Inter-Tel GMX-48 INSTALLATION & MAINTENANCE Manual

							INTER-TEL PRACTICES 
GMX-48 INSTALLATION & MAINTENANCE SPECIFICATIONS 
Issue 2, May 1990 
C. KSU CONTROL BOARD, EXPANSION 
MODULE, AND ACCESSORY PORT 
MODULE 
3.15 
Descriptions of the KSU Control Board, 
Expansion Module, and Accessory Port Module are 
given in the following paragraphs. Drawings of them 
are located in the INSTALLATION section. 
KSU Control Board (KCB) 
3.16 The 
KCB contains the main controlling micro- 
processor and associated control logic and memory 
circuits. It is under the control of a program, stored in 
the ROM, which is activated when the system is pow- 
ered up. ROMs containing the system software are on 
a Memory (MEM) Board attached to the KCB. 
3.17 The KCB and its attached MEM Board contain 
the following: 
l Power suppIy connector (1Zpin connector on the 
end of a cable) for attaching the power supply DC 
cable to the KSU. For installation instructions, re- 
fer to page 3-24. 
c 
e 
l 
Music-on-hold connector (x-inch, two-conduc- 
tor, miniature phone jack with an input imped- 
ance of 9K ohms) is the input connection for an 
external music source (such as a radio, tape player, 
etc.). An AGC circuit on the KCB automatically 
holds the volume to a predetermined level that is 
slightly lower than the normal voice volume, as re- 
quired by FCC regulations. Optimal input level is 
0.775VRMS (OdB). For installation instructions, 
refer to page 3-49. 
External paging connector (RCA-type phono jack 
with an output impedance of 600 ohms) can be 
used to connect an amplifier and external paging 
network to allow paging to large areas, such as 
warehouses or loading docks. For external paging 
speaker installation instructions, refer to page 
3-50. 
RS-232-C 
connector (25pin subminiature “D” 
female connector) is the interface for an SMDR/ 
SAR output device, a programming terminal, or a 
modem for remote system maintenance. For 
more information, refer to page 2-16. 
Baud rate DIP switches are used to select the 
baud rate for the RS-232-C interface. The baud 
rates available for this port are 300, 1206, 2400, 
and 4800. 
NOTE: Only one of the four DIP switches should 
be in the ON (down) position at one time. 
Voltage test points for checking the system 
+5VDC, -12VDC, +3OVDC, and + 12VDC 
levels. To measure system voltage levels, voltme- 
ter probes are placed on the ground test point and 
the desired voltage test point. Refer to INSTAL- 
LATION, page 3-30, for details. 
LED indicators show proper operation (RUN), 
C.O. call(s) active (CO BUSY), intercom call(s) 
active (IC BUSY), system alarms (MINOR 
ALARM), database error occurrences (D-BASE 
ERROR), and database back-up battery connec- 
tion (BATT OFF). Refer to TROUBLESHOOT- 
ING for detailed LED information. 
Reset switch is used to manually reset the system 
during troubleshooting. This is a software reset 
(minor reset), not a hardware reset (major reset). 
Pushing this switch does the following: 
- Preserves the battery-backed database infor- 
mation, non-conference calls in progress, out- 
side calls being dialed, inter-station messages, 
calls on individual hold, do-not-disturb mes- 
sages, and reminder messages. A call on 
system hold is changed to individual hold at 
the station that placed it on hold. 
- Restores DTMF decoders and speech chan- 
nels, and resets the station clocks to match the 
system clock. Updates line key, DSS/BLF key, 
speed-dial key, and feature key lamp status. 
- Interrupts system operation, which discon- 
nects pages in progress, calls ringing in, and 
calls that are using the conference resources 
(as described on the next page). Camped-on 
calls are disconnected and queue requests are 
cancelled. 
- Terminates system and user programming. 
Database back-up batte’ry (3.5V lithium battery 
located on the MEM Board) that can support the 
database for at least two months of accumulated 
system down time. 
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							SPECIFICATIONS INTER-TEL PRACTICES 
Issue 2, May 1990 GMX-48 INSTALLATION & MAINTENANCE 
Back-up battery voltage test points and battery 
check button 
(located on the MEM Board) for 
checking the database back-up battery charge. If 
the battery voltage is not greater than 2.5VDC, 
the KCB must be returned for battery replace- 
ment. 
Back-up battery strap (JMP 1 located on the 
MEM Board) for activating the database back-up 
battery. The strap should be placed in the A posi- 
tion (over the lower two pins) before the KSU is 
turned on. When the KSU is taken out of service 
for repair or storage, the strap should be placed in 
the B position (upper two pins) to preserve the 
battery charge. 
NOTE: Placing the BBU strap in the OFF posi- 
tion erases the database. 
Conferencing resources for up to eight simulta- 
neous, five-way conferences. The conferencing 
resources also support the call forward, call trans- 
fer, and DISA features when two CO. lines are 
connected. Conferencing is not amplified. 
DTMF transmitter circuit generates DTMF 
tones whenever a keyset user manually dials a 
number or uses one of the system auto-dial fea- 
tures (ARS, call forward to the public network, 
station or system speed dialing, etc.). 
Music-on-hold (MOH) ON/OFF strap for enab- 
ling an external music source that is heard by 
callers when they are placed on hold or camped 
on. If connecting an external music source, place 
the strap in the ON position (over the left two 
pins) to enable music, or place the strap in the 
OFF position (right two pins) to disable music. If 
enabled, outside callers will hear music when 
placed on hold. If disabled, outside callers will not 
hear music when placed on hold. 
NOTE: If a music source is connected, the posi- 
tion of the MOH ON/OFF strap will not affect 
the ability of keyset users to receive background 
music. Also, regardless of the strap location, in- 
ternal station users will hear music when placed 
on hold by another station or when camped on. 
MOH HI/LO 
strap for setting the music-on-hold 
volume level. For a higher MOH volume level, place the strap in the HI position (over the right 
two pins). Or, for a lower MOH volume level, 
place the strap in the LO position (over the left 
two pins). 
Station circuitry for installing up to eight keysets 
or-DSS/BLF Units. 
NOTE: Keysets and DSS/BLF Units require sep- 
arate station circuits. Also, to equip a keyset with a 
secondary voice path, two station circuits are 
needed. 
Secondary voice path straps for enabling an odd- 
numbered station circuit to use the primary voice 
path of the following even-numbered station cir- 
cuit for off-hook voice announce and/or simulta- 
neous voice data communication. (Refer to pages 
3-14 to 3-16 for more information and necessary 
installation instructions.) Lf the station circuit is to 
have a secondary voice path, place the associated 
strap on the KCB in the OHVA position. Or, for 
normal station installation, place the strap in the 
NORM position. 
Male 50-pin amphenol-type connector for con- 
necting a cable from a station terminal block to 
the KCB. 
C.O. 
circuitry and modular jacks for connecting 
up to four loop start C.O. lines to the KCB. 
2A, 25OVAC, AGC 2 
(fastacting) fuse to protect 
the KSU from damage due to a short circuit in the 
station cabling. 
Expansion Module (EXP) 
3.18 
Up to five modules may be attached to the 
KCB. If desired, all five modules can be EXPs. Each 
EXP can be equipped with up to eight keysets or DSS/ 
BLF Units and up to four C.O. lines. An EXP con- 
tains the following: 
a Station circuitry for installing up to eight keysets 
or DSS/BLF Units. 
NOTE: Keysets and DSS/BLF Units require sep- 
arate station circuits. Also, to equip a keyset with a 
secondary voice path, two station circuits are 
needed. 
Page 
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							INTER-TEL PRACTICES 
GMX-48 INSTALLATION & MAINTENANCE ‘. 
SPECIFICATIONS 
Issue 2, May 1990 
Secondary voice path straps 
for enabling an odd- 
numbered station circuit to use the primary voice 
path of the following even-numbered station cir- 
cuit for off-hook voice announce and/or simulta- 
neous voice data communication. (Refer to pages 
3-14 to 3-16 for more information and special in- 
stallation instructions.) If the station circuit is to 
have a secondary voice path, place the associated 
strap on the EXP in the OHVA position. Or, for 
normal station installation, place the strap in the 
NORM position. 
Male 50-pin amphenol-type connector for con- 
necting a cable from a station terminal block to 
the EXP 
C.O. 
circuitry and modular jacks for connecting 
up to four loop start C.O. lines to the EXP. 
Address selection switches for indicating the posi- 
tion of the EXP in relation to the KSU. These 
switches must be set correctly in order for the sys- 
tem to operate properly. (Refer to INSTALLA- 
TION, page 3-32, for proper switch settings.) 
2A, 25OVAC, AGC 2 
(fast-acting) fuse to protect 
the KSU from damage due to a short circuit in the 
station cabling. 
Accessory Port Module (APM) 
NOTE: 
To install APMs, an Extended MEM Board 
with 
Advanced software (part no. 662.2101) or an Ex- 
tended MEM Board with 
Intermediate software (part 
no. 662.2103) is required. 
3.19 Up to two of the five modules that may be at- 
tached to the KCB can be APMs. Each APM can be 
equipped with up to six single-line devices (such as 
single-line sets, playback devices, voice mail units, 
FAX machines, etc.). Off-premises stations can be 
connected using an HVRA Unit, power supply, and 
ring generator. An APM contains the following: 
0 RS -232-C connector (using one of two six-conduc- 
tor modular jacks) is the interface for an SMDR/ 
SAR output device, a programming terminal, or 
an auto-answer modem for remote programming. 
This port operates only at 1200 baud. For more in- 
formation, refer to page 2-16. 
NOTE: Although there are two RS-232-C modu- 
lar jack connectors on the APM, only one connec- 
tor can be used at a time. 
DTMF decoding circuits (two) are used by the sys- 
tem whenever single-line devices are dialing and 
whenever features such as DISA and automated 
attendant are used. They are also used for the un- 
supervised C.O. call continuation feature (see the 
NOTE on page 5-17 of the PROGRAMMING 
section). These two decoders convert DTMF sig- 
nals to the digital codes used by the system. They 
are in use only while the dialed number is being 
processed, not for the duration of the call. If both 
DTMF decoders are busy, the user may camp on. 
. 
Tone generators are used to produce all of the sys- 
tem tones (busy, reorder, do-not-disturb, etc.) 
heard by single-line set, DISA, and automated at- 
tendant users. (Keysets generate their own system 
tones.) 
Station circuitry for installing up to six single-line 
devices. 
AC/DC straps for setting each station circuit to 
accept either AC-ringing devices or DC-ringing 
devices. 
Male 50.pin amphenol-type connector for con- 
necting a cable from a station terminal block to 
the APM. 
Address selection strap for indicating the position 
of the APM in relation to the KSU. This strap 
must be set correctly in order for the system to op- 
erate properly. (Refer to INSTALLATION, page 
3-34, for proper strap settings.) 
2A, 25OVAC, AGC 2 (fast-acting) 
fuse to protect 
the + 30V output. 
Page 2-9 
Station and C.O. Line Circuits 
3.20 The 
KCB and EXPs each have circuitry for up 
to eight keysets or DSS/BLF Units. APMs have cir- 
cuitry for up to six single-line devices. Each circuit is 
assigned a number (X.Y) according to its location in 
relation to the KSU (X = l-6) and its location on the 
KCB (Y = l-S), EXP (Y = l-S>, or APM (Y = l-6). 
For example, station circuit 1.2 is the second station 
circuit on the KCB. Station circuit 2.4 is the fourth 
station circuit on the first EXP attached to the KSU.  
						

							SPECIFICATIONS INTER-TEL PRACTICES 
Issue 2, May 1990 GMX-48 INSTALLATION 8z MAINTENANCE 
321 
When the system is initialized, the intercom 
numbers for the KCB and EXPs are assigned in order 
from circuit 1.1 (intercom number 100) to circuit 6.8 
(intercom number 147). The intercom numbers for 
the APMs are assigned in order from circuit 7.1 (in- 
tercom number 148) to circuit 8.6 (intercom number 
159). Intercom number assignments may be changed 
through database programming. Only circuit 1.1 is 
equipped (as the primary attendant’s keyset) when 
the system is initialized. Refer to PROGRAMMING, 
page 5-49, for more information. 
NOTE: No matter what position the APMs are lo- 
cated in relation to the EXPs, the first APM attached 
to the system is always assigned circuits 7.1 to 7.6 and 
the second APM installed is always assigned circuits 
8.1 to 8.6. 
322 The KCB and EXPs each have circuitry for up 
to four loop start CO. lines. Each of the four circuits 
is assigned a number (X.Y) according to its location in 
relation to the KSU (X = l-6) and its location on the 
KCB or EXP (Y = l-4). For example, C.O. line cir- 
cuit 2.4 is the fourth circuit on the first EXP attached 
to the KSU. C.O. line circuit 6.4 is the fourth circuit 
on the fifth EXP. 
323 When the system is initialized, C.O. line cir- 
cuits 1.1-6.4 are assigned to line keys l-24; circuit 1.1 is under line key 1, circuit 1.2 is under line key 2, and 
so on. Line key assignments can be reprogrammed 
through database programming. Also, unused line 
keys can be designated as feature keys. 
324 
-If desired, line key numbers maybe assigned on 
a tenant-by-tenant basis. Up to 24 lines can be distrib- 
uted among the tenant groups using four different 
line key arrangements (one for each tenant group). 
Refer to FEATURES, page 4-16, for more informa- 
tion. 
325 When the system is initialized, all C.O. lines 
are configured for DTMF signalling. If necessary, 
some or all of the lines can be reprogrammed for dial- 
pulse aignalling through database programming. 
NOTE: Single-line sets generate their own DTMF 
tones when dialing. If used on dial-pulse lines, both 
the DTMF tones generated by the phone and the 
dial-pulse signals generated by the system (via the 
DTMF decoders) are sent to the central office, which 
may be a problem if the central office recognizes 
both. To avoid this problem, single-line sets should be 
restricted to LCR only when using dial-pulse lines. 
Then, only the LCR-generated dial-pulse signals will 
be sent to the central office. 
Page 2-10  
						

							INTER-TEL PRACTICES 
GMX-48 INSTALLATION & MAINTENANCE SPECIFICATIONS 
Issue 2, May 1990 
4. STATION INSTRUMENTS 
4.1 A variety of station instruments can be used on 
the GMX-48 System. The system capacity for stations 
is: 
. 
l * 
A. 
4.2 
Total Station Instruments 48 
Keysets (24-line or 1Zline) O-48’ 
Single-Line Sets o-12 
DSS/BLF Units O-5” 
Keysets with secondary voice paths 
installed (24~line keysets only) O-24”’ 
It is strongly recommended that at least one 24.line display 
keyset be installed to receive system alarm messages and act 
as attendant for unsupervised C.O. recalls. When the system 
is initialized, circuit 1.1 is designated as a keysct and the pri- 
mary attendant. 
Keysets and DSS/BLF Units use separate station circuits. 
Therefore, for each DSS/BLF Unit installed, one less keysct 
may be installed. 
Xvo station circuits are required for each secondary voice 
path installation. Therefore, for each 24-line keyset installed 
with a secondary voice path, one less keysct may be installed. 
KEYSETS 
A maximum of 48 keysets can be connected to 
the GMX-48 System. Keysets are available in 24-line 
standard, 24-line display, and 1Zline (non-display) 
models. For illustrations of the keysets, refer to Fig- 
ures 2-3 and 2-4 on pages 2-22 and 2-23. Keyset 
dimensions are: 
2CLINE KEYSETS 
Height 3.5 in. (8.9 cm.) 
Width 8.8 in. (22.3 cm.) 
Length 9.0 in. (22.9 cm.) 
Weight 2.8 lb. (1.3 kg.) 
12-LINF KEYSETS 
Height 3.5 in. (8.9 cm.) 
Width 7.5 in. (19.1 cm.) 
Length 9.0 in. (22.9 cm.) 
Weight 2.5 lb. (1.1 kg.) 
4.3 The 24-line model has: Optional Liquid Crystal Display (LCD) 
a 
0 
1Zkey pushbutton keypad 
18 feature keys (10 of which are user program- 
mable) 
10 speed-dial (SD) keys with light-emitting diode 
(LED) indicators 
24 direct-access C.O. line keys with LED indica- 
tors (unused line keys may be designated as fea- 
ture keys through database programming) 
Integrated speakerphone 
Ring and voice volume controls 
l Slide-out directory card 
* Self-test feature (for testing keyset functions) 
l Hearing aid-compatible (HAC) handset 
l Reversible baseplate for wall mounting 
4.4 The 1Zline model has: 
1Zkey pushbutton keypad 
10 feature keys (three of which are user program- 
mable) 
8 speed-dial (SD) keys with light-emitting diode 
(LED) indicators 
12 direct-access C.O. line keys with LED indica- 
tors (unused line keys may be designated as fea- 
ture keys through database programming) 
Integrated speakerphone 
Ring and voice volume controls 
Slide-out directory card 
Self-test feature (for testing keyset functions) 
Hearing aid-compatible (HAC) handset 
Reversible baseplate for wall mounting 
4.5 A built-in, integrated speakerphone is standard 
in all keysets. The integrated speakerphone allows 
users to place and receive outside calls and intercom 
calls without lifting the handset. Once a call is con- 
nected, the keyset user may speak handsfree over the 
speakerphone or lift the handset to speak privately. 
When using the handset, the user may switch to the 
speakerphone by pressing the SPKR key and replac- 
ing the handset. If enabled, pages and/or background 
music may be broadcast over the speaker when the 
phone is not being used. (If desired, the integrated 
speakerphone can be disabled on a station-by-station 
basis through database programming.) 
4.6 Each 24-line display keyset has a liquid crystal 
display (LCD) with two 16-character lines. The dis- 
play helps the user to process calls more efficiently 
and professionally. There are display messages for 
date and time, numbers dialed, call cost data, remind- 
ers, do-not-disturb, incoming calls, station and system 
status, system alarms, and programming. These dis- 
plays are indicated throughout the FEATURES sec- 
tion of the manual. Standard 24-line keysets can be 
converted to display sets by installing an LCD Unit 
(part number 828.1052). 1Zline keysets cannot be 
equipped with displays. 
Page 2-11  
						

							SPECIFICATIONS 
Issue 2, May 1990 ‘,. INTER-TEL PRACTICES 
GMX-48 INSTALLATION & MAINTENANCE 
Optional Headsets 
4.1 
A 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 or receiving 
calls and unlit when the headset is not in use. The key- 
sets are compatible with industry-standard, four-con- 
ductor, modular headsets that have dynamic 
microphones, or carbon-microphone headsets that 
have an external AC power source. Refer to page 
3-41 for installation instructions. 
Optional Handset Amplifiers 
4.8 The typical handset amplifier is an external de- 
vice that plugs into the keyset (where the handset is 
normally connected); the handset is then plugged 
into the amplifier. Receiver voice volume is con- 
trolled by turning a thumbwheel (or similar control) 
located on the amplifier. Such amplifiers are general- 
ly equipped with a transformer that requires a 
1lOVAC outlet. Refer to page 3-41 for installation in- 
structions. 
Optional Data Port Module 
4.9 24-line keysets may be equipped with optional 
Data Port Modules (part number 828.1094). The 
module board contains a four-conductor, RJll modu- 
lar jack that can be used to connect either a data device 
(such as a personal computer equipped with a mo- 
dem) or a loud ringing adapter (LRA) and an external 
signalling 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 3-42 for instructions on install- 
ing the optional Data Port Module. 
4.10 Specifications for modem-equipped data de- 
vice: The 
data device must have a direct-connection 
modem. The modem must be externally powered (or 
capable of operating on 20mA of loop current) and 
have an RJll C.O. line interface. The data device can 
be used with the keyset to communicate with remote 
data equipment over the C.O. lines or intercom chan- 
nels. Refer to pages 3-42 and 4-90 for installation and 
operation instructions. 
4.11 Specifications for loud ringing adapter 
(LRA): 
An 
external LRA may be connected to the Data Port 
Module to provide a relay for controlling external sig- 
nalling devices. The LRA is connected to the Data 
Port Module, and the external signalling device is 
connected to the LRA. Refer to page 3-44 for instal- 
lation instructions. Each time the keyset rings, the 
Data Port Module provides 20-26mA of loop current 
to the LRA This causes the LRA contacts to close 
and activates the signalling device. The LRA is not af- 
fected by the ring tone or the ringer volume of the 
keyset. The LRA must be capable of operating on 
20mA current (0-20VDC). 
4.12 Some types of signalling devices generate a 
current/voltage rating that could damage the LRA. 
The following Wheelockproducts have been found to 
work properly with the GMX-48 System. 
Wheelock DCI-24-24 is an adapter that is used 
with any of a wide variety of Wheelock signalling 
devices. 
Wheelock CRT-D-37 is a dry contact relay that is 
used with other manufacturer’s signalling devices. 
4.13 The LRA output of the Data Port Module is 
connected to the dry contact input on the Wheelock 
unit. Wheelock products can be ordered from a local 
supply house, or call Wheelock directly at (201) 
222-6880. Installation and operation instructions are 
included with each device. 
Page 2-12  
						

							INTER-TEL PRACTICES 
GMX-48 INSTALLATION & MAINTENANCE ‘. 
SPECIFICATIONS 
Issue 2, May 1990 
B. DIRECT STATION SELECTION/BUSY 
LAMP FIELD (DSWBLF) UNITS 
4.14 
There may be a maximum of five DSS/BLF 
Units installed on the system. These units are pro- 
grammed to be used with specific keysets, but are not 
physically attached to the keysets. Each unit requires 
a KCB or EXP circuit that is separate from the key- 
set’s circuit. If five station circuits are used for DSS/ 
BLF Units, five fewer keysets can be installed. If 
desired, all five DSS/BLF Units may be connected to 
the KCB or to the same EXP. 
4.15 For a drawing of the DSS/BLF Unit, refer to 
Figure 2-5 on page 2-24. DSS/BLF Unit dimensions 
are: 
Height 3.5 in. (8.9 cm.) 
Width 8.8 in. (22.3 cm.) 
Length 9.0 in. (22.9 cm.) 
Weight 2.0 lb. (0.9 kg.) 
4.16 Each DSS/BLF Unit provides one-key access 
to up to 48 intercom numbers and up to 5 hunt group 
pilot numbers. The intercom numbers or hunt group 
pilot numbers accessed by the keys are programmed 
in the database on a system-wide basis. 
4.17 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-dis- 
turb, flashes fast when the station has a call ringing in, 
or flutters continuously if the station is causing a 
STATION OFF-HOOK system alarm. If assigned to 
a hunt group, the LED indicator is solidly lit when all 
stations in the hunt group are unavailable (busy, for- 
warded, in do-not-disturb, or removed from the hunt 
group) and it flashes fast when a call is camped on to a 
hunt group. 
C. SINGLE-LINE SETS 
NOTE: 
To install APMs for single-line set capability, 
an Extended MEM Board with 
Advanced software (part no. 662.2101) or an Extended MEM Board with 
Intermediate software (part no. 662.2103) is required. 
4.18 Up to 12 single-line sets maybe installed on the 
GMX-48 System. They can be Single-Line Instru- 
ments (SLIs) or industry-standard, single-line DTMF 
sets. See Figure 2-6 on page 2-2.5 for a drawing of the 
SLI. 
4.19 The dimensions of the SLI are: 
Height 3.5 in. (8.8 cm.) 
Width 7.5 in. (18.8 cm.) 
Length 9.0 in. (22.5 cm.) 
Weight 2.0 lb. (0.9 kg.) 
4.20 SLI design features include: 
Four user-programmable feature keys and a 
non-programmable timed hookflash (FLASH) 
key 
A ring volume thumbwheel control 
Hearing aid-compatible (HAC) handset (may be 
equipped with a handset amplifier as described on 
page 2-12) 
Reversible baseplate for wall mounting 
A ringer that can be set for AC or DC by moving a 
strap located on the control board 
4.21 Single-line set users access some station fea- 
tures simply by lifting the handset and pressing a fea- 
ture 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 
FEATURES section of this manual for details. 
4.22 If single-line sets are used as off-premises sta- 
tions, they must be equipped with AC ringers (SLIs 
have an internal strap that can be moved to set the 
ringer for AC or DC). When used on premises, 
single-line sets may have AC ringers by setting the 
APM circuit for AC ringing, or they may have DC 
ringers by setting the circuit for DC ringing. (Refer to 
page 3-46 for single-line set installation instructions.) 
Page 2-13  
						

							SPECIFICATIONS 
Issue 2, May 1990 ‘.. 
INTER-TEL PRACTICES 
GMX-48 INSTALLATION & MAINTENANCE 
D. OFF-PREMISES SINGLE-LINE STATIONS 
4.23 The 
off-premises station is an SLI or single- 
line DTMF set that is placed in a remote location and 
connected to the system through a telephone com- 
pany OPX line or a customer-provided line. 
4.24 The OPX lines provided by the telephone com- 
pany are identified with Facility Interface Codes 
(FIC): Class A, OL13& Class B, OL13B; or Class C, 
OL13C. The service order code is 9.OF (fully pro- 
tected private line). If the impedance does not exceed 
a loop measurement of 800 ohms (loop of 15,600 feet 
using 24AWG wire), a customer-provided line be- 
tween the remote location and the system may be 
used. 
4.25 The 800-ohm loop limitation is usually suitable 
for accessing on-premises stations from off-premises 
stations. However, for applications where one off- 
premises station will be calling another through the 
APM, the impedance between the two off-premises 
stations (both lines added together) must be less than 
800 ohms (loop measurement). In this situation, a 
Class A or B FIC line is preferable, since the APM 
does not amplify voice levels (or see paragraph 4.27 
for an alternate solution). 
4.26 Off-premises stations are connected to APMs 
(up to six circuits on a module). Additional equipment 
needed to install an off-premises station includes the 
following: 
One High Voltage Ringing Adapter (HVRA) Unit 
for every two off-premises stations. (Part number 
680.73.) 
A 48VDC power supply with a current rating of at 
least 200mA per HVRA Unit. 
A 11OVAC (30Hz) ring generator. Total the ringer 
equivalence numbers of the off-premises stations 
to determine the REN of the ring generator. For 
example, three single-line sets, each with a ringer 
equivalence of 0.9A, would require a 2.7REN minimum ring generator to ring all sets at once. 
Check the manufacturer’s specifications for the 
ringer equivalence of single-line sets used. SLIs 
have a ringer equivalence of 0.9A. 
One terminal block (66Ml-50 type) and a supply 
of bridging clips for each HVRA Unit. 
25pair cable to connect the HVRA Unit to the 
HVRA block. 
One 50-pin female amphenol-type connector for 
each HVRA Unit. Used to connect the cable to 
the HVRA Unit. 
Cross-connect cable to run from the HVRA block 
to the station block. 
1OAWG wire for grounding the power supply. 
Two screws for mounting the HVRA Unit to the 
MDF backboard. (Drilling may be necessary.) 
Cabling for customer-provided line, if used 
4.27 In certain off-premises applications, voice vol- 
ume levels may not be acceptable. This degradation in 
voice volume is due to the natural voice frequency 
range limitations of the telephone company or cus- 
tomer-provided line. To increase the frequency 
range, installation of a 2-wire, negative impedance 
repeater unit is recommended. Such units typically 
provide from O-15 decibels of voice volume gain and 
allow regulation of the gain in each direction when 
simultaneous voice transmission occurs. The switch- 
ing sensitivity on the unit should also be adjustable. 
4.28 The repeater unit is installed at the MDF be- 
tween the High Voltage Ringing Adapter (HVRA) 
Unit and the cabling to the off-premises single-line 
station. (Refer to page 3-18 for OPX installation in- 
structions.) When ordering a repeater unit, consult 
with the supplier for ordering the proper mounting 
shelf and power supply for the unit. Additional infor- 
mation on operating and adjusting the repeater unit is 
included with the product. 
Page 2-14  
						

							INTER-TEL PRACTICES 
GMX-48 INSTALLATION & MAINTENANCE ‘.. SPECIFICATIONS 
Issue 2, May 1990 
E. PLAYBACK DEVICES 
NOTE: To install APMs for playback device capabili- 
ty, an Extended MEM Board with Advanced software 
(part no. 662.2101) is required. 
4.29 A playback device is an answering machine 
that answers the call, plays a message, and then dis- 
connects from the call to transfer it to the appropriate 
destination. Playback devices are installed like single- 
line sets, using three-pair cable and six-conductor 
modular jacks (or, if desired, one-pair cable and four- 
conductor modular jacks). The device must be capa- 
ble of the following functions: detect ringing, provide 
ring trip, and automatically disconnect when the an- 
nouncement is completed. Because most playback 
devices respond to AC ring signals, they are attached 
to APM circuits that are set for AC ringing. If the playback device responds to DC ring signals, the 
APM circuit must be set for DC ringing. 
4.30 Hunt groups can have two special stations that 
help process calls: announcement stations and over- 
flow stations. These stations can be equipped with 
station instruments or with playback devices. (Play- 
back device capability is available only in the Ad- 
vanced software package. See FEATURES, page 
4-17, for more details.) Automated attendant stations 
- available only in the 
Advanced software package - 
can also be equipped with playback devices. (See 
FEATURES, page 4-14.) 
4.31 The playback device is programmed as a regu- 
lar single-line station and is assigned an intercom 
number. If the device is sensitive 
to camp-on tones, 
causing it to disconnect calls, the programmer can dis- 
allow the camp-on tone for that station circuit (refer 
to PROGRAMMING, page 5-49). 
Page 2-15  
						

							SPECIFICATIONS 
Issue 2, May 1990 ‘,. 
INTER-TEL PRACTICES 
GMX-48 INSTALLATION & MAINTENANCE 
5. OPTIONAL SYSTEM EQUIPMENT 
A. PROGRAMMING TERMINAL, SMDR/SAR 
OUTPUT DEVICE, AND REMOTE 
MAINTENANCE MODEM REQUIREMENTS 
5.1 The 
programming terminal and the output de- 
vices for the station message detail recording 
(SMDR) and system activity report (SAR) features 
must have the characteristics described in the follow- 
ing paragraphs. 
5.2 If using the port on the KCB, the terminal or 
output device must be RS-232-C compatible with a 
male 25pin subminiature “D” connector. Consult 
the owner’s guide for the device to verify that the pin 
functions are the same as those of the KCB (as shown 
below). If necessary, rewire the connector on the de- 
vice to match the requirements for the processor 
board. 
SIGNAL NAME 
Protective Ground 
Transmit Data (TXD) 
Receive Data (RXD) 
Request to Send @‘IS) 
Clear to Send (CDS) 
Data Set Ready (DSR) 
JYRECTION 
p@J 
Ground - tied to pin 7 1 
Data to KSU 
2 
Data from KSU 
3 
Signal to KSU 
4 
Signal from KSU 
5 
Signal from KSU 
6 
(always true*) 
Signal Ground 
Ground - tied to pin 1 7 
Data Carrier Detect (DCD) 
Signal from KSU 
8 
(always true’) 
*True = steady signal > + 5V 
NOTE: If using a Texas Instruments (TI) Silent 700 
programming terminal, the 25-pin connector that 
plugs into the KCB must be modified. Cut the wire 
going to pin number 8 and splice it to the wire going to 
pin number 20 (Data Terminal Ready - DTR). Pin 
number 8 will not have a connecting wire. Although 
the GMX-48 System does not use pin number 20, this 
procedure must be performed. 
5.3 If using the 52 (to DTE) port on the APM, the 
terminal or output device must be RS-232-C compat- 
ible with a male six-conductor RJ-11 connector and 
an inverting cable. Consult the owner’s guide for the 
device to verify that the pin functions are the same as 
those of the APM 52 port (as shown at the top of the 
next column). If necessary, rewire the connector on 
the device to match the requirements for the proces- 
sor board. 
SIGNAL NAME 
Request to Send (RTS) 
Signal Ground 
Transmit Data (TXD) 
Ready* 
Receive Data (RXD) 
Clear to Send (CTS) 
DIRECTION 
p!!q 
Signal to KSU . 1 Ground 
2 
Data to KSU 
3 
Signal from KSU 
4 
(always true) 
Data from KSU 
5 
Signal from KSU 
6 
*The “ready” signal (pin 4) is tied to the + 12V in the KSU and, if 
necessary, may be used to provide a constant (true) signal to the 
Data Set Ready (DSR) pin on the customer-provided device. 
5.4 If using the Jl (to DCE) port on the APM, the 
terminal or output device must be RS-232-C compat- 
ible with a male six-conductor RJ-11 connector and 
an inverting cable. Consult the owner’s guide for the 
device to verify that the pin functions are the same as 
those of the APM Jl port (as shown below). If neces- 
sary, rewire the connector on the device to match the 
requirements for the processor board. 
SIGNAL NAME 
Clear to Send (CTS) 
Signal Ground 
Receive Data (RXD) 
Ready* 
Transmit Data (TXD) 
Request to Send (RTS) 
DIRECTION 
!yfj 
Signal from KSU 
1 
Ground 
2 
Data from KSU 
3 
Signal from KSU 
4 
(always true) 
Data to KSU 
5 
Signal to KSU 
6 
‘The “ready” signal (pin 4) is tied to the + 12V in the KSU and, if 
necessary, may be used to provide a constant (true) signal to the 
Data Set Ready (DSR) pin on the customer-provided modem. 
5.5 When the system is initialized, the KCB and 
APM RS-232-C connectors are enabled for “soft- 
ware” handshaking. Most programming terminals 
and output devices are designed for software hand- 
shaking, 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 deter- 
mine if it uses X-ON/X-OFF characters. 
5.6 If the device does not support X-ON/X-OFF 
characters, hardware handshaking may be enabled 
(see PROGRAMMING, page 5-24). When enabled 
for hardware handshaking, signals are sent over the 
connector pins to indicate readiness to send or re- 
ceive data. The KCB port will send a logic true 
(> + 5V) on pin 5 (Clear to Send) while it is ready to 
receive data. If the buffer onthe KCB becomes full, a 
logic false (< -5V) will be sent. In addition, the KCB 
will monitor pin 4 (Request to Send). The KCB will 
only send data if it receives a logic true ( > + 5V) over 
pin 4. If the KCB receives a logic false (< -5V) to 
Page 2-16