Toshiba Strata Xiie, Strata Xxe Electronic Key Telephone Systems Installation And Maintenance Manual

							GENERAL DESCRIPTION 
SECTION 300-020-l 00 
JULY 1986 
TABLE B 
STANDARD FEATURES (continued) 
STATION 
l Automatic Dialing-Station 
e Automatic Line Preference 
0 Call Forward (Intercom) 
l Direct Station Selection (DSS Key) 
l Do Not Disturb 
l Do Not Disturb Override 
l DP/MF Mode Change (Tone Key) 
l Exclusive Hold 
l Executive Override (Break-In) 
l Forced Account Code 
l Handsfree Answerback 0 I-called Illumination 
e I-hold Illumination 
0 l-use Illumination 
0 Modular Handset and Line Cords 
l On-hook Dialing 
l Push-button Dialing 
@ Ringing Line Preference 
a Saved Number Redial 
l Station Security (MC0 Key) 
0 Station-to-Station Message Waiting with 
LCD 
TABLE C 
OPTiONAL FEATURES 
l Background Music with Station Control 
l Direct Station Selection (DSS) Console 
* All Call Voice Page 
0 Automatic Line Hold 
l Expanded Line Appearance 
e Multiple DSS Consoles 
l Night Transfer 
* Voice or Tone Signalling 
l Door Phone/Monitor Stations 
l Alarm Key 
l Door Lock Key 
l EKT Faceplates (black, blue, wine) * External Page Amplifier 
0 MOH Source 
0 Off-Premise Extension (OPX) 
l Ring Generator Power Supply (MRGU) 
l Off-Premise Line (OPL) 
@ Station Message Detail Recording (SMDR) 
l System Battery Back-up 
l IO-key EKT (HFU or speakerphone) 
e IO-key Busy Lamp Field (BLF) EKT 
0 20-key EKT (HFU or speakerphone) 
@ 20-key Liquid Crystal Display (LCD) EKT 
e TIE Lines 
05 SYSTEM OPERATION 
05.00 General 
05.01 The system (Figure 10) consists of an 
HKSU and up to 32 
(Strata X//I) or 56 
(Strata XX&) stations, up to three door 
phones, and up to four option modules (HOLB, 
HOXB, HSMB and HTIB). All connections be- 
tween the HKSU and EKTs are made via a cus- 
tomer-provided main distribution frame (MDF). 
Using modular line cords, the CO lines are 
connected between the HCOU PCBs and 
locally provided RJ-25C jacks. An external 
tuner (or equivalent) or an optional synthesized 
music PCB (SMOU) is required for music-on- 
hold. Background music requires an external 
music source (can be the same tuner used for 
music-on-hold). 05.02 Functional block diagrams of the sys- 
tems are shown in Figures 11 
(Strata 
X/Ie) and 12 (Strata XX&). The systems, 
which are nearly identical, consist of: station 
interfaces, including the solid-state switching 
matrix (HSTU/STAU); CO/PBX line interface 
(HCOU); HOLB/HTIB interface (HPLU); inter- 
com, paging and miscellaneous circuits (HINU); 
common control processor and memory with 
SMDR interface (HCAlJ/CAAU); and the sta- 
tion control and DSS interface (HCBU). 
Strata X& uses two HCBUs if more than 
32 stations or any BLF DSS consoles are de- 
sired. Strata X& uses only one HCBU. 
The following option modules are also avail- 
able: HOXB for the off-premise extensions 
(OPX); HOLB for the off-premise line (OPL) 
interface; HSMB for the SMDR interface; and 
HTIB for the TIE line interface. 
-7-  
						

							GENERAL DESCRIPTION 
SECTION 300-020-l 00 
JULY 1986 
HKSU (Strata Xrr, & XX,) 
TOCO 4 
Door 
Phone 
2-PAIR 
I 25 
CI 115VAC 
EXTERNAL 
SPEAKER 
FIGURE IQ - SYSTEM DIAGRAM 
05.03 Each system is controlled by a micro- 
Figures 3 and 4 (Strata X/fe & XXe, 
processor, located (along with the system pro- 
respectively) show the locations of the various 
gram and data memories) on the HCAU/CAAU 
PCBs 
and power supply. All PCBs slide in from 
PCBs. A second microprocessor on the HCBU 
the front of the cabinet and, although the rear 
exchanges data with the other PCBs. 
panel of the HKSU is removable, rear access is 
06 SYSTEM CONFIGURATION usually not required. 
06.00 Key Service Units 
06.01 
The HKSU arrangements illustrated in 06.02 A complete Strata system utilizes 
a power supply module, seven different printed 
circuit boards and various option modules. The  
						

							GENERAL DESCRIPTION 
SECTION 300-020-l 00 
JULY 1986 
oar Phone/Monitor Station 
I 
I HKSU 
1 EKT 
l---EC 
-- 
HCDU #l l-3 
.* I 1 1 
XP 
I I 
AD10 
CONTRO- 
HCBU #l $ DATA 
, HbTU #4 
10-12 
-a I 4 1 
HPSU 
DSS’wli 
CONSOLE 
I 
FiGURE 11 - Strata XIpe FUNCTIONAL BLOCK DIAGRAM 
functions are as follows: 
HPSU 8120: This is the system power sup- 
ply, which provides 24 VDC operating volt- 
age for Strata X/la and connects to a 
117 VAC, 60-Hz wall outlet. 
HPSU 9120: This power supply provides the 
24 VDC operating voltage for the Strata 
J-G. 
HPBU-8: The same optional battery back-up 
unit is available for either power supply. It is 
a PCB that mounts onto the power supply housing and is connected to the recom- 
mended battery pack (which is customer- 
supplied, consisting of two 12 VDC, mainte- 
nance-free, automobile-type batteries - 80 
amp/hour maximum rating). With the op- 
tional battery back-up assembly installed, all 
functions of the Strata system will con- 
tinue to operate for several hours (the actual 
time period is in direct ratio to the type and 
size of batteries selected) after a loss of nor- 
mal electrical power. No calls will be dis- 
connected during switch-over to or from 
bat- 
tery power. 
-9-  
						

							GENERAL DESCRIPTION 
SECTION 300-020-l 00 
JULY 1986 
oar Phone/Monitor Station 
El HOLB 
HCOU #l l-3 
t 
1 
HCOU #7 19-21 
HPSU I 
9120 
1 
+24V I-1 1 CO/PBX 
LINES 
AC 115V 
FIGURE 12 - Strata Xx,FUNCTlONAL BLOCK DIAGRAM 
HCOU: 
An interface between the HKSU and would usually serve these lines. 
Central Office or PBX lines. Ring detection, 
hold and dial outpulsing are performed by 
HSTU/STAU: An interface between the 
this PCB. Depending upon local CO require- HKSU and EKTs, which includes the sys- 
ments, each CO/PBX line can be program- tern’s solid-state space division matrix. Each 
med for DTMF or rotary dial outpulsing. HSTU/STAU PCB services up to eight EKTs. 
Each HCOU PCB serves up to three CO/PBX Two-pair wiring is required for each EKT; 
lines. one pair carrying voice and the other pair 
carrying control data to and from the EKT. 
HPLU: An optional PCB that is required . STAU: Contains the additional solid- 
when using optional HOLB or HTIB modules. state crosspoints required in a 
Strata 
Each HPLU PCB interfaces one HOLB or XG. Each STAU PCB mounts directly 
HTIB module. The HPLU serves up to three on the HSTU, providing access to 
CO ._ 
CO/PBX lines and replaces the HCOU that lines 13 - 21, plus two additional inter- 
1ST CARD MUST GO IN SLOT 4 AND 2ND CARD NEED 1 STAU ON EACH HSTU FOR THE 1ST 
IN SLOT 5 
-1 o- 12 CO LINES OR THE NEW HSTU-2 CARD WHICH 
INCORPORATES THE STAU WITHIN THE CARD. 
TFE ZND STAU MOLVTS ON CARD FOR LINES  
						

							GENEWAL DESCRIPTIBN 
SECTION 300-020-l 00 
JULY 1986 
. corn paths for those eight stations. 
HCAU/CAAU: The CAAU is required and 
mounts directly on the HCAU to form a sin- 
gle unit. All system control functions are 
performed by the single-chip microprocessor 
located on the HCAU. The system program 
stored in ROM, the RAM for system opera- 
tions and the battery-protected RAM for 
system data storage are located on the 
CAAU. 
HCBU: Contains a microprocessor and 
serves to off-load the main CPU by handling 
the routine and repetitive data transmission 
tasks to and from the peripheral equipment. 
It also provides the interface for two DSS 
consoles. One HCBU is used in Strata 
x43, while two are required in any 
Strata XX& system that is equipped 
with more than 32 stations or that requires 
one or two BLF consoles. BLF consoles are 
not available for the Strata Xl/& 
HINU: Generates system tones and provides 
the switching matrix for the delivery of 
tones for both paging and intercom connec- 
tions (one per system). Houses circuitry and 
connection points for the relay services, 
music-on-hold (MOH), and the external page 
amplifier. Also is a host PC8 for the SMOU. 
@ 
SMOU: The SMOU is an optional 
music-on-hold source that provides 
electronic synthesized music. One of two 
musical tunes are available, selected via 
a switch on this PCB. 
06.10 Option Modules 
HOLB: 
An off-premise line module that 
allows the bridging of a CO/PBX line, which 
appears in the system, with a conventional 
telephone &pervision is provided). Each 
HOLB provides three circuits, all three of 
which may be directed to an answering 
machine (or similar device) attached to the 
HUNT connector. Requires a connection to 
an HPLU PCB (that has been installed 
instead of an HCOU) for each HOLB module 
desired. 
HOXB: An optional module that serves as an 
interface between the HKSU and conven- 
tional, single-line telephones or off-premise 
extension (OPX) iines. Each HOXB module 
services two extensions. A maximum of two 
HOXBs can be installed in Strata Xl& and three in Strata X&.-An HOXB will 
operate with either DTMF or rotary dial tele- 
phones. An auxiliary power/ringing supply 
(MRGU) is required for the HOXB. 
HSMB: Serves as an interface between the 
HKSU and a printer or storage device used 
for the SMDR feature. The module is 
equipped with an RS-232C interface for the 
printer connection and connects to the 
HCAWCAAU via two supplied &wire modu- 
lar connectors (one per system). 
HTIB: This is a TIE line module that allows 
connection to E & M TIE lines (2-wire). Each 
HTIB provides two TIE line circuits, and 
requires an HPLU .PCB to be installed 
instead of an HCOU. Only one HTIB module 
may be installed in Strata Xl/e and two 
in Strata X&. Each TIE line installed 
reduces the available OPX ports by two. 
06.20 Station Equipment 
06.21 
Electronic Key Telephone features in- 
clude full speakerphone or handsfree answer- 
back only capability, and modular handset and 
line cords. 
06.22 The principal components of the EKT 
are: handset, dial pad, speaker, ringing volume 
control, speakerphone volume control, four 
fixed feature keys, and 10 or 20 flexible 
CO/PBX/feature keys. LED i sa 
vided for all keys except the nd 
keys. See Figures 13 and 14. 
FIGURE 4 3 - 1 O-key EKT  
						

							GENERAL DESCRIPTION 
SECTION 300-020-l 00 
JULY 1986 
FIGURE 14 - 20-key EKT 
06.23 The lo-key Busy Lamp Field (BLF) EKT 
(Figure 15) with speakerphone may be as- 
signed at any one of up to 16 positions (sta- 
tions 10 - 25 only), and will indicate which of 
those stations are in a busy or DND condition. 
FIGURE 15 - IO-key BLF EKT 
06.24 A 20-key Liquid Crystal Display (LCD) 
EKT (Figure 16) with speakerphone may be 
located at any or all stations in either system. 
The 32-character alphanumeric display pro- 
vides an accurate clock/calendar in the idle 
state; or elapsed time, dialed number, calling 
station, CO line and other feature activation prompts are displayed depending upon use. 
System messages, personal messaging, and 
station-to-station messaging are also included. 
FIGURE 16 - 20-key LCD EKT 
06.25 All EKTs feature modular handset 
cords and are also equipped with a second 
modular connector for headset connection. 
06.26 A!I EKTs are connected to the system 
via 4-conductor modular line cords and are 
easily converted for wall mounting. 
06.27 The optional door phone/monitor sta- 
tion (Figure 17) allows a door phone unit to 
distinctively ring pre-selected station(s). When 
a station dials an individual door phone, a cir- 
cuit providing monitoring capabilities on inter- 
com is established. This option requires station 
13 or 14 to be replaced by a door phone con- 
trol unit (HDCB) and up to three door phone 
units (MDFBs). 
06.28 An optional Direct Station Selection 
(DSS) console (Figure 18) is available for both 
systems where the volume of incoming calls 
warrants a dedicated call forwarding location. 
The attendant’s EKT key configuration varies 
from the standard EKT only in different dedi- 
cated key functions and lacks an intercom key 
(it is on the DSS). The DSS is equipped with up 
to 56 station keys, an intercom key, an All Call 
Page key, Message Waiting/Flash key and a 
Night Transfer key. Either system may be 
equipped with one or two fully functional DSS 
consoles.  
						

							GENERAL DESCRIPBIDM 
SECTION 300-020-l 00 
JULY 1986 
FIGURE 17 - DOOR PHONE 
FIGURE 18 - 
DSS CONSOLE 
06.29 In the Strata X& only, one or 
two DSS consoles may be optionally added as 
BLF consoles. Their only function is to provide 
station status information using the LEDs. The 
DSS keys do not function when the DSS con- 
sole is used as a BLF console. 
06.30 Installation 
06.31 The Strata HKSUs are arranged at 
the factory for table-top mounting, but can also 
be wall mounted. 06.32 All connections to HKSUs are made 
via the various printed circuit boards as fol- 
lows: 
0 CO/PBX line connections are made to the 
front of each HCOU using one 3-pair modu- 
lar cord for each PCB. 
@ Each group of eight EKTs is connected to 
the front of each HSTU with one standard 
50-pin amphenol-type connector. 
l DSS connections are made to the front of 
the HCBU PCB with one 2-pair modular 
cord for each DSS. 
l Screw-terminal barrier strips are mounted 
on the front of the HINU to provide attach- 
ment points for the following connections: 
6 Music-on-hold source input 
@ External page output 
* Night relay service 
0 External page relay service 
9 The HSMB option module used for SMDR is 
connected to the front of the HCAWCAAU 
via two supplied 8-wire modular connec- 
tors. An RS-232C plug is provided on the 
HSMB for connecting the SMDR printer or 
data collecting device. 
l Connections for OPX lines, external DC, 
and ringing power are made to the HOXB 
using screw-terminal barrier strips. 
l OPL connections are made on the HOLB via 
6- or 8-wire modular cords to the front of 
the HPLU. Two cords are required; one cord 
is connected to the CO jack and serves up 
to three CO/PBX line connections, as with 
an HCOU (the HPLU occupies an HCOU PC8 
position), thec8-wire cord connects to the 
OPL jack and serves the three OPL stations 
provided by the PCB. 
06.40 Maintenance 
06.41 Faults in both Strata systems are 
repaired by replacing any faulty component 
(PCB, sub-assembly, telephone, etc.) and re- 
turning it to the manufacturer for repair. 
07 FEATURES and OPERATION 
07.00 General 
07.01 This section contains brief descrip- 
tions of the Strata features listed earlier in 
-13-  
						

							GENERAL DESCRIPTION 
SECTION 300-020-100 
JULY1986 
Tables B and C and some associated operating 
instructions. Detailed operating instructions 
can be found in the Strata X/l= & XX& 
EKT USER GUIDE or the installation and 
Maintenance manual (Section 300-020-400, 
Operating Procedures). 
07.10 Standard Features 
07.11 System 
AH Call Voice Page: Dialing a 2-digit access 
code permits a station user to page via all 
EKT speakers simultaneously. The system 
C?T: also be programmed to include the 
External Page feature in an All Call Page. 
Alphanumeric Messaging with LCD: Allows 
system and personal messages to be dis- 
played on the 32-character LCD key. Mes- 
sages may be up to 16 characters in length 
and are entered/changed via the station dial 
pad. A station enters one of 10 access codes 
that contain a system message. The station 
can personalize the message and then dis- 
play it for any calling station. 
Automatic Callback (Intercom): Permits a 
station user who encounters a busy station 
on intercom to request a callback by dialing 
a dedicated access code. The system then 
monitors the called station and signals the 
caller when that station becomes idle. 
Automatic Dialing-System: This standard 
feature allows 40 numbers to be stored in 
the system memory. After selecting an out- 
going line, any station user can cause one of 
the stored numbers to be outpulsed by 
dialing the proper address code. 
Automatic Hold Recall: A CO line placed on 
hold by any station will recall that station 
after a programmable period of time. A dif- 
ferent time period can be selected for each 
station. 
Automatic Release from Hold: The system 
automatically releases held CO lines if a dis- 
connect signal is received from the central 
office. 
Busy Override: After dialing a busy station 
and receiving a busy tone, the caller can dial 
a B and cause a tone burst to be sounded via 
the called EKT speaker. 
Call Transfer with Camp-on: Allows the transfer of an outside call to a station that 
can be either idle or busy. 
CO Call Pick-up: Using a dial code, allows 
CO call pick-up from another station. 
Conference (Amplified): A programmable 
feature that allows customer-supplied amp- 
lifiers to be used during a conference involv- 
ing CO lines. The system automatically acti- 
vates the amplifier upon establishing con- 
ferencing. This feature reduces the system 
total capacity by two EKTs. 
Conference (Multi-station): Non-amplified 
conferencing is permitted to a maximum of 
four stations and one CO or intercom line. 
Conference (Multi-trunk): Non-amplified 
conferencing of two CO lines and up to 
three stations is permitted. 
Directed Call Pick-up: Intercom calls can be 
answered from any station by going 
off-hook, depressing the m key and dialing 
0 B and then the number of the ringing sta- 
tion, or 11 if the ringing station’s number is 
not known. 
Distinctive Ringing: CO line and intercom 
calls are distinguished by different ringing 
tones. 
DTMF and Dial Pulse Compatible: DTMF or 
rotary dial pulse signalling can be sent to 
the CO/PBX line by system programming. 
External Page Interface: Dialing a 2-digit 
code permits a station user access to a cus- 
tomer-provided external speaker via an 
internal 3-watt amplifier. As an option, a 
2-way, 600-ohm voice path is available for 
use with a customer-supplied talkback spea- 
ker/amplifier. 
Flash Kev fPBX Transfer or CO Dial 
Tone 
Recall); ‘All EKTs are 
sage Waiting/Flash 
when operated while connected to a 
CO/PBX line, causes a timed “flash” to be 
transmitted to the CO or PBX. The timing of 
the flash can be programmed to signal a 
PBX for feature operation or can be long 
enough to cause a disconnect and dial tone 
on a CO line. Also see Message Waiting. 
Flexible Key Assignment: Allows each EKT 
to be programmed for optimum use of its 
-14-  
						

							CO/PBX or feature keys. 
Flexible Line Ringing Assignment: A pro- 
grammable ring or no ring option is provided 
for each line selectively by each station. 
Each line may be programmed to ring a 
maximum of eight stations. 
Group Paging: Special 2-digit access codes 
(81, 82, 83 or 84) permit voice paging to one 
of four zones. Zone assignment is via soft- 
ware and is totally flexible. Paging is via the 
speakers of idle EKTs. 
Live System Programming: Live system pro- 
gramming is accomplished without service 
interruption to other station users by placing 
the system in the special programming 
mode and inputting data via station 17. Sta- 
tion 17 is the only station that is “down” 
during programming. 
Message Waiting: The designated Message 
Center can indicate a message is waiting for 
any station with the Message Waiting LED 
of that station. The called station cancels 
the LED by depressing the key. Also 
see Flash Key and Station-to-Station Mes- 
sage Waiting with LCD. 
MF Signal Time (160/80 ms): The standard 
MF dial signal time is 80 ms, but it may be 
extended to 160 ms, if required. 
Multiple Simultaneous Handsfree Intercom 
Paths: Four intercom paths are available 
in a 
Strata XpIe system and up to six 
paths in a 
Strata XX&. All intercom 
lines are able to carry handsfree conversa- 
tion simultaneously. 
Music-on-hold Interface: An interface is 
included for a customer-provided music 
source. CO lines placed on hold will be con- 
nected to this source. In addition, this music 
may also be broadcast from EKT speakers 
and external page when the background 
music options are selected. 
Night Ring Answer Code: A night ringing 
call may be answered from any station via 
an access code. 
Night Ringing Over External Page: As a 
programmable option, while the NITE mode 
is active, a system-generated ring tone will 
be transmitted via the external speaker GENERAL DESCRIPTION 
SECTION 300-020-l 00 
JULY 1986 
whenever any line rings. Also see Tenant 
Service. 
Night Transfer: On a programmable optional 
basis, the 
Strata systems can function 
with two or three ringing patterns. If the 
three-pattern mode is selected, the patterns 
are designated DAY, DAY 2, and NITE. If the 
two-pattern mode is selected, DAY and NITE 
designations are used. In both cases, the 
ringing mode is selected with the m key on 
either the DSS console(s) or station 10. Also 
see Tenant Service. 
Non-blocking Dialing: Dialing is permitted 
on intercom and all CO lines simultane- 
ously. 
Outgoing Call Restriction: Any station can 
be selectively restricted from originating 
calls on any or all CO lines. However, the 
station may still receive calls on the 
restricted line(s). 
PBX Compatible: 
Strata features, such 
as toll restriction and automatic dialing, are 
compatible with PBX operation. 
Privacy/Non-Privacy: A private system pre- 
vents other stations from accessing the 
intercom or CO lines that are already in use. 
A non-private system provides conferencing 
on the CO and intercom lines. 
Private CO Lines: Restrictions may be pro- 
grammed into the system so that selected 
CO line(s) will appear only on selected sta- 
tion(s). 
Relay Service: The HINU PCB is equipped 
with two relays that provide the following 
signals for external equipment: 
a) External Page: The relay is activated 
whenever the external page circuit is 
accessed. A dry “make” contact is provided 
for control of background music on external 
page. This is required only when an external 
page amplifier is used. 
b) Night Relay Service: The relay pro- 
vides a dry contact at the NR terminals on 
the front of the HINU PCB. A strap option on 
the HINU allows the NR relay to function in 
one of two modes: 
1) Answering Machine Control: If the 
-15-  
						

							GENERALDESCRIPTION 
SECTIDN 300-020-100 
JULY1986 
strap remains intact, the relay is operated 
continuously when the system is in night 
service. This mode is intended for indirect 
control of an answering machine. 
2) Night Bell Control: If the strap is cut, 
the relay pulses at a 1 -second on/3-sec- 
onds off rate whenever the system is in 
night transfer mode and an incoming call 
is ringing the system. This mode is in- 
tended to be used for indirect control of 
an external night bell. 
Repeat Last Number Dialed:. The iast num- 
ber dialed by each station is always stored 
by the system and will be dialed automati- 
cally whenever the station user selects an 
outgoing line and depresses the 1 key. Also 
see Saved Number Redial. 
Station Hunting: Hunting always starts with 
the called station number and ends with the 
last station number in the prearranged 
group; however, the call is completed to the 
first idle number. The hunting sequence can 
be either consecutive or nonconsecutive. 
Store Flash Using Automatic Dialing: Al- 
lows storing a “flash” in an automatic dial- Wall Mountable HKSlJ: The HKSU is also 
ing number via m or m keys. designed for wall mounting. 
Tenant Service: Variable CO/PBX line key 
assignments allow two tenants to be served 
from the same HKSU with each tenant’s 
lines appearing in the correct sequence. 
When Tenant Service is used, Night Ringing 
Over External Page will apply to lines 
assigned to Tenant #l only. Also, Night 
Transfer of Ringing for Tenant #l and 
Tenant #2 lines will be independently con- 
trolled by DSS #l (station 10) and DSS ##2 
(station 1 1 ), respectively. 
Toll Restriction (6-digit): Selectively pro- 
grammed on a per-station, per-line basis, 
the Strata systems perform toll restric- 
tion by analyzing the first 6 or 3 digits (area/ 
office code) dialed. Simple restriction by re- 
jecting the numbers m and a can be pro- 
grammed on a per-station basis, if desired. 
Toll Restriction Override Code: Two special 
codes may be defined to override toll restric- 
tion. 
Toll Restriction Override by System Auto- 
matic Dialing: 
A programmable system feature that permits numbers stored in 
Automatic Dialing addresses 60 - 99 to be 
called by toll-restricted stations. 
Trunk Queuing: Provides a means for station 
users to be “stacked” in a waiting queue for 
a busy outgoing trunk group. The station will 
then be called back when a trunk in the 
group becomes available. As a program- 
mable option, the system may be equipped 
with one trunk group (dial 9) or four trunk 
groups (dial 91,92, 93, 94). 
Trunk-to-Trunk Connection (Tandem 
Switching). Allows the system to set up a 
CO line-to-CO line connection, leaving the 
controlling station free to make other calls. 
A maximum of six (simultaneous) trunk-to- 
trunk circuit paths can be established. Each 
path reduces system capacity by one EKT. 
Voice or Tone Signalling: A programmable 
system feature that optionally selects either 
tone ringing or voice page as the primary 
method of intercom call signalling. The 
alternate method is selected by dialing 0 fol- 
lowing the station number. 
07.12 Station 
. 
Automatic Dialing-Station: Provides a pri- 
vate automatic dialing list of 40 numbers for 
each station in the system. 
Automatic Line Preference: Allows CO/PBX 
line access by merely lifting the handset; 
depressing a CO key is not required. 
Call Forward (Intercom): Allows 
a// calls 
destined for a station to be routed to another 
station (activating station may be used to 
originate calls while feature is activated). 
Direct Station Selection (m: By depress- 
ing an assigned key, a station user causes 
the selected EKT to ring. A maximum of two 
DSS keys may be assigned per EKT. 
Do Not Disturb: This feature is activated 
and deactivated by alternate depressions of 
the m key. A station calling a station that 
is in the DND mode will receive a fast busy 
tone. 
Do Not Disturb Override: After reaching a