page 30 PRACTICE 297-2011-200 2.21 Option Switch Settings: For a listing of internal option switch settings for add-on modules refer to Table 2-D and Fig. 2-16. Table 2-C BUSINESS SET SWITCH SETTINGS SWITCH SETTINGS Business Set without Alphanumeric Display (NT4X20AA, AE, and AL) SWITCH 1 (Address) ADDRESS Zero: Set A0 to OFF...
  • Page 31 PRACTICE 297-2011-200 Table 2-C Continued BUSINESS SET SWITCH SETTINGS SWITCH SETTINGS MAIN-EXT • Set to MAIN if set is loop powered to provide 900 Ohm termination impedance. Set to EXT when set is an ACD set. SWITCH 3 (Test mode) •...
  • Page 32 PRACTICE 297-2011-200 Fig. 2-14 Business Set without Alphanumeric Display (NT4X20AA, AE, and AL): Wiring and Option Switches Page 2-25...
  • Page 33 PRACTICE 297-2011-200 Fig. 2-15 Business Set with Alphanumeric Display (NT4X20AB, AF, and AM): Wiring and Option Switches Page 2-26...
  • Page 34 PRACTICE 297-2011-200 Fig. 2-16 ACD Business Set with Alphanumeric Display (NT4X20AT): Wiring and Option Switches Page 2-27...
  • Page 35 PRACTICE 297-2011-200 Chart 2-2 INSTALL A 20-BUTTON ADD-ON MODULE WARNING: This procedure applies to NT4X20AC and NT4X20AG add-on modules. The NT4X20AC unit is no longer manufactured and is rated A&M (additions and modifications only). STEP PROCEDURE Perform one of the following: (a) If the first add-on is being installed, remove the cover and faceplate from the Business Set, or (b) if a second or third add-on is being installed, remove the cover from the preceding add-on.
  • Page 36 PRACTICE 297-2011-200 Table 2-D 20-BUTTON ADD-ON MODULE SWITCH SETTINGS KEY NUMBERS CONTROLLED BY SWITCH SETTING SWITCH SETTINGS SWITCH 1 (Address) First Add-on Unit: A0 To ON A1 To OFF A2 To OFF 10 - 29 Second Add-on Unit: A0 To OFF A1 To ON A2 To OFF 30 - 49...
  • Page 37 PRACTICE 297-2011-200 Fig. 2-17 20-Key/16-LCD Indicator Add-on Unit - Connector and Option Switches Page 2-30...
  • Page 38 PRACTICE 297-2011-200 Chart 2-3 INSTALL AN NT1L00AA OR NT1L05AA HANDSFREE UNIT STEP PROCEDURE Remove the faceplate from the Business Set by inserting an NS-16750L3 releaser or equivalent in the hole located in the front of the set. Remove the two screws holding the cover and remove the cover from the set. Remove the filler plate from the left side of Business Set.
  • Page 39 PRACTICE 297-2011-200 Chart 2-3 Continued INSTALL AN NT1L00AA OR NT1L05AA HANDSFREE UNIT STEP PROCEDURE Hookswitch Lead Color Codes Connectors on Circuit Board Slate/White (S/W) Slate (S) Slate/Blue (S/BL) Slate/Brown (S/BR) MIC- Green (G) VSS(1) (Note) Slate/Yellow (S/Y) MIC-HS Slate/Green (S/G) Replace the cover and faceplate on the set.
  • Page 40 PRACTICE 297-2011-200 Fig. 2-18 Handsfree Unit (HFU) Circuit Board and Wiring Page 2-33...
  • Page 41 PRACTICE 297-2011-200 Chart 2-4 INSTALL AN NT4X20AJ AUTO ANSWERBACK KIT Caution: 1 Do not connect power to equipment until after the NT4X21AD unit is installed. Where a unit is added to existing (already in service) equipment, power supplies to such equipment must be removed prior to opening of sets to avoid damage to equipment and/or shock hazards.
  • Page 42 PRACTICE 297-2011-200 Table 2-E CONNECT THE AUTO ANSWERBACK MODULE AUTO ANSWERBACK CONNECT TO MODULE LEADS BUSINESS SET HANDSFREE UNIT DBUS W-BL DSTR DCLK Y-BL VBB1 R-BL + 12V BK-W Page 2-35...
  • Page 43 PRACTICE 297-2011-200 Fig. 2-19 Auto Answerback (AAB) Module - Installation and Wiring Page 2-36...
  • Page 44 PRACTICE 297-2011-200 INSTALLING THE ACD 2.22 The ACD business set NT4X20AT is provided as a factory assembled unit. Modification of regular NT4X20 business sets for ACD service should not be attempted in the field, as various items are needed which are not normally shipped as separate details, and some tools required may not be available to the installer.
  • Page 45 PRACTICE 297-2011-200 Fig. 2-20 ACD Business Set with Alphanumeric Display (NT4X20AT) - Cicuit Board Assembly and Wiring (always Factory assembled and wired) Page 2-38...

  • Page 46: Polarity Check

    PRACTICE 297-2011-200 3. VERIFICATION PROCEDURES LOOP CHECK 3.01 Loop and linecard tests must be performed at the Central Office (ref. 297-2011-180). It is assumed that loops and linecards have been checked out prior to the installation of any business sets. 3.02 Verify that the loop resistance is less than or equal to 1230 Ohm, and that the dB loss is less than or equal to 24 dB at 8 kHz.
  • Page 47 PRACTICE 297-2011-200 accordance with Chart 3-1. Note: The system will not attempt to restore any LCD to its pre-test state. The LCDs will be OFF at the end of the test, with features in the same state as before the test. A background audit restores all feature indicators at its next occurrence (audit intervals are switch and load related).
  • Page 48 PRACTICE 297-2011-200 Chart 3-1 Continued STATION RINGER TEST - KEY SEQUENCES Key G69: LCDs associated with keys G61 and G67 turn ON. Note 4: The only messages which are not tested are “Turn On/Off Handsfree Control” and “Open/Close Echo Mode” which are not used by call processing. Note 5: In this Chart, the term “All LCDs”...
  • Page 49 PRACTICE 297-2011-200 Chart 3-1 Continued STATION RINGER TEST - KEY SEQUENCES Vol Down key (DW) Dial tone volume decreases 1234567890*# Handset off-hook Dial tone switches to handset and all LCDs 1234567890*# flash Handset on-hook Dial tone switches to speaker and all LCDs 1234567890*# wink HLD key...
  • Page 50 PRACTICE 297-2011-200 Fig. 3-1 NT4X20-Type Business Set - Key and LCD-Indicator Layout Page 3-5...
  • Page 51 PRACTICE 297-2011-200 DISPLAY SCREEN 3.07 If the LCD Screen is to be tested for proper character-input responses TEST (refer to Table 3-A), the “LTS” switch (S3) on the NT4X20AB, AF, AM, and AT business set circuit boards has to be reset. The S3 switch has two toggles. When looking at the circuit board as illustrated in Fig.
  • Page 52 PRACTICE 297-2011-200 Table 3-A Continued DIAL PAD CHARACTER ENTRIES DIAL PAD KEY OPERATED CHARACTERS IN SEQUENCE OF APPEARANCE 8 T U V 9 W X Y * + - / 0 _ Q Z # $ % @ Note: Entries may be edited by positioning the cursor at the desired location and overstriking the displayed character, using the appropriate dial pad key.

  • Page 53: Maintenance

    PRACTICE 297-2011-200 4. MAINTENANCE 4.01 Maintenance of the Business Set and the associated add-on units is restricted to replacement of the set, the defective modules, and field replaceable items as required. Refer to Part 5 for ordering information. Page 4-1...
  • Page 54 PRACTICE 297-2011-200 Page 4-2...
  • Page 55 PRACTICE 297-2011-200 5. ORDERING INFORMATION 5.01 Order Business Sets and associated apparatus by quoting part numbers as given in Table 5-A. 5.02 Order field replaceable items for individual sets and/or units by quoting part numbers as given in Table 5-B. Table 5-A ORDERING INFORMATION - BUSINESS SETS AND ADD-ON UNITS DESCRIPTION...
  • Page 56 PRACTICE 297-2011-200 Table 5-A Continued ORDERING INFORMATION - BUSINESS SETS AND ADD-ON UNITS DESCRIPTION ORDERING CODE ENGINEERING CODE Handsfree Unit, English (includes HFU power A0299732 NT1L00AA supply) Handsfree Unit, bilingual, English/French (includes A0320215 NT1L05AA HFU power supply) Add-On Unit Power Supply (Ault) A0352921 NPS50220-07 List 8 Note: For additions and maintenance (A&M) purposes only.

  • Page 57: Ordering Code

    PRACTICE 297-2011-200 Table 5-B ORDERING INFORMATION - FIELD REPLACEABLE ITEMS DESCRIPTION ORDERING CODE ENGINEERING CODE For NT4X20-Type Business Sets: User Guide (English) for NT4X20AA,AE,AL,AT P0649745 P0649745 User Guide (French) for NT4X20AA,AE, P0649746 P0649746 User Guide (English) for NT4X20AB,AF,AM,AT P0660566 P0660566 User Guide (French) for NT4X20AB,AF, P0660567 P0660567...
  • Page 58 PRACTICE 297-2011-200 Table 5-B Continued ORDERING INFORMATION - FIELD REPLACEABLE ITEMS DESCRIPTION ORDERING CODE ENGINEERING CODE Faceplate, black, for NT4X20AG (or -AC, rated P0664141 P0664141 A&M) Add-on Unit Designation Tabs, English P0586393, and P0586393, and P0596156 P0596156 Designation Tabs, French P0586394 P0586394 Plastic key cap, clear...