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

							~LF~RA&CTICESii?INLATION & MAINTENANCE
!3PEClFICATlONSIssue 1, November 1994B. GMX-256KEYSETS
4.29A maximum of 128 keysets can be connected to
the GMX-256 System. Refer 
to page 3-81 for GMX-256
keyset installation instructions. The following analog
models are available:
0Inter-Tel/DVK 24-Line Keysets (standard and dis-play)
0 Inter-Tel/DVK 12-Line Keysets (standard and dis-
play)
0 Inter-Tel/DVX 8-Line Keysets (standard and dis-
play) 
-l
GMX 24-Line Keysets (standard and display)
0GMX 12-Line Keysets (non-display only)
0GX 24Line Keysets (standard and display)
NOTE For more information on the GX and 
Gh4X key-sets, refer to appendixes A and B in the back of this
manual.
4.30For illustrations of the 
Inter-Tel/DVK keysets,
refer to the drawings beginning on page 2-33. The fea-
ture keys, speed-dial keys, call keys, and station pro-grammable keys shown in the drawings are as they
appear when the system is in the default configuration.4.31 The 
Inter-Tel/DVX 24-line keyset dimensions
are:Height 3.8 in. (9.7 cm.)
Width9.2 in. (16.5 cm.)
Length 
95in. (24.1cm.)Weight 2.8 lb. (1.3 kg.)
4.32 The 
Inter-Tel/DVK 12-line keyset and 8-line
keyset dimensions are:Height 3.8 in. (9.7 cm.)
Width7.0 in. (17.8 cm.)
Length 9.5 in. (24.1 cm.)
Weight 2.5 lb. (1.1 kg.)
433All 
Inter-Tel/DVK keysets have the following
design features in their default con@uration:
12-key pushbutton keypad
Avariety of feature keys (some of whichmay be des-
ignated as user programmable)
IC/CO speed-dial (SD) keys with light-emitting
diode (LED) indicators
Four call keys with LED indicators for incoming call
access and indication437All newer 
keysets and handsets have been de-
signed using “electret” microphone circuitry, rather
than the “dynamic” microphone circuitry used on many
previous Inter-Tel 
keyset models. Electret keysets and
handsets are not electrically compatible with dynamic
keysets and handsets.
4.38If a dynamic handset is attached to an 
electret
keyset, the handset transmit levels will be noticeably
lower. If an electret handset is attached to a dynamic
keyset, the handset will not transmit. (In both cases, nei-
ther the 
keyset nor the handset will be damaged.)
Integrated speakerphone
Page 2-25439
Electret keysets can be identified by the man-
ufacturer’s label on the bottom of the keyset. Electret
handsets can 
be identified by the “El” embossed in the
recess for the wall-mount hook (near the receiver).l
Ring and voice volume controls (using the VOL Up
and VOL DN keys)
l Slide-out directory cardl
Self-test feature (for testing keyset functions)l
Hearing aid-compatible @AC) handsetl
Reversible baseplate for wall mountingIntegrated Speakerphone
4.34Abuilt-in, integrated speakerphone is standard in
all 
keysets. The integrated speakerphone allows users to
place and receive outside calls and intercom calls with-
out lifting the handset. Once a call is connected, the 
key-
set user may speak 
handsfiee over the speakerphone or
lift the handset to speak privately. When using the hand-
set, the user may switch to the speakerphone by pressingthe 
SPKR key and replacing the handset. If enabled,
pages and/or background music may be broadcast over
the speaker when the phone is not being used.Liquid Crystal Display (LCD)
4.35Each “display” keyset has a liquid crystal display
(LCD) with two 
16-character lines. The display helps
the user to process calls more 
e5ciently and profession-
ally. There are display messages for date and time, num-
bers dialed, call cost data, reminders, do-not-disturb,
forwarding, voice mail processing, incoming calls, sta-
tion and system status, system alarms, and 
program-
miug. These displays are indicated throughout the
FEMURES section of the manual.
4.36All standard 
Inter-Tel/DVX keysets can be con-verted to display sets by installing an LCD Unit. The
24&e keysets use the Zarge LCD Kit (part no.
828.1166). The 12-line and 8-line keysets use the small
LCD Kit (part no. 828.1165).
Electret Circuitry 
						

							SPECIFICATIONSIssue 1, November 1994INTER-TELPRACTICEsIMX/GMX 256 INS~TION & MAINTENANCE
Optional Headsets
4.40A headset may be attached to any keyset by un-
plugging the handset 
from the handset jack on the base
of the 
keyset, plugging the headset into the handset jack,
and entering a feature code to enable the headset. The
SPKR key, which is used to turn the headset on and off,
is lit when placing and receiving calls and unlit when the
headset is not in 
use. The keysets are compatible with
industry-standard, four-conductor, modular headsets
that have dynamic microphones, or carbon-microphone
headsets that are 
connected to the keyset through an ex-
ternally powered 
jackset (which makes the headset dy-
namic-compatible). Refer to page 
3-86 for installation
illStNCtiOUS.Optional Data Port Module
4.41All Inter-TeUDVKkeysets maybe equipped with
optional Data Port Modules (refer to 
REPLACFMJZNT
PA#rs for the part number). The module contains a
four-conductor, RJll modular jack that can be used to
connect 
either a data device (such as a personal comput-er equipped with a modem) or a loud ringing adapter
(LRA) and an external signaling device (such as a loud
bell, horn, flashing light, etc.) to the 
keyset. The Data
Port Module is a source for 
2O-26mA of loop current(constant current source). Refer to page 
3-87 for in-
structions on installing the optional Data Port Module.
4.42Specifications for modem-equipped data de-
vice: The data device must have a 
direct-connection
modem. The modem must be externally powered (or ca-
pable of operating on 
2omA of loop current) and have an
RJll CO interface. The data device can be used with the
keyset to communicate with remote data. equipment
over voice channels being used for CO or intercom calls.
Refer to pages 
3-87 and 4-101 for installation and oper-
ation instructions.4.43 
Specitications for loud ringing adapter
(: An external LRAmay be connected to the Data
Port Module to provide a relay for controlling externalsignaling devices. The LRA is connected to the Data
Port Module, and the external signaling device is con-
nected to the LRA. Refer to page 
3-89 for installation
instructions. Each time the 
keyset rings, the Data Port
Module provides 
2O-26ti of loop current to the LRA
This causes the LRA contacts to close and activates the
signaling device. The LRA is not affected by the ring
tone or the ringer volume of the 
keyset. The LRA must
be capable of operating on 
2OmAcurrent (approximate-ly 2ovDC).
Page 2-26 
						

							lNlxR-TELPRACTIcESIMX/GMX 256 INSTALLATION & MAINTENANCESPECIF’ICATIONS
Issue 1. November 1994
C.IMX 256 
DSWBLF UNlTSI
4.44The lMX 256 System can have as many as 50
keyset circuits equipped with DSS/HLF Units. For ex-
ample, there could be a maximum of 50 digital 
keysets
(i.e., DKSC circuits) equipped with up to four digital
DSS/BLF Units each. Or, there could be a maximum of
50 KSC or KSC-D circuits equipped with one analog
DSS/BLF Unit each. Or, there could be any combination
of the two using up to 50 
keyset circuits.
4.45Each unit provides one-key access to 60 num-
bers. The 
numbm can be station extension numbers,
hunt group pilot numbers, system feature codes, or sys-
tem speed-dial numbers.
4.46Digital 
DSS/HLF Units are physically attached
to and programmed to be used with specific digital key-
sets. The units are connected in series to the PC Data
Port Module 
(PCDPM) on the back of the corresponding
keyset. Unlike analog units, digital DSS/BLF Units do
not require station cabling separate from the keyset’scabling; instead, they are powered by their own AC
transformer. If desired, all units can be connected to
keysets installed on the same Digital Keyset Cards. (Re-fer to page 3-90 for digital 
DSS/BLF Unit installation
instructions.)NOTE: Digital 
DSSBLF Units always require their
own separate AC transformers. For a diagram of AC
transformer requirements, refer to Figure 2-2 on page2-24.
4.47Analog DSS/HLF Units are programmed to be
used with specific analog keysets, but are not physicallyattached to the 
keysets. The units can be distributed
among several 
keysets or, if desired, they can be
assigned to one 
keyset. Each unit requires a KSC or
I
KSC-D circuit that is separate from the keyset’s circuit.
If50 station circuits are used for analog 
DSS/HLFUnits,50 fewer analog 
keysets and/or Attendant Computer
Consoles can be installed. Up to four analog units canbe
installed on a single Keyset Card. (Refer to page 3-92
for 
IMK DSS/BLF Unit installation instructions.)
4.48For illustrations of the 
DSS/HLFUnits (and other
station instruments), refer to the drawings 
beginuing on
page 2-33.
4.49Digital 
DSS/BLF Unit dimensions are:
Height 3.0 in. (7.6 cm.)
Width 7.5 in. (19.1 cm.)
Length 9.0 in. (22.9 cm.)
Weight 1.7 lb. (0.8 kg.)
._
4.50lMX DSS/HLF Unit dimensions are:Height 5.5 in. (14.0 cm.)
Width 9.0 in. (22.9 cm.)
Length 9.6 in. (24.1 cm.)
Weight 2.0 lb. (0.9 kg.)
4.51As stated earlier, each DSS/HLF Unit provides
one-key access to up to 60 numbers. These numbers can
be station extension numbers, hunt group pilot numbers,
or system feature codes, or system speed-dial numbers.
The layout of the keys and the 
numbets they access are
m
assigned using one of up to eight key maps in database
progr-g.4.52 Together, the lamps in the keys create a busy
lamp field that indicates the status of each station or hunt
group assigned to the keys. The LED indicator in the key
is solidly lit when the associated station is busy, flashes
slowly when the station is in do-not-disturb, flashes fast
when the station has a call ringing in, or flutters continu-
ously if the station is causing a 
SDXI’ION OFF-HOOK
system alarm. If assigned to a hunt group, the LED indi-
cator is solidly lit when all stations in the hunt group are
unavailable (busy, forwarded, in do-not-disturb, or re-
moved 
from the hunt group) and it flashes fast when a
call is camped on to a hunt group.
Page 2-27 
						

							SPECIFICATIONS
Issue 1, November 1994INTER-TELPRACTICESlM.WGMX 256 INSmTlON & MAINTENANCE
D.GMX-256 DSWBLF UNITS453There can be a maximum of 50 Direct Station
Selection/Busy Lamp Field 
@SS/BLP) Units installed
on the GMX-256 System, including any of the follow-illg:
l
Inter-Tel/DVK DSS/BLF Units -single or tandem
0GMX DSS/BLP Units -single only
0GX DSS/BLF Units - single or tandem
NOTE: For more information on the GMX and GX sta-
tion instruments, refer to appendixes A and B in the back
of the manual.
4.54A 
DSS/BLF Unit consists of either a single unit
or two units connected together to form a tandem unit.
Each single unit provides one-key access to 
6Onumbers,
while tandem units provide access to 120 numbers. The
numbers can be station extension numbers, hunt group
pilot numbers, system feature codes, or system 
speed-dial 
numbers.
4.55The 
50 single/tandem units can be distributed
among several 
keysets or, if desired, they can be as-
signed to one keyset. (Refer to page 3-93 for DSS/BLF
Unit installation instructions.)
4.56
DSS/BLF Units are programmed to be used with
specific 
keysets, but are not physically attached to the
keysets. Each unit requires a KSC-D circuit that is sepa-
rate 
from the keyset’s circuit. If 50 station circuits are
used for 
DSS/BLF Units, 50 fewer keysets and/or Atten-dant Computer Consoles can be installed. Up to four
units can be installed on a single Keyset Card.457For an illustration of the 
DSS/BLF Unit (and
other Inter-TellDVK station instruments), refer to thedrawings beginning on page 2-33. 
DSS/BLF Unit
dimensions are:Height 3.8 in. (9.7 cm.)
width7.0 in. (17.8 cm.)
Length 9.5 in. (24.1 cm.)
Weight 2.5 lb. (1.1 kg.)
4.58As stated earlier, each single DSS/BLF Unit pro-
vides one-key access to up to 60 
numbers. These num-
bers can be station extension numbers, hunt group pilot
numbers, or system feature 
codes, or system speed-dial
numbers. The layout of the keys and the numbers they
access are assigned using one of up to eight key maps(12 in expanded systems) in database programming.
The intercom number/key assignments are programmed
in two lists, DSS 1 and DSS 2. Single 
DSS/HLF Units
can be assigned with either list. Tandem Inter-Tel/DVK
units are assigned with the DSS 1 list, then an internal
strap is set to identify the key arrangement each individ-
ual unit will use.
4.59Together, the lamps in the keys create a busy
lampfieldthatindicatesthestatusofeachstationorhunt
group assigned to the keys. The LFD indicator in the key
is solidly lit when the associated station is busy, flashes
slowly when the station is in do-not-disturb, flashes fast
when the station has a call ringing in, or flutters continu-
ously if the station is causing a STATION OFF-HOOK
system alarm. If assigned to a hunt group, the LED indi-
cator is solidly lit when all stations in the hunt group are
unavailable (busy, forwarded, in do-not-disturb, or re-
moved from the hunt group) and it flashes fast when a
call is 
camped on to a hunt group.E.
A’ITENDANT COMPUTER CONSOLES
4.60 The Attendant Computer Console is an 
IBM-
compatible personal computer that is connected to an
available KSC or KSC-D circuit (they cannot be con-
nected to DKSC circuits). The computer contains a pro-
prietary circuit card and special software. It is primarily
designed for use by attendants of larger 256 Systems 
-
those systems with so many station users that it would
make using 
DSS/BLF Units somewhat awkward. How-
ever, due to its enhanced functionality, including elec-tronic text messaging and directory dialing, the
Attendant Computer Console is also an attractive option
for smaller 256 Systems as well.
4.61Attendant Computer Console design features in-
clude:
IBM XT-, AT-, or 
386-compatible processing unit
CGA, 
EGA, or VGA monitor and Monitor Interface
Card
122-key custom keyboard
Headset operation
Specially-designed circuit card and interface soft-
wareNOTE For additional information on the Attendant
Computer Console, along with detailed installation and
programming instructions, refer to the manual included
with the console.
Page 2-28 
						

							~LI&JymsSTALLATION & MAINTENANCE
SPECIFICATIONSIssue 1, November 1994F. SINGLE-LINE SETS
4.62Up to 240 single-line sets may be installed on the
256 System. The models available are:
8Enhanced Single-Line Sets (EEiLSs) -available on
IMX 256 Systems only
0 Single-Line Instruments (SLIs)
0Industry-standard, single-line DTMF sets
4.63For illustrations of the 
ESLS and SLI (and other
station instruments), refer to the drawings beginning on
page 2-33. The feature keys shown in the drawings are
as they appear when the system is in the default 
conflgu-
ration.
4.64The dimensions of the 
ESLS are:Height 45 in. (11.4 cm.)
Width6.5 in. (16.5 cm.)Length 9.5 in. (24.1 cm.)
Weight 2.2 lb. (1.0 kg.)
4.65The dimensions of the SLI are:Height 3.5 in. ( 8.8 cm.)
Width7.5 in. (18.8 cm.)
Length 9.0 in. (22.5 cm.)
Weight 2.0 lb. (0.9 kg.)
4.66ESLS design features include:
0 Nine user-programmable feature keys and a non-
programmable timed hookflash (FLASH) key
0A neon light for message waiting indicationl
A ring volume thumbwheel control
0 Hearing aid-compatible @AC) handset (may be
equipped with a handset amplifier as described onpage 2-22)Reversible baseplate and cradle hook for wall
mounting
A ringer that can be set for AC or DC by moving a
jumper strap located on the control board
Selectable ring pitch jumper strap 
(HI or LO) on the
control board
4.67SLI design features include:
0 Four user-programmable feature keys and a non-
programmable timed hookflash (FLASH) key
0A ring volume thumbwheel controll Hearing aid-compatible 
(HAC) handset (may be
equipped with a handset amplifier as described on
page 2-22)l
Reversible baseplate for wall mounting
0 AringerthatcanbesetforACorDCbymovinga
jumper strap located on the control board
4.68Single-line set users access some station features
simply by lifting the handset and pressing a feature key
(or entering a feature code). Other features are accessed
using a combination of a hookflash (FLASH key) and a
feature key or code. Refer to the 
FEMURES section of
this manual for details.
4.69When single-line sets are connected to 
Single-Line Cards 
(SLCs), they must be equipped with AC
ringers 
(ESLSs and SLIs have internal jumper straps
that can be moved to set the ringer for AC or UC). When
connected to Inward Dialing Cards 
(ID&), single-line
sets may have AC ringers by setting the 
lDC circuit for
AC ringing, or they may have DC ringers by setting the
circuit for DC ringing. (Refer to page 3-95 for 
single-
line set installation instructions.)
NOTE: 
IDCs do not support message waiting applica-
tions. If single-line sets with message waiting lamps are
installed on 
IDCs, the lamps will not function.
Page 2-29 
						

							SPECIFICM’IONSIssue 1, November 1994INTER-TELPRACTlCE8IMX/GMX 256 INSTALLATION & MAINTENANCE
G. OFF-PREMISES EXTENSIONS 
(OPXs)
4.70An OPX is an AC ringer-equipped BSLS, SLI, or
single-line 
M’MF set that is placed in a remote location
and connected to the system through a telephone com-
pany OPX circuit or a customer-provided circuit.
4.71Off-premises stations are connected to Inward
Dialing Cards (up to eight circuits on a card) or 
Tl Cards
(up to 24 circuits on a card). If necessary, the receive
gain and/or the transmit gain for each circuit can be ad-
justed in database programming (see page 5-30 for de-tails). 
_NOTE: 
lf connecting OPXs, Inward Dialing Cards
must be used. FCC regulations prohibit connecting
OPXs to Single-Line Cards.4.72 The OPX circuits provided by the telephone
company are identified with Facility Interface Codes
(FE): Class A, OL13A; Class B, OL13B; or Class C,
OL13C. The service order code is 9.OF (fully protected
private circuit). 
Ifthe impedance does not exceed a loop
measurement of 800 ohms (loop of 15,600 feet using
24AWG wire), a customer-provided circuit between the
remote location and the system may be used.
4.73The 
8OO-ohm loop limitation is usually suitable
for accessing on-premises stations from off-premises
stations. However, for applications where one off-pre-
mises station will be calling another through the station
card, the impedance between the two off-premises sta-
tions (both circuits added together) must be less than
800 ohms (loop measurement). 
In this situation, a Class
A or B FIC circuit is preferable.
4.74When an 
IDC circuit is designated for OPX use in
database progr
amming (see page 5-170), its voice vol-
ume levels are increased approximately 3dB over nor-mal single-line set voice volume levels. This is an
attempt to compensate for any loss in the external OPX
circuit. However, in certain off-premises applications,
the voice volume levels may still be unacceptable. This
degradation in voice volume is due to the natural voice
frequency range limitations of the telephone company
or customer-provided circuit. To increase the frequencyrange, installation of a two-wire, negative impedance
repeater unit is recommended. Such units typically pro-
vide from O-15 decibels of voice volume gain and allow
regulation of the gain in each direction when simulta-neous voice transmission 
oczurs. The switching sensi-
tivity on the unit should also be adjustable.
4.75The repeater unit is installed at the 
MDFbetween
the station block and the cabling to the off-premises sta-
tion. (Refer to page 3-30 for OPX installation instruc-
tions.) When ordering a repeater unit, consult with thesupplier for ordering the proper mounting shelf and
power supply for the unit. Additional information on op-
erating and adjusting the repeater unit is generally in-
cluded with the product.
“.,?,
iH. PLAYBACK DEVICES
4.76A playback device is an answering machine that
answers the call, plays a message, and then disconnects
from the call. Playback devices are installed like 
siugle-
line sets, using three-pair twisted cable and six-conduc-
tor modular jacks (or, if desired, one-pair twisted cable
and four-conductor modular jacks). The device must be
capable of the following functions: detect ringing, pro-
vide ring trip, and automatically disconnect when the
announcement is completed.
4.77Because most playback devices respond to AC
ring signals, they are attached to SLC circuits or 
IDC
circuits that are set for AC ringing. If the playback de-vice responds to DC ring signals, an Inward Dialing
‘Card circuit that is set for DC ringing must be used. (Re-
fer to page 3-95 for playback device installation instruc-
tions.)
NOTE: For optimal performance, it is recommended
automated attendant playback devices be installed on
IDC circuits rather than SLC circuits.
4.78Hunt groups can have two special stations that
help process calls: 
announcement stations and overflow
stations. These stations can be equipped with station in-struments or playback devices. Automated attendant
stations can also be 
equipped with playback devices.
(See FEKNRES, page 4-17.)
4.79The playback device is programmed as a regular
single-line station and is assigned an extension number.
If the device is sensitive to camp-on tones and discon-
nects calls, the programmer can disallow the camp-on
tone for that station circuit (refer to 
PROGRAMMING,
page 5-30).Page 2-30 
						

							pERLz&cnSTALLATION & MAINTENANCE. SPECIFICATIONSIssue 1, November 19945. ADDITIONAL SYSTEM
EQUIPMENT
A.PERSONAL COMPUTER (PC) FOR
ON-SITE OR STAND-ALONEIREMOTE
PROGRAMMlNG
5.1The device used for on-site or stand-alone/remote
programming must be an IBM 
AT+ompatible PC with aminimum: 
5MB available memory on the hard disk
drive, Sy4-inch (1.2MB) or 3%~inch (1.44MB) double
sided/high density floppy disk drive, 
640k RAM (withminimum 
512k available), MS-DOS 3.3, and an EGA
graphics monitor. A grogramming mouse is optional (if
used, install on au unassigned COM port). For remote
maintenance, a 
3CKLbaud or 1200-baud modem is alsoneeded. (See PRCGRAMMIN
G, page 5-3, for addi-
tional information on remote system maintenance.) To
connect the PC to the RCPU Card for on-site program-
ming, refer to the following information.
33. PROGRAMMIN
GPC AND SMDR/SMDA
OUTPUT DEVICE REQUIREMENTS
5.2The on-site programming PC and the optional out-
put device(s) for the Station Message Detail Recording(SMDR) and Station Message Detail Accounting
(SMDA) features must have the characteristics de-
scribed in the following paragraphs.
5.3To connect a PC or an output device to one of the
DB9 serial ports (PGRT A or PORT B) on the RCPU
Card, one end of the cable between the two must have an
RS-232-G-compatible, female g-pin subminiature “D”
connector. The other end of the cable must be compat-
ible with the output device. Consult the owner’s guidefor the device to verify that the pin functions are the
same as those shown in the following chart. Ifnecessary,
rewire the connector on the device to match the require-
ments.
FUNCTIONEll!i
DataCarrierDetect(DCD)Re&ve Data (RXD)Transmit Dab (J-XD)
Data Terminal Ready (M-R)Signal 
GroundData Set Ready (DSR)Requti To Send (RIB)
Clear To Send 
(Cl-S)Ring hiicatorSignal to 256
Darato256Data hm 256Signal 6vm 256@ways me*)Reference GroundSignal to 256SigmaI from 256(always true*)Signal to 256
Signal to 256
12
3
A
56
7
89
True = steady signal >+SV
5.4The following cable can be created to connect one
of the 
DB9 ports on the RCPU Card to the DB25 port
found on some PCs and output devices.
JO=DBpJO pc/olJlPuT QE2s2
3
7
5A
6
8
20
53The following cable can be created to connect oneof the 
DB9 ports on the RCPU Card to the DB9 port
found on some PCs and output devices.
JO PCK)uTpIJJ DB@
5.6When the system is in the default conf@uration,
the 256 output device ports 
(PGRT A and PORT B) are
enabled for “software” handshaking. Most output de-
vices are designed for software handshaking, which is
the use of 
“X-ON” and “X-OFF” characters to indicate
readiness to send or receive data. Refer to the device’s
operating manual to determine if it uses 
X-ON/x-OFF
characters.
5.7If the device does not support 
X-GN/X-OFP char-acters, hardware handshaking may be enabled (see
PRGGRAMMING, page 5-169). When enabled for
hardware handshaking, signals are sent over the comrec-
tor pins to indicate readiness to send or receive data. The256 
DB9 port will send a logic true (>+!5V) on pin 4
(Data Terminal Ready) and pin 7 (Request To Send)
when it is ready to receive data. In addition, the 256 DB9
port will monitor pin 6 (Data Set Ready), pin 8 (Clear To
Send), or both (depending on how the 256 System is pro-
grammed) and will only send data if it receives a logic
true 
(>+5V) over the programmed pin(s). Ifthe 256 DB9port receives a logic false 
(c-5V) to indicate that the
buffer on the attached device is full, it will not send data.
5.8To meet Part 15 of FCC Regulations, all RS-232-C
cables must be equipped with ferrite beads. Two ferrite
“split” beads (two half beads) are installed on each cable
just below where the cable connects to the system. The
Page 2-31 
						

							SPECIFICATIONSIssue 1, November 1994INTER-TELPRACTICE-SIMX/GMX 256 INSWTlON & MAINTENANCEbeads help to reduce electromagnetic interference
(EMI) and radio frequency interference (RFI).
NOTE: Each ferrite split bead, which is actually half ofa full bead, is ordered individually (see REPLACE-
MENT PARTS for the part number). Two split beads are
required to form one complete bead.
5.9The on-site programming PC and 
SMDR/SMDAoutput devices must communicate at 110, 300, 600,
1290,2400,4800,9600, or 19200 baud. (NOTE: The
19200 baud rate is for outgoing data only. The maxi-mum programming baud rate is 9600.) System baud
rates are set independently in database programming.
other specitications include:
0The data format must be 8 bit standard ASCII.
0Parity is off (ignored).
0Communication is full duplex.
0There is one start bit and one stop bit.
5.10The output devices, whether used for SMDR or
SMDA, must be able to print reports with a width of 80characters. The devices must not have cables longer
than 50 feet (15 meters).
C.SYSTEM BATTERY BACK-UP
5.11To provide back-up power in the event of an AC
power failure or brownout condition, the 256 System
power supply can have optional battery back-up using a
customer-provided 
uninterruptable power supply (UPS)
unit or standby power supply (SPS) unit.
5.12It is recommended 
that a power supply unit with
the following characteristics be installed:
Sine wave output
Transfer time of less than 20 milliseconds
Output rating of 700 Watts (minimum needed for a
fully populated system; for smaller system require-
ments, contact Customer Support)External or internal batteries
Low voltage cutoff circuit of 105VAC (minimum)
NOTE: Even if the power supply unit has the specifica-tions listed above, it 
camrot be guaranteed that it will
work properly with the 256 System. Contact Customer
Support for a listing of approved 
IIPS/SPS power sup
plies and installation instructions.
5.13Batteries comrected in series form a “string.“The
voltage of the string is equal to the sum of the individualbattery voltages. For example, five 6V batteries con-
nected in series form a 30V battery pack. If desired, con-nect two strings in parallel to double the amp/hour
rating, which results in longer discharge rates; the volt-
age level remains the same as a single string.
5.14Batteries must be fully charged when installed.
Charge each individually using a constant-voltage, cur-
rent-limited charger with less than three percent ripple.
The charge voltage per cell must be set according to the
manufacturer’s specifications. Be careful not to damage
the batteries by overcharging them. For example, new
Globe brand batteries require 25 days of float voltage or
25-30 discharge cycles to attain full capacity. Initial ca-
pacity might only be 
80 percent of rated capacity.
5.15
All batteries should be of the same age and AH
rating. Some manufacturers date batteries by stamping
them with a date code. For example, Globe stamps their
batteries with a code such as 
410-B, where 4 = the last
digit of year, 10 = the month, and B = the type of electro-
lyte. If a battery in a string needs to be replaced, the age
of the string will determine if a fresh battery can be add-
ed. If the string is two to three years old, adding a fresh
battery will reduce the life of the entire string. This is be-
cause a fresh battery will be overcharged, while the old-
er batteries are undercharged.
5.16Batteries may give off explosive and/or corrosive
gases. To reduce the effects of this gas, place the batter-
ies (or battery compartment) in a well-ventilated roomand coat the terminals with an anti-corrosive agent.
Avoid storing batteries; they will self-discharge and
their capacity decreases with age. If you must store bat-
teries, recharge them every six months. Recharge time
may vary depending on the charger’s current limit and
the battery’s state of charge.D. ADDITIONAL INFORMATION
5.17If necessary, contact Inter-Tel Customer Supportfor additional information on the optional equipment
listed below:
0
0
0
0
0
0
0
0
0
al
OPX Repeaters
LRAs and External Signaling Devices
Standby Power (system battery back-up)
Multi-Port Voice Mail
Facsimile Machine
Doorbox
Lightning and AC Surge ProtectionMultiple External Paging Zones and 
Talkback
Speakers
Headsets
Playback Devices
Power 
Failuxe Transfer
Page 2-32 
						

							INTER-TELPRACTICESlMX/GMX 256 lNSTALLATION & MAINTENANCESPECIFICATIONSIssue 1, November 1994FIGURE 
2-3.EXECUTIVE DIGITAL KEYSET (also called Executive Digital Terminal)
HEARING AID-COMPATIBLELCD WlTH SIX8 LCD MEtiU SELEG
(HAC) HANDSET16-CHARACTER LINESTION KEYS
INTERNAL
SPEAKER
\
5 SPEED-DIAL
KEYS2 LCD FEATURE
DIRECTORY
SCROLL KEYS
14 FEATURE
KEYS
RING AND VOICE
VOLUME
CONTROLSHANDSFREE
MICROPHONE
(underneath edge)
\
12-KEY
PUSHBUTTON
KEYPAD
NOTE: The keys are shown as they appear in the default key map configuration.
Page 2-33 
						

							SPECIFICATIONS
Issue 1, November 1!394INTER-TEL4PRACTICEsIMXIGMX 256 INS-TION & MAINTENANCE
FIGURE 2-4. STANDARD DIGITAL KEYSET (also called Standard Digital Terminal)
HEARING AID-COMPATIBLEOPTIONAL LCD WlTH TWO(HAC) HANDSET16-CHARAClER LINES
4 CALL KEYS
INTERNAL
SPEAKER
14 FEATURE
KEYS
F
\
RING AND VOICE
VOLUME
CONTROLS
Y
I
HANDSFREE
MICROPHONE
(underneath edge)
NOTE: The keys are shown as they appear in the default key map configuration.
Page 2-34
SPEED-
rL KEYS
/
EY PUSH-
DN KEYPAD
0