Toshiba Strata Dk24, Dk56, Dk96 Instruction Manual

							FIGURE ‘I-7-ELECTRONIC TELEPHONE WALL 
MOUNTING BASE ROTATION 
3.20 Standard Telephone Connections 
3.21 Standard telephones areconnected to PSTU 
or PESU (via the MDF) with standard twisted-pair 
jacketed telephone cable. Single-pair wiring is 
required for telephone connection (refer to Wiring 
Diagrams, Section 200-096-209, for wiring/inter- 
connecting details). 
I NOTE: 
See Section 200-096-209 for secondarypro- 
tector information. 
3.22 The standard telephone cable’s overall loop 
resistance, connected on- or off-premises, is 300 
ohms maximum, including the telephone resis- 
tance. This also applies to all devices connected to 
PESU or PSTU standard telephone circuits. 
3.23 Astandard telephone connected off-premises 
via the telephone network should interface with 
INSTALLATION-TELEPHONE 
SECTION 200-096-207 
FEBRUARY 1991 
OL13A lines (or equivalent) and connect to an 
RJ21 X FIC jack (or equivalent). _ 
3.30 DSS Console Connections 
3.31 DSS consoles must be located adjacent to 
an electronic telephone (preferably an LCD model). 
DSS consoles are connected to the PEKU (via the 
MDF) using standard 2-pair, twisted pair, jacketed 
telephone cable. To connect the console use only 
the data pair of circuits 7 and 8. To accommodate 
the DSS console connection, the instrument end of 
the cable should be terminated in a modular sta- 
tion connector block (RJ-11). Refer to Wiring Dia- 
grams, Section 200-096-209, for wiring/intercon- 
necting details. 
3.32 The overall length of the DSS console cable 
run from the KSU to the console must not exceed 
500 feet (152 M), if using 24 AWG cable. 
CAUTION! 
When installing the DSS console cable, do 
not run parallel to and within 3 feet of an 
AC power line. AC power lines should be 
crossed at right (90”) angles only. Avoid 
running DSS console wire pairs near de- 
vices that generate electrical noise, such 
as neon or fluorescent light fixtures. 
3.33 DSS Console Configuration 
3.34 The following considerations should be made 
when installing DSS consoles: 
l A PEKU PCB is required to use the DSS console. 
(The DSS switch on the PEKU must be set to 
DSS.) 
l PESU does not support DSS consoles. 
l A maximum of four DSS consoles are allowed 
per system (three in a DK24 if a PCTUS is used). 
l Two PEKU ports are required for each DSS 
console (always circuits 7 and 8). 
l Only one DSS console may be connected to a 
PEKU. 
3.35 DSS Programming Overview 
Program 28 I 
l Assigns DSS console(s) to electronic tele- 
phones. 
7-5  
						

							INSTALLATION-TELEPHONE 
SECTION 200-096-207 
FEBRUARY1991 
Program 29 
l Assigns DSS console’s individual button func- 
tions. 
3.40 HDCB Door Phone/Lock Control Box In- 
stallation 
3.41 
The HDCB Door Phone Control Box sup- 
ports three door phones (MDFB), or two door 
phones and one door lock control. Wiring connec- 
tions for the HDCB are the same as for an elec- 
tronic telephone. 
3.42 The overall combined length of the HDCB 
and MDFB cable run from the KSU to the tele- 
phone must not exceed 1,000 feet (305 M), if 
using 24 AWG cable. 
CA UT/ON! 
When installing the HDCB or MDFB cable, 
do not run parallel to and within 3 feet of 
an ACpower line. AC power lines should 
be crossed at right (90”) angles only. 
A void running the HDCB/MDFB wire pairs 
near devices that generate electrical 
noise, such as neon or fluorescent light 
fixtures. 
3.43 Refer to Wiring Diagrams, Section 200-096- 
209, for wiring/interconnecting details. The fol- 
lowing considerations should be made when in- 
stalling door phones: 
l A maximum of four HDCBs are allowed per 
I system with PCTU(l, 2, or 3); three HDCBs are 
allowed with PCTUS. 
l One electronic telephone (PEKU or PESU) port 
(always the 5th circuit port) is required for each 
HDCB. 
l HDCBs can only be connected to PEKU or 
PESU port numbers 04, 12, 20, and 28. 
l Only one HDCB may be connected to a PEKU 
or PESU. 
l Cut jumper W9 on any PEKU/PESU PCB which 
will support an HDCB. 
I NOTE: 
PDKUs do not support HDCBs. 
TWO WALL 
MOUNTING 
HOLES 
DOOR PHONE 
FlGURE7-8-OOORPHONElNSTALLATlON 
3.44 Door Phone/Lock Programming Consid- 
erations 
Program 03 
l PEKU or PESU slotssupporting door phonesdo 
not require a special PCB code. 
Program 77-1 
l Assigns HDCB port numbers and Night Ringing 
over External Page. 
Program 77-2 
l Busy-out unused MDFB positions; identify which 
HDCBs support the Door Lock option. 
Program 39 
l Assigns the m N m buttons to elec- 
tronic and digital telelphones. 
I 
3.50 Door Phone Installation 
3.51 
Mount door phones (MDFBs) to a wall or 
vertical surface in accordance with the following 
steps (Figure 7-8): 
I -: 
7-6  
						

							INSTALLATION-TELEPHONE 
SECTION 200-096-207 
FEBRUARY1991 
1) Remove the screw from the bottom of the 
cover. Detach the cover from the base and 
metal frame. 
2) Position the metal frame and base to the 
mounting surface and secure with two 1 -inch 
pan head wood screws. 
3) Attach cover to the metal frame and base. 
4 DIGITAL TELEPHONE 
UPGRADE OPTIONS 
4.00 The following contains digital telephone in- 
stallation instructions. It includes step-by-step di- 
rections and drawings on how to upgrade digital 
telephones to transmit and receive simultaneous 
voice and data calls. Instructions are also provided 
for the loud ringing bell/headset and off-hook call 
announce upgrades. 
4.01 Simultaneous Voice and Data (Integrated 
Datalnterface Unit: PDIU-DI) Upgrade. 
PDIU-DI- 
equipped digital telephones can transmit and re- 
ceive simultaneous voice and data calls made 
independently of each other. Asynchronous de- 
vices, such as personal computers and terminals, 
can be connected to the standard RS-232 connec- 
tor of the PDIU-DI. Station users are able to 
transmit and receive RS-232 data over the PDIU- 
DI equipped telephone’s single twisted wire pair. 
4.02 Data calls can be manually dialed with a 
m button and disconnected with am but- 
ton (see 
Program 39); or, if the PDIU-DI equipped 
digital telephone is connected to a personal com- 
puter or ASCII terminal, standard “AT” dialing 
commands may be dialed from the terminal’s or 
computer’s keyboard to place data or voice calls. 
PDIU-DI equipped digital telephones may also be 
assigned a m button 
(see Program 39) to 
reserve a modem or monitor modem availability 
and status. 
NOTES: 
I. If the digital telephone is equipped with a 
PDIU-DI, it cannot be wall-mounted or 
upgraded for loud ringing bell/headset or 
off-hook call announce. 2. The PDIU-DI will function in all systems, 
except for slots 7 I - 14 in DK96.. 
3. The PDIU-DI can be connected to any digital 
telephone connected to PDKU circuits 1 w 7. 
4.03 Loud Ringing Bell/Headset. The loud ring- 
ing bell/headset upgrade (HHEU) enables an 
external speaker (HESB) and/or a headset to be 
connected to the digital telephone. In this configu- 
ration, the HESB serves as a loud ringing bell. 
NOTE: 
A Toshiba HESC-65A cable is required to 
connect the HHEU in a digital telephone to 
the HESB. The HHEU must be version V3.0 
or later for HESB operation (not required for 
headset operation). 
4.04 Off-hook Call Announce (DVSU). The off- 
hookcall announce (OCA) upgrade allows a digital 
telephone to receive calls when the handset is off- 
hook. To receive OCA calls, a digital telephone 
must be upgraded with a DVSU; the telephone 
making the call does not require a DVSU. (The 
DVSU’s function in the digital telephone is the 
same as the HVSU/HVSI assembly’s function in 
the electronic telephone.) An additional wire pair is 
not required for digital telephones that receive 
OCA calls. 
NOTE: 
The HHEU must be version V3.0 or later for 
digital telephones supporting both the loud 
ringing bell/ headset and OCA upgrades. 
4.10 Digital Telephone Upgrade Installation 
4.11 PDIU-DI Installation. 
Install the PDIU-DI in 
accordance with the following steps: 
1) Loosen the four captive screws securing the 
digital telephone base, and remove it. 
2) Refer to Figure 7-9, and insert the two PDIU- 
DI wire connectors into the digital telephone’s 
bottom PCB, observing the red wire for cor- 
rect positioning. 
3) On the digital telephone cut the DIU strap: 
W302 on DKT 1020H or 
-W401 on DKT 
1020SD (see Figure 7-9). 
7-7  
						

							INSTALLATION-TELEPHONE 
SECTION 200-096-207 
FEBRUARY1991 
TOP ASSEMBLY 
RS-232 (FEMALE) 
DE-25 CONNECTOR 
/ 
-/ TO P2 OF 
BOTTOM 
PC6 
IMPORTANT: DO NOT CONNECT DIU 
CABLES TO HHEU CONNECTOR 
-.- -. DIGITAL TELEPHONE BASE 
FlGURE7-9-PDIU-DI/DIGITALTELEPHONElNSTALLATlON 
NOTE: 
The DIU strap must be replaced if the PDIU- 
DI is removed from the telephone. 
4) Attach the PDIU-DI to the bottom of thedigital 
telephone and secure with the four captive 
screws (Figure 7-l). 
5) Remove the telephone number directory tray 
from the original telephone base and install it 
on the PDIU-DI telephone base (Figure 7-9). 
Bend tray by squeezing its sides so it bows 
slightly to remove and reinstall. 
NOTES: 
1. The PDIU-DI and accompanying digital 
telephone share the same wire pair and 
PDKU port. 
2. To install data devices to the PDIU-DI, 
RS-232 connector, see Chapter 8, PDIU- 
DI/PDIU-DS Data Device Installation. 
4.12 PDIU-DI Programming Overview 
Program 03 
l No special code required. Program 39 
l Assigns them, m, andmra buttons. 
Programs 20 and 22 
l PDIU configuration. 
4.13 HHEU Upgrade Installation. Install the loud 
ringing bell/headset (HHEU) upgrade in accor- 
dance with the following steps: 
NOTE: 
The HHEU installed in a digital telephone 
must be V.3 or greater. 
1) Loosen the four captive screws securing the 
telephone base (Figure 7-l), and remove the 
base. 
2) Using a screwdriver or other suitable tool, 
remove the plastic tab located on the back of 
the base (Figure 7-I); the HHEU modular 
connector for the headset will be accessed 
through this opening. 
, 
7-8  
						

							INSTALLATION-TELEPHONE 
SECTION 200-096-207 
FEBRUARY1991 
3) Set the SW601 switch on the HHEU to 
HEADSET for the headset/loud bell applica- 
tion (Figure 7-10). 
4A) Connect the HESC-65A cable to P601 of the 
HHEU if the loud ringing bell option is re- 
quired (see Figure 7-10). 
4B) If the headset receiver is not to receive OCA, 
cut one side of the R607 resistor on the HHEU 
(Figure 7-10) and then remove the resistor to 
eliminate electrical contact. 
5) Position the HHEU PCB on the standoffs 
inside the base (Figure 7-10) and securewith 
the two screws provided. 
6) Connect the HHEU PCB to the telephone’s 
upper PCB (Figure 7-l l), labelled DKTl O- 
SUB(SPF). 
7A) Refer to Figure 7-11, and locate the EXSP, 
W305, strap on the upper PCB, and cut it if an 
HHEU will be connected to an HESB for the 
loud ringing bell option. 
COMPONENT SIDE OF HHEU (V.3 or later) 
FlGURE7-lo-HHEUINSTALLATION 
FOR DIGITALTELEPHONE 
. 
W401-1020SD 
W302-1020H 
FlGURE7-II-DIGITALTELEPHONEPCB 
CONNECTIONSANDSTRAPS 
7B) Refer to Figure 7-l 1, and locate the HHEU 
strap, W303, on the upper PCB, and cut it if an 
HHEU will be connected to a headset. 
8) Reinstall the telephone base (Figure 7-l), 
and secure it with its four captive screws. 
NOTES: 
1. The HESC-65A cable is for lOOO-series 
digital telephones and 6500-series elec- 
tronic telephones. The HESC-65 cable is 
for 6500-series electronic telephones only. 
2. If using the HESB as a loud ringing bell, 
refer to Section 200-096-208, External 
Speaker (HESB) Options, for wiring de- 
tails. 
4.14 DVSU Upgrade Installation. Install the off- 
hook call announce (DVSU) upgrade in accor- 
dance with the following steps. 
1) Loosen the four captive screws securing the 
telephone base (Figure 7-l), and remove the 
base. 
2) Loosen the four captive screws securing the 
metal plate to the standoffs inside the base 
where the DVSU wi,fl be installed (Figure 7- 
12). Remove the metal plate, which can be 
discarded. 
7-9  
						

							INSTALLATION-TELEPHONE 
SECTION 200-096-207 
FEBRUARY1991 
3) Position the DVSU PCB on the standoffs 
(Figure7-12),andsecurewiththefourscrews 
provided. 
4) Connect the DVSU wire plugs to the connec- 
tors labelled DVSU on both of the telephone’s 
PCBs (Figures 7-l 1 and 7-12). 
IMPORTANT NOTE! 
Make sure that the DVSU wire plugs are 
connected to the proper connectors. 
5) Reinstall the telephone base (Figure 7-l), 
and secure it with its four captive screws. 
4.15 Carbon Straps: If a carbon-type handset or 
headset is used with the digital telephone, two 
jumper straps on the telephone’s upper PCB, 
labelled DKT-SUB(SPF), must be cut. To cut the 
straps: 
1) Loosen the four captive screws securing the 
telephone base (Figure 7-l), and remove the 
base. 
IMPORTANT! 
Make sure that the DVSU wire 
TO DVSU plugs are inserted into the 
correct UPPER and LOWER 
CONNECTOR 
PC0 connectors of the 
ON UPPER PCB telephone. Do not plug DVSU 
INSIDE into HHEU connector. 
TELEPHONE 
FlGURE7-12-OVSUINSTALLATION 
2) Refer to Figure 7-l 1, and locate the CARBON 
straps, 
W301 and W302, and cut them. 
. 
3) Reinstall the telephone base (Figure 7-l), 
and secure it with its four captive screws. 
4.16 Beep Strap. A beep is emitted whenever a 
dialpad button or flexible button is pressed. This 
beep can be eliminated if the BEEP strap is cut. To 
cut the strap: 
1) Loosen the four captive screws securing the 
telephone base (Figure 7-l), and remove the 
base. 
2) Refer to Figure 7-l 1, and locate the BEEP 
strap,W304, on the telephone’s upper PCB, 
labelled DKTl O-SUB(SPF), and cut it. 
3) Reinstall the telephone base (Figure 7-I) 
and secure it with its four captive screws. 
4.17 Microphone/Speaker Threshold (speak- 
erphone only). 
If the speaker cuts off frequently 
during handsfree operation because of high ambi- 
ent noise levels, set the ROOM NOISE switch to 
the high position. To set the switch: 
1) Loosen the four captive screws securing the 
telephone base (Figure 7-l ), and remove the 
base. 
2) Refer to Figure 7-l 1, locate the ROOM NOISE 
switch on the telephone’s upper PCB, la- 
belled DKTlO-SUB(SPF), and push it care- 
fully to the high (H) position. 
3) Reinstall the telephone base (Figure 7-l), 
and secure it with its four captive screws. 
4.18 Wall Mounting. Digital telephones mount on 
walls and other vertical surfaces the same way 
electronic telephones do. See Paragraph 3.13. 
NOTE: 
Digital telephones equipped with PDIU-Dls 
cannot be wall mounted. 
7-10  
						

							4.20 Digital Telephone Connections 
4.21 
Wiring Diagrams, Section 200-096-209, 
provide point-to-point MDF wiring diagrams for 
connecting digital telephones, DDSS consoles, 
and PDIU-DSs to STRATA DK systems. Refer to 
Programming Procedures, Section 200-096-300, 
for programming requirements and procedures. 
The following paragraphs provide general re- 
quirements for telephone installation. 
WARNING! 
1. Never install the telephone wiring dur- 
ing a lightning storm. 
2. Never install the telephone jacks in 
wet locations unless the jack is spe- 
cifically designed for wet locations. 
3. Never touch uninsulated telephone 
wires or terminals unless the telephone 
line has been disconnected at the net- 
work interface. 
4. Use caution when installing or modify- 
ing telephone lines. 
4.22 Digital telephonesareconnected to the PDKU 
(via the MDF) with standard twisted-pair jacketed 
telephone cable. Single-pair wiring is sufficient 
unless the system must operate on reserve power 
or in the case of a digital telephone with a PDIU-DI. 
In these cases, two-pair wiring should be used for 
extra power (see Section 200-096-209 for details). 
To accommodate the digital telephone line cord, 
the cable should be terminated in a modular sta- 
tion connector block (RJ-1 1 ) at the station location. 
The standard modular digital telephone cord length 
is 7 feet (the maximum allowed length is 25 feet). 
4.23 The overall length of the station cable (single 
pair) run from the KSU to the telephone or PDIU- 
DS must not exceed 1,000 feet (305 M) if using 24 
AWG cable and being powered by the PPSU. If 
operating on battery backup or if PDIU-Dls are 
installed, a second pair of wires is required for 
stations to operate effectively at 1000 feet (see 
digital telephone and DIU MDF wiring require- 
ments in Section 200-096-209). 
CAUTION! 
When installing the station cable, do not 
run parallel to and within 3 feet of an AC INSTALLATION-TELEPHONE 
SECTION 200-096-207 
FEBRUARY1991 
power line. AC power lines should be 
crossed at right (90”) angles only. In par- 
ticular, avoid running station wire pairs 
near devices thatgenerateelectricalnoise, 
such as neon or fluorescent light fixtures. 
4.30 DDSS Console Connections 
4.31 
DDSS consoles must be located adjacent to 
a digital or electronic telephone (preferably an 
LCD model). DDSS consoles are connected to the 
PDKU (viathe MDF) using standard twisted single- 
pair or two-pair jacketed telephone cable (maxi- 
mum 1000 feet, 303 M). The console uses only 
circuit 8on the PDKU. To accommodate the DDSS 
console connection, the instrument end of the 
cable should be terminated in a modular station 
connector block (RJ-11). Refer to Wiring Dia- 
grams, Section 200-096-209, for wiring/intercon- 
necting details, including cable length limitations. 
CAUTION! 
When installing the station cable, do not 
run parallel to and within 3 feet of an AC 
power line. AC power lines should be 
crossed at right (90”) angles only. In par- 
ticular, avoid running station wire pairs 
neardevices thatgenerateelectricalnoise, 
such as neon or fluorescent light fixtures. 
4.32 DDSS Console Configuration. 
The follow- 
ing considerations should be made when installing 
DDSS consoles: 
l A PDKU PCB is required to use the DDSS 
console. 
l A maximum of four DDSS consoles are allowed 
per system. 
l One PDKU circuit is required for each DDSS 
console (always circuit 8). 
l Only one DDSS console may be connected to a 
PDKU. 
4.33 DDSS Programming Overview 
Program 03 
l Code 64 identifies PDKU slots that support 
DDSS consoles. 
I 
Program 28 
l Assigns DDSS console(s) to digital telephones. 
7-11  
						

							INSTALLATION-TELEPHONE 
SECTION 200-096-207 
FEBRUARY1991 
Program 29 
l Assigns DDSS console’s individual button func- 
tions. 
4.40 PDIU-DI Connections 
4.41 A digital telephone with an integrated data 
interface unit (PDIU-DI) requires one wire pair and 
one PDKU circuit (See Paragraph 4.20 for digital 
telephonewiring information and Section 200-096- 
208 for instructions on how to connect peripheral 
devices to PDIU-Dls). 
4.50 PDIU-DS Connections 
4.51 The stand-alone data interface (PDIU-DS) is 
connected to a single dedicated PDKU circuit with standard twisted-pair jacketed telephone cable. 
Single-pair wiring is sufficient, unless the system 
must operate on reserve power. In this case, two- 
pair wiring should be used (see Section 200-096- 
208for more wiring information and instructions on 
how to connect peripheral devices to PDIU-DSs). 
NOTE: 
PDIU-DSs can be connected to PDKU cirucits 
I - 7. 
I 
‘. 
-. 
. 
,’ 
7-12  
						

							TOSHIBASYSTEM PRACTICES 
DIGITALKEYTELEPHONESYSTEMS INSTALLATION-PERIPHERALS 
SECTION 200-096-208 
FEBRUARY1991 
Stra ta@mcr 
RELEASE 1,2, and.3 
INSTALLATION 
CHAPTER EIGHT 
PERIPHERALS INSTALLATION  
						

							INSTALLATION-PERIPHERALS 
SECTION 200-096-208 
FEBRUARY1991 
PARAGRAPH TABLEOFCONTENTS 
SUBJECT . 
PAGE 
1 
2 
2.10 
2.20 
3 
3.10 
3.20 
4 
4.10 
4.20 
5 
5.10 
5.20 
6 
6.00 
6.10 
7 
7.10 
7.20 
8 
8.10 
8.20 
8.30 
9 
9.00 
9.10 
9.20 
10 
11 
12 
12.00 
12.10 
12.20 
12.30 
12.40 
12.50 
12.60 
12.70 
12.80 
13 
13.00 
14 GENERAL ............................................................................................................... 
RESERVE POWER/POWER FAILURE 
OPTIONS.. ............................................... 
Reserve Power Option ........................................................................................ 
Power Failure Emergency Transfer Option 
......................................................... 
MUSIC-ON-HOLD/BACKGROUND 
MUSIC OPTIONS .......................................... 
Music-on-Hold (MOH) Option .............................................................................. 
Background Music (BGM) Options ...................................................................... 
RELAY CONTROL OPTIONS 
................................................................................. 
External Page/Door Lock Relay Options ............................................................. 
Night Transfer/Music-on-Hold Relay Options 
...................................................... 
EXTERNAL SPEAKER UNIT (HESB) OPTIONS.. .................................................. 
System Hardware Requirements 
........................................................................ 
HESB Option Installation 
..................................................................................... 
EXTERNAL PAGE OPTIONS ................................................................................. 
System Hardware Requirements 
........................................................................ 
External 
Page Option Installation ........................................................................ 
STATION MESSAGE DETAIL RECORDING (SMDR) PRINTER/CALL 
ACCOUNTING DEVICE 
OPTIONS.. ....................................................................... 
EXAMPLE l-Ring, 
No Answer DISA Call ......................................................... 
EXAMPLE 2-DISA Internal Station Call 
............................................................ 
EXAMPLE 3-DISA Outgoing CO Line Call ....................................................... 
SMDR Hardware 
Requirements .......................................................................... 
SMDR Printer/Call Accounting Device Installation .............................................. 
MAINTENANCE TERMINAL OPTIONS.. ................................................................ 
Maintenance Terminal/External Modem Option System Hardware 
Requirements ...................................................................................................... 
Local Maintenance Terminal Installation ............................................................. 
Remote Maintenance Option 
Installation ............................................................ 
VOICE MAIL/AUTO ATTENDANT OPTIONS ......................................................... 
System Hardware Requirements ........................................................................ 
INTOUCH Digital Voice Messaging System 
........................................................ 
Customer-supplied Voice Mail Messaging Systems.. .......................................... 
ALARM SENSOR INSTALLATION ......... 
................................................................ 
NIGHT RINGING OVER EXTERNAL ZONE PAGE (Release 3) ............................ 
DATA INTERFACE UNIT INSTALLATION (Release 3) .......................................... 
General ............................................... 
................................................................. 
Common DIU Connections 
.................................................................................. 
EIA Interface Leads 
(Signals). ............................................................................. 
DIP Switch Options 
............................................................................................. 
PDIU-DI to Personal Computer (PC) Installation 
................................................ 
PDIU-DS to Printer Installation ............................................................................ 
PDIU-DS to Modem Installation 
........................................................................... 
PDIU-DS Disassembly and Assembly.. 
............................................................... 
PDIU-DI/PDIU-DS Installation Tests ................................................................... 
TWO-CO LINE EXTERNAL AMPLIFIED CONFERENCE (RELEASE 3) ............... 
General ................................................................................................................ 
BATTERY CARE ..................................................................................................... 
I 
IMPORTANT! 
8-1 
8-1 
8-1 
8-1 
8-2 
8-2 
8-3 
8-4 
8-5 
8-6 
8-7 
8-8 
8-8 
8-10 
8-10 
8-10 
8-11 
8-12 
8-12 
8-13 
8-13 
8-13 
8-13 
8-13 
8-14 
8-14 
8-15 
8-15 
8-15 
8-15 
8-17 
8-38 
8-38 
8-38 
8-39 
8-39 
8-40 
8-41 
8-42 
8-43 
8-44 
8-55 
8-62 
8-62 
8-63 
Digital telephones can access all features available to electronic telephones. 
8-i