Inter-Tel Imx/Gmx 256 Installation And Field Maintenance Manual

							INTER-TELPRACTICESIMX/GMX 256 INSTALLATION & MAINTENANCEOVERVIEWIssue 1, November 1994
NO’I‘E: According to FCC regulations, if a customer
wishes to change from an existing RF-rated system to an
MF-rated system (or vice versa), the installing company
must advise the customer “to notify the telephone 
corn-
party of the change if they want the [ICF or MF] rate and
that they may have to certify in writing to the telephone
company that the equipment is configured as a key sys-
tem and pay appropriate service order charges.”4. 
HfmDwAREsuMMARY
4.1’The SPEClFICATIONS section of this manual ex-
plains environmental requirements of the system, de-scribes the hardware, and gives pre-installation
information. The hardware descriptions include: equip
ment cabinet, power supply, circuit cards, station instru-ments, and additional equipment needed for the
optional features.
5.
5.1
INSTALLATION, PROGRAMMING,
AND MAINTENANCE SUMMARY
The modular design and self-diagnostic capabili-ties of the system facilitate installation and repair with
minimal down-time. Strict quality control standards formanufacturing and thorough field testing provide the
system with the reliability demanded by today’s 
high-
technology market.5.2 The 
IN~~ON section contains instruc-
tions for assembling the main distribution frame (MI@)
and for installing the equipment cabinet, power supply,circuit cards, station instruments, and other optional
hardware.53 
ThePRGGRWMINGsection describes the pro-
cedures for programming the system features. After the
system is installed, the flexible software allows the data-
base to be 
customized to meet the customer’s needs. An
external, customer-provided, IBM AT-compatible per-
sonal computer (PC) is used to perform this task.5.4 The 
TROUBLESHGGTING section gives
instructions for correcting system problems and replac-
ing defective parts. Part numbers and a recommendedinventory of spare parts are listed in the 
REPIACE-
MENT PARTS section.
Page 1-3 
						

							OVERVIEW
Issue 1, November 1994INTER-TELPRACTICESIMX/GMX 256 INSTALLATION & MAINTENANCE
6. FEATURESSUMMARY
6.1System, keyset, single-line set, DSS/BLF Unit,
Attendant Computer Console, and attendant features arelisted on the following pages. 
Those future murkzdwith an asterisk 
(*) mquire aa2iitional eqwpment. For
complete descriptions and operating instructions, refer
to the 
SPECIFICAI’IONS and m sections of
this manual.
k SYSTEMFEATURESHardware add General System 
Featulres
Five available software packages
Flexible station instrument 
con&uration and num-bering plan
mo DB9 connectors on the ROM Central Process-ing Unit 
(RCPU) Card for connecting optional
SMDR/SMDA output devices or an external (IBM
AT-compatible) PC for programming
Easily accessible system voltage test points on the
front edge of the RCPU Card
Database battery back-up with voltage test points
Adjustable baud rates for on-site programming andthe optional 
SMDR/SMDA output devices (110,
300,600,1200,2400,4800,9600, and 19200 baud)
Computer modem with software auto-baud on the
RCPU Card for remote programming (300 and 1200
baud)
Variable system timersIndustry-standard message waiting capability on
SLCs (using -1OWDC derived from a combination
of system voltages)l * Optional Station Message
Detail Recording
(SMDR) and/or Station Message Detail Accounting
(SMDA) output device(s)
l *One relay on the RCPU Card is dedicated as a power
failure transfer relay; the other relay is a general pur-
pose relay that can be used for night transfer, general
signaling devices, etc.
a* Optional Attendant Computer Consoles (personal
computers equipped with headsets; allow the user to
view system activity on the monitor and to process
calls and messages using the keyboard)
l * Two optional external music sources
l * Optionaloff-premises
extensions (OPXs) with vari-
able ring cadence
l * Optional OPX repeaters
l * Optional multi-port voice mail system
l * Optional talkback speaker equipment
l * Optional facsimile machinel* 
*Optronal doorbox
l * Optional battery back-up
l * Optionalextema1 paging equipment
l * Optional playback devices for use with the auto-
mated attendant and hunt group featuresSystem Organization and Record Keeping
Featpresl
Ten paging zones and nine external paging ports
l * Station Message Detail Recording (SMDR)l * Station Message Detail Accounting (SMDA) 
-
available only in the Exfer&d and Ex&naMplus Tl
and 
E&M software packages
l * Programmable reports for toll restriction, Least-
& Routing &CR), and station data
Call cost accounting (estimated)Forced, forced LCR toll, standard, optional, and
class-of-service account codes (forced account
codes can be validated or non-validated)I
Flexible attendant arrangements
Tenant groups and departments
l * Hunt groups with individually-programmed timers
(may have optional overflow and announcement sta-
tions with playback devices)l
System alarm display and reportingl Voice computer hunt groups with optional 
IYIMF
feedback tonesI
lhmkFeaturesl
l
Auto trunks and trunk groups (restricted to accessing
a single trunk on KF-rated systems)
Automatic incoming trunk answeringDual-tone multi-frequency 
(MMF) or dial-pulse
signaling
Loop start and/or ground start compatibilityHybrid balancing (ideal, loaded, or unloaded) for
optimal CO trunk performance
CO trunk receive and transmit adjustments for opti-
mal voice volume levels
Relaxed ring detection (ground start trunks on 
LGCs
OdY)Outgoing-access, allowed-answer, and ring-in
assignments on a station-by-station basis (day lists
and night lists)
Day and night modes of operation (by tenant group)
Day and night toll restriction on a station-by-station
basis (including provisions for eight area/office codePage 14 
						

							INTER-TELPBACTICESIMX/GMX 256 INt3lXLLATION & MAINTENANCEOVERVIEWIssue 1, November 1994
0
0
0
I
0
restriction user groups and PBX, absorbed-digit, and
equal access dialing)
Least-Cost Routing 
(LCR) (may be programmed ona station-by-station basis to be transparent to the
=4-not available in the KF-rated, Exhznakdplus
Tl and E&M software package
System-wide Call Privacy Release optionTrunk reseize capability on a station-by-station
basisDirect Inward System Access 
@ISA) - in the
Extended and Extendedplus Tl and E&U software
packages, DISA lines can have toll restriction class
of service similar to station toll restrictionsl * Automated attendant 
- available only in the
Exmuiki and ExtUplus Tl and E&Msdware
packages
.. I
0
Basic Tl trunk emulation
Basic E&M networking (tie trunks)
Direct inward dialing (DID) trunks
Flexible DID ring-in assignments
Programmable wink, immediate, or delay start op-
tions for DID and 
EgLM trunks
Toll Security with weekly limits for 
7- and Xl-digit
and/or operator-assisted and international calls -
available only in the Extended and Exzendedplus TI
and E&M software packagesGeneral Station Features
0
0
0
0
0
I.
0
I.
0
Programmable feature codes for easy station opera-tion
Call privacy/privacy release
Station-to-station intercom calls
Off-Hook Voice Announce (OHVA) calls (the abil-
ity to place or receive OHVA calls depends on the
type of station instrument used, and may be enabled/
disabled on a station-by-station basis)
Inter-station messages and message cancel
Station exchange
Ring intercom always
Private intercom call overrideAutomatic camp on to busy stations, trunks, and
LCR (ability to camp on to LCR may be disabled on
a station-by-station basis)
Busy trunk/station callback (queue)Individual hold
Call splitting
Hold recall
a
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
B.
0
0Call waiting
Call transfer to outside telephone numbers and ex-
tension numbers
Transfer to hold
Transfer recall
Reverse transfer and group call pick-up
conference calls-capacity ranges from 10 simul-
taneous three-party conferences to four simulta-
neous &party conferences
System forwarding (routes calls based on the type of
call and the status of the intended station)
Call forward to extension numbers and hunt group
pilot numbers
Call forward to outside telephone numbersSystem speed dialing (including non-display and
tenant-specific numbers) - can be programmed to
override station class of service
Station speed dialing
Redial (last number dialed or, at 
keysets only, last
number saved)
Do-not-disturb with customized messages (the abil-ity to place a station in do-notdisturb may be en-
abled/disabled on a station-by-station basis)
Cancel miscellaneous operations
Hookflash (over all types of trunks)
Hunt group remove/replace
House phone
Silent messaging (leaves a message at 
a stationwith-
out placing an actual call)
KEYSET FEATURES
Various digital and analog keyset models are avail-1
able (for a complete listing of all the keyset models
available and the optional equipment that may be in-stalled on them, refer to pages 2-21 and 2-25 in
SPEClPICAl-IONS)Digital 
keysets, AIM keysets, and Inter-Tel/DVK 1
keysets allow the users to individually control voice
and tone volume levels for intercom calls, outside
calls, background music, etc.
l * Liquid crystal display (LCD) (optional on somemodels) for viewing: numbers dialed; speeddial
numbers; inter-station, do-notdisturb, and remindermessages; date/time; 
keyset identification; station
programming; etc.
l *Optional Data Port Module on IMX 12-/2Q-line key-sets and 
Inter-Tel/DVK keysets for installing a
modem-equipped data device (for simultaneous 
						

							OVERVIEWINTER-TELPRACTICESIssue 1, November 1994IMX/GMX 256 INSTALLATION & MAINTENANCE
voice/data communication), or for installing a loud
ringing adapter 
(LRA) and signaling device(s)l * Optional Personal Computer Data Port Module
(PCDPM) on digital keysets for off-hook voice an-nounce receive capability and to allow a digital
DSS/BLF Unit and/or an optional Modem Data PortModule to 
bc installed
l * Optional Modem Data Port Module 
(MDPMJ on
digital keysets for installing a modem+z&peddatadevice (for simultaneous voice/data communica-
tion) or a single-line set -requires a PCDPM
12-key pushbutton keypad
“Hot” keypad-allows dialing of feature codes, ex-
tension numbers, and trunk access codes without
pressing the SPCL key or lifting the handset
Up to 20 key maps for determining the exact layout
and function of the keysFeature keys for one-key access to feature codes
(some of the keys may be designated as user pro-
grammable)
0
I
0
0
0l
0
0
0
0
0
0
0
0
0
0
0
0
ICKO speed-dial (SD) keys with light-emitting
diode (LED) indicators
Call appearance keys with LED indicators (for in-
coming call indication/access)Secondary call keys with LED indicators (show
ring-in indications for the designated ‘Primary” sta-tion)
Individual trunk keys with LED indicators (for in-
coming and outgoing call indication/access)
Trunk group keys with LED indicators (for outgoing
call access and trunk group status)
Integrated speakerphone (allows handsfree opera-
tion on outside calls and intercom calls)
Speakerphone on/off
Slide-out directory card
Ring and voice volume controls
User-programmable ring tone
Self-test 
function
Hearing aid-compatible 
(I-WC) handsetReversible baseplate and cradle hook for wall
mounting
l * Optional headset
l * Optional handset amplifier
l * Background music (two sources)
l Microphone mute
l Handsfree answer enable/disablel On-hook dialing/monitoring
System holdStation call monitoring (hunt group supervisors
OdY)
Call barge (break through to a busy station)
Do-not-disturb override (the ability to override 
do-
not-disturb may be enabled/disabled on a 
station-by-
station basis)
Activity release feature (primarily intended for use
with the Attendant Computer Console; entering this
feature code terminates any current activity and re-
turns the station to idle or dial tone)
Page remove/replace
Intercom (extension number) and outside (systemspeeddial number) directories 
- available only in
the Extended and ExendedpruS Tl and E&M soft-
ware packages
Automatic intercom and/or outside call access
C.ENHANCED SINGLE-LINE SET @SL!3)
FEATURES
12-key pushbutton keypad
User-programmable feature keys for one-key access
to feature codes
Timed hookflash (FLASH) key
Neon lamp for message waiting indication
Ring volume control
Selectable ring tone (HI or LO)
Hearing aid-compatible 
(HAC) handsetReversible baseplate and cradle hook for wall
mounting
Selectable AC/DC ringer
l * Optional handset amplifier
D.SINGLELINE INSTRUMENT (SLI)FEATURES
0 l%-key pushbutton keypad
l
User-programmable feature keys for one-key access
to feature 
codesl
Timed hookflash (FLASH) key
0 Ring volume control
l
Hearing aid-compatible (HAC) handset
0Reversible baseplate for wall mounting
0 Selectable AC/DC ringer
l
Optional message waiting indication tones
l * Optional handset amplifierPage l-6 
						

							INTER-TETJPRACTIC~IMX/GMX 256 INSTALLATION & MAINTENANCE
OVERVIEWIssue 1, November 1994E.
DIRECT STATION SEZECTION/FWSY
LAMP FIELD @SS/B~ UNlT FEATURES
1l * Up to 50 keyset circuits may have units installed
0
0
F.
0
0
0
0
0
0
0
Each unit has 60 keys with LED indicators for one-
key access to up to 60 extension numbers (the 
LEDs
show the status of the assigned stations 
and/or hunt
groups)
Up to eight key maps for determining the layout and
numbers accessed by the keys
A’lTENDA.NT COMPUTER CONSOLE
FEnwtEs
IBM XT-, AT-, or 3Wcompatible computer
CGA, EGA, or VGA monitor and Monitor Interface
Card
122-key custom keyboardHeadset operation
Visual display of system call activity, system direc-
tory, system alarms, date and time, etc.Automatic call priority
Quick, simple call answering and transferNOTE: For additional information on the Attendant
Computer Console, along with detailed installation and
programmiq~ instructions, refer to the manual included
with the console.G. 
AlTENDANTF’EATURE!3
0
0
0
0
0
0
0
0
0
0
0
0
System speed-dial number/name programming
Remote canceling of do-not-disturb and call forward
for stations served
System alarm reporting/clearing
Enable/disable system night mode
Set date and time of day
Attendant recall
System do-not-disturb and reminder message 
pro-
EFamminPStation feature programming (user name, tenant
group, department, and attendant)
Immediate off-hook voice announce 
(OHVA) calls(requires special programming and an Attendant
Computer Console or a DSS/BLF Unit)
Enable/disable background music to external pag-
ing speaker(s)
Trunk maintenance feature for taking trunks out of
service and placing them back in again
SMDAreport can be generated at any time by enter-
ing a feature 
codePage l-7 
						

							OVERVIEW
Issue 1, November 1994INTER-TELPRACTICESIMX/GMX 256 lNSTALLATION % MAINTENANCEH. 
MAXIMUMCAPAClTlE!36.2
Some of the features have maximum capacitiesthat are dependent on the availability of system chan-
nels and/or circuits. The features with such capacities
are listed in the following table.
FEATURE1 CAPACllY
Voon-blocking voice chaanels/poxts
Paging zones
Extexnal paging pelts
Conference dmuits available
Parties per conference
Simultaneous conferences
System speed dialing
Numbers per systemDigits per number
Station speed dialingNumbers per 
keyset - CO
Numbers per 
keyset - IC
Numbers per single-line set
- CO and/or ICDigits per entry - CODigits per entry - IC
Redial numbers per station
Digits per number
LCR
Route groups
Facility 
groupsTrunk groups per facility groupDial rules (16 digits each)
- total- programmableFacility group callback requests per
system
Camp on requests per system
Callback (queue) requests per station
Camp on by a stationStations camped on 
to a station
Ptatlons camped on to a tnmk group
hter-station messages per system
Programmable reminder messages
Message requesk per system
Do-not-disturb messages
Messages par system
Ring-in/allowed-answer patterns
System forwarding paths
Paths per stationPoints per path
220
10
932
8
1W400
32
10
10
10
16
4h
1
48
19
2447
32
29
50
so
1
1
255
240286
20
12020
26640
200
34
FEATURECAPAClTY
Toll action user groups8
Extended 
area codes par group4
Allowed long distance numbem20
Digits per number10
Alteraate canier numbers20
Digits per number10
Account codes
Forced256
Standard128clsss-of-selvice256
Digits per code8SMDA account codes2s
Attendants256
Attendant Computer Consoles
128
DSS/RL.F-equipped circuitsRxtension numbers per DSS/RLF UnitB 5060
Hunt 
groups
Per system
Stations per hunt group
Announcement stations per hunt
groupOverflow stations per groupoverflow counts
Tenant groups
Departments per tenant group
Tlhlnks
Auto tnmksCO/E&M trunk groupsTrunks per group
DID trunk groups
Trunks per group
DID entries
Entries per DID group
Map pup assignments
KeysetDSWRLF
Secondarg call key stations per prhuystation
Secondary tail keys per station
iis
31o-127c
8
10
18447
184
11
184
:z20
8
10
16
b Ifuaingthrewiigitextenaion num~anexte.naionn~canbepr~edwithaponnd(#)tospeeddialprivateintercomcallstothestation. Or, a “4” (the default feature coda for ravaraa transfer) maybe entered before a station extension rumba or hunt group pilotnumber to qaickly reverse tramfar (pii up) calla Lam that station
or hunt group.
= Plualovcrflow
* Asmanyasdesireduntilatotalof480forallhuntgroupsisreached
c orunlimited
f AsmanyPSdcSireduntilatotalof400forallDIDtrunLgroupsb
Page l-8 
						

							INTER-TELPRACTICESIMX/GMX 256 INS’E4LLATION Lik MAINTENANCESPECIFICATIONS
Issue 1, November 1994
CONTENTS
SPECIFICATIONS1. Introduction
.........................................................2-2
2.Cabling And The Main Distribution Frame (MDF)........................2-4
. Station Connections...........................................
..i.2-4
B. 
‘Ihnk Connections...............................................2-5
3. Equipment Cabinet
..................................................2-6
. 
E&ipment Cabinet Description....................................2-6
B. Functional Description............................................2-6
. Environmental Requirements......................................2-8
D. System Power Supply.............................................
2-8E. Circuit Cards
....................................................2-10
4. Station Instruments..................................................2-21
. IMX 256 
Keysets.................................................2-21B. 
GMX.256 Keysets................................................2-25
C.IMX 256 DSS/BLF Units..........................................2-27
D. GMX-256 
DSWBLF Units..........................................2-28
E. Attendant Computer Consoles
......................................2-28
F. Single-Line Sets..................................................2-29
G. Off-Premises Extensions 
(OPXs)....................................2-30H. Playback Devices.................................................2-30
5. Additional System Equipment.........................................
2-31.
Personal Computer (PC) For On-Site Or Stand-Alone/Remote
Programming..................................................2-31
B.Programming PC And SMDR/SMDA Output Device Requirements......2-31
C System Battery Back-Up...........................................2-32
D. Additional Information............................................2-32
Page 2-l 
						

							SPECIFICATIONSIssue 1, November 1994INTER-TELPRAcTlcEsIMX/GMX 256 INSTALLATION & MAINTENANCE
1. INTRODUCTION
1.1This section of the manual describes the following
256 System hardware:
-Cabling and the Main Distribution Frame (MDF)
- Equipment Cabinet
- Power Supply
- Circuit Cards
- Station Instruments
- Additional System Equipment
1.2The 256 System has 16 slots available for station
andtrunkcards.l%emarimumnumber of stations and
trunk9 that can be installed&pen& on the 
number and
typ of cards; stationinsmunents,aMww0 ~PP&mod&s used. For example, there could be as many as
184 trunks installed (using one 
Keyset Card [required],
four 
Tl Cards [the maximum allowed], and 11 other-
type trunk cards). 
Or, there could be as many as 256 sta-
m tions (using a combination of digital keysets, 8-line
IMX AIM keysets, and single-line sets).NOTE: Generally, one station instrument can be in-
stalled on each available station circuit. However, thenew 
84ine “dual-circuit” IMX AIM keyset has been
specially designed so that two of these keysets can be in-
stalled on a single circuit, if desired. 
Keyset Cards can
be equipped with any combination of the various 
keyset
models.
1.3The trunks and stations are controlled by the cir-
cuit cards in the equipment cabinet.
1.4A wide variety of station instruments can be used
on the Inter-Tel 
IMX and GMX-256 Systems, including:
,I
IMX 256 Digital Station Instruments
l
Standard Digital Keyseta (also referred to as Stan-
dard Digital Terminals)
- display and non-displayl Executive Digital 
Keysets (also referred to as
Executive Digital Terminals) - display only
0 Digital Direct Station Selection/Busy Lamp Field
(DWBLF) units
IMX 256 Analog Station Instruments
l
24-Line AIM Keysets (display only)
0
0
0
0
0
0
0
0
0
0
12-Line AlM Keyseta (display only)
8-Line Dual-Circuit AIM Keysets (display only)
24-Line 
Keysets (standard and display)
12-Line 
Keysets (standard and display)
8-Line Keysets (non-display only)
Attendant Computer Consoles
DSS/BLF Units
Enhanced Single-Line Sets 
(ESLSs)
Single-Line Instruments 
(SLIs)
Industry-Standard Single-Line, Dual-Tone
Multi-Frequency 
(DTMF) Sets
NOTE: With the proper software package, the Inter-Tel
GX station instruments can also be installed on the IMX256 System. Refer to Appendix A in the back of the
manual for complete information.
GMX-256 Analog Station Instruments
0
‘0
0
0
0
0
0
0
0
0l
0
0
Inter-Tel/DVK 24-Line Keysets (standard and dis-play)
Inter-Tel/DVK 12-Line Keysets (standard and dis-play)
Inter-Tel/DVK 8-Line Keysets (standard and dis-
play)
GMX 24-Line Keysets (standard and display)
GMX 12-Line 
Keysets (non-display only)
GX 24-Line 
Keysets (standard and display)
Attendant Computer Consoles
Inter-Tel/DVK Direct Station Selection/Busy Lamp
Field 
(DSWBLF) Units (single or tandem)
GMX 
DSWBLF Units (single only)
GX 
DSWBLF Units (single or tandem)
GMX Single-Line Instruments 
(SLls)GX 
SLIS
Industry-Standard Single-Line, Dual-Tone
Multi-Frequency 
(MMF) Sets
NOTE: For more information on the GX and 
GMX sta-
tion instruments, refer to appendixes 
Aand Bin the back
of this manual.
Page 2-2 
						

							INTER-TELPRACTICESlMX/GMX 256 INSTALLATION & MAINTENANCESPECIFICATIONSIssue 1, November 1994
1.5A wide variety of optional system equipment can
also be installed, including:
Off-premises extensions 
(OPXs) and OPXrepeaters,
refer to pages 2-30 and 3-30.
Playback devices, see pages 2-30 and 3-95.
Output device(s) for the Station Message Detail Re-
cording (SMDR), error recording, and Station Mes-
sage Detail Accounting 
(SMDA) features, refer to
pages 2-31 and 3-98.
System battery back-up 
(uninterruptable power sup
ply or standby power supply), refer to page 2-32.
?kro external music sources, refer to pages 2-10 and3-99.Power failure transfer equipment, refer to pages
2-11 and 3-30.Night switch equipment, refer to pages 2-11 and
3-30.
General signaling devices, refer to pages 2-11 and3-30.
External paging speaker equipment, refer to pages
2-6 and 3-98.
Doorbox, refer to page 2-32.Multi-port voice mail 
equipment, refer to page
2-32.
Facsimile machine, refer to page 2-32.
Talkback speaker equipment, refer to page 2-32.
Page 2-3 
						

							SPECIFICATIONSIssue 1, November 1994INTER-TELPRACTICESIMX/GMX 256 INSTALLATION & MAINTENANCE
2.CABLING AND THEMAIN
DISTRIBUTION FRAME (MDF)
2.10xwctions between the hnks, station instru-
ments, external equipment, and the station and trunkcir-
cuit cards are made at the MDF. The MDF is made up of
industry-standard, 
66Ml-SO-type terminal blocks and,if using 
Tl Cards, eight-conductor (RJ48C) modular
jack assemblies. Bridging clips are used on all terminalblocks to complete the connections. As many as 17
blocks may be needed, including any combination of thefollowing: 
_l
0
0
I0
0
l-15 blocks for CO trunk terminations and Loop/
Ground Start Card 
(LGC) and/or Loop Start Card
(LX) terminations.
1-15 blocks for DID trunk terminations and Inward
Dialing Card 
(IDC) terminations.
1-15 blocks for E&M trunk terminations and E&M
Card 
@MC) terminations.1-16 blocks for station cabling terminations and
Digital Keyset Card (DKSC), Keyset Card (KSC orRX-D), Single-Line Card (SLC), and/or Inward
Dialing Card (IDC) terminations.
1 block for optional system equipment terminations
and ROM Central Processing Unit 
(RCPU) Card ter-
minations.
2.2The MDF requires at least a 4 x &foot (1.2 x
2.4meter), @rich plywood backboard. (Depending onthe number of stations and trunks installed, a larger
backboard may be necessary.) This will allow room tomount the terminal blocks, modular jack assemblies,
and any optional peripheral equipment.A. 
SllATION CONNECTIONS
2.3For each keyset, analog DSS/BLF Unit, AttendantComputer Console, single-line set, and playback
device, three-pair (24 AWG) twisted cable is run from
the station location to the MDF. All station cables are
terminated on blocks at the MDF and on six-conductor
modular jack assemblies at the station locations.
NOTE: It is recommended that three-pair twisted cable
and six-conductor modular jacks be used for all station
ConnectiOllS. This allows the various types of station in-
struments to be easily interchanged if necessary. How-ever, if desired, 
ESLSs, SLIs, single-line DTMF sets,
and playback devices can be installed using one-pair
twisted cable and four-conductor modular jacks.
2.4Industry-standard, 
25-pair telephone cable is used
to connect the station blocks to their corresponding sta-
tion cards. Female 
%-pin amphenol-type connectors on
the cables attach to the male connectors on the station
cards in the cabinet.
2.5To meet Part 15 of FCC Regulations, all station
cables must be equipped with ferrite beads. 
‘Iwo ferrite“split” beads (two half beads) are installed on each
25-pair cable just below the amphenol-type connector.
The beads help to reduce electromagnetic interference
(EMI) and radio frequency interference (RPI).
NOTE: Each ferrite split bead, which is actually half ofa fall bead, is ordered individually (see REPLACE-
MENT PARTS for the part number). Two split beads are
required to form one complete bead.Page 2-4