Comdial Digital Telephone System Instructions Manual

							IM166-107Descriotion Of System FeaturesRinging 
- continued
Ring, No-Answer (RNA)
Forwarding Of Transferred Calls
Software release 14A enhances the existing automatic
RNA call forwarding feature to include forwarding of
transferred lines to individual stations. When a
telephone user transfers a line to a station, the call will
ring at the station receiving the transfer for the
programmed number of rings. After that, the call will
start ringing at the station that is hunt-linked to the
station first receiving the transfer. If that station is also
hunt-linked to another station, the call will follow that
link. When the transfer recall time expires, the call will
recall back to the station that initiated the transfer. The
hunt link can be a circular one. The transferred line
will circle the hunt link until it recalls. Alternately, the
station can be hunt-linked to voice mail so that a
transferred call will forward to the station’s voice mail
box if it is unanswered. For this feature to work
properly, the following details must be considered:
- you must hunt-link the station receiving a transfer to
another station;
- you must program the number of rings to occur
before forwarding;
- you must insure that the transfer recall time is larger
than the total time of RNA to all hunt linked stations (if
it is not, the transferred call will recall before the call
gets to the end of the hunt link).
For an example of this last consideration, assume
station 12 is hunt-linked to station 13 which is also
hunt-linked to station 14. Further assume that station
12 and 13 have their RNA’s set to two rings. A call that
is transferred to station 12 will ring there twice, then it
will ring at station 13 twice, then it will ring station 
14
until transfer recall time expires. Each transfer ring
cycle is approximately four seconds; therefore, the line
will ring the station for approximately eight seconds
before it moves to the next station. Since there are
three stations linked together, this event will require 24
seconds. This means that you should set the transfer
recall time for 25 seconds or higher.
You can use this formula to determine minimum
transfer recall time.
If:
4 = transfer ring cycle time in seconds
R = how many RNA rings assigned per station
S 
= how many stations are in hunt list
Then:
4 x 
R x S = minimum transfer recall time
2-20A
Ringing Features - continued on next page. . .
(TAB117pll) 
						

							Ringing - continued
Flexible Ringing Assignments
Ringing assignments are programmable on a per
station/per line basis. Ringing can be controlled for
every line that has an appearance at each station.
Delayed ringing is assigned to certain lines at each
station through station class of service programming.
Flexible Ringing Assignments Of PA Port
The PA port can be programmed for flexible ringing
assignments and zone pages. Any desired lines can
be programmed for direct ring, delay ring, or night
transfer (of ringing) at this port. Paging can be to
programmed zone or to all-call. A speaker can be
connected to the PA 
port to sound the ringing that is
generated by the system and sent to this port and
paging announcements when they are sent to the
programmed zone. Using such an arrangement, 
lt is
possible for a user to determine that certain lines are
ringing, such as in a night transfer (of ringing) mode,
and go to the nearest telephone and answer the call.
The most common use for this arrangement is as a
night bell eliminating the need for external equipment
as required with the common ringer and auxiliary.
ringer interface. The speaker cannot be used for voice
response as the path is one-way only. Use system
class of service programming to assign ringing and
paging to a PA port.
Night Transfer (Of Ringing)
Night transfer (of ringing) is an attendant-controlled
feature that transfers the day ringing program of all
incoming calls to a particular station or stations for
off-hour or special purpose answering. The night
transfer mode can only be activated from
station 10 or 12. The individual lines at each station
that are to be transferred with this feature are selected
by station class of service programming.
Night Transfer (Of Ringing) Button
With software release revision 8, a night transfer of
ringing, or night mode, button is available at attendant
stations. The night mode button gives attendants at
stations 10 and 12 the ability to place the system into
the night transfer of ringing mode of operation by
simply pressing one button instead of entering the
multiple keystroke sequence previously required. The
night mode button toggles the feature on and off with
one keystroke and the light located above the
Intercom button on attendant telephones flutters to
indicate when the night transfer or ringing is active.
Personalized Ringing Tone
The system provides a group of distinctive tones for
station ringing. A station user can choose a tone from
this group to provide a distinctive ring at his or her
IMl86-107
Description Of System Features
telephone. Often, when several telephones are
located close to each other, each user chooses a
different personal ring tone. The system provides six
distinctive tones for users to choose from.
Subdued Ringing
When a station is busy on a call and another call
comes to the same station, the system will
automatically subdue the ringing of the second call to
a lower volume.
Ringing Line Preference
Refer to the discussion titled Line Features.
Saved Number Redial
Refer to the discussion titled Redial.
Self Diagnostics
Each station can execute a self test when so enabled
by anyone who wishes to do so. This test verifies
processor, indicator, and tone functions.
Service Observing
Service observing allows a third party to enter an
in-progress call in an unannounced muted mode to
monitor the conversation. The system does not send
any warning tones when the call entry is made. This
feature is useful in allowing a supervisor to monitor the
performance of an employee during a phone
conversation 
with’s client. For a station to provide the
service observing feature, it must also have the
executive override feature enabled. When the
programmer enables the service observing feature,
the system automatically enables the executive
override feature as well. A programmer can enable 
or
block service observing (and executive override) at
each desired station using station class of service
programming procedures.Sin 
k-Line Proprietary
9elephone Support
With software release revision 11 A, the digital
telephone system provides support for the proprietary
single-line digital telephone product code 7701 X and,
with software release revision 
12A, support for product
code 8101 N as well. The system automatically
recognizes the proprietary single-line digital telephone
when the installer connects it to a station port, This
means that the system programmer does not have to
take any special programming steps to allow it to
operate. He or she can use any of the station
programming described in this system manual to
adjust the parameters of the station port as they are
needed.2-21 
						

							Description Of System FeaturesIM166-107
Speakerphone Support
The digital telephone system supports the operation of
proprietary speakerphones. Beginning with software
release revision 11 A, the system enables a
speakerphone’s ability to originate handsfree
operation for voice-signalled intercom calls in addition
to all of the other features that it normally provides.
Square/Non-Square Configuration
A programmer can arrange for a system to be square
or non-square as desired. In a square system, the line
1 buttons of all telephone stations select line 1, the line
2 buttons select line 2, etc. In a non-square system,
each line select button at every station may be
assigned individually to select any line: A programmer
can perform unique button mapping for line
appearance on each station using the station class of
service programming.
Flexible Station Numbering Plan
The system supports a flexible station numbering plan
for individual stations. Each station can be
programmed to respond to the dialing of any available
number between 10 and 7999. This feature may be
used to match the calling number of a station located
in a pre-numbered area to that area number. A
combination of two, three, or four digit extension
numbers can be assigned as long as they do not
conflict. For example: If 21 is assigned as an
extension number, there can not be any other
extension number assigned that begins with a 21. The
system class of service programming is used to assign
extension numbers to individual station ports.
Tenant Service
A system programmer can arrange for one telephone
system to be used for multiple tenants at a site
location by employing flexible line appearance at each
station. The programmer can perform button mappingfor line appearance on each station in the system
using the station class of service programming.
Station-By-Station Privacy
See the discussion titled Privacy.Station 
Messa eMpt$l Accounting
is
See the discussion titled Call Costing and SMDA
Repotting.
Station Message Detail Recording (SMDR)
See the discussion titled Call Costing and SMDA
Reporting.
Station Monitoring With DSS Call Pickup
The busy lamp field (BLF) of a station can provide
visual indication of the idle, busy, and ringing status of
monitored stations. This monitoring station can also
provide audible indication of any direct and delayed
ringing that occurs at the monitored station if the
programmer has enabled the visual ring indication
feature. A user at the monitoring station can make a
one-button pickup of a tinging call at a monitored
station by pressing the direct station selection (DSS)
button associated with the ringing station.
The programmer can enable or disable the flashing
BLF lights associated with visual ring indication on a
system-wide basis. When the programmer enables
the flashing lights, he or she can then enable the
audible indication of ringing on a station-by-station
basis.
Station Speed Dial
Refer to the discussion titled Automatic Dialing.
Station-To-Station Messaging
Refer to the discussion titled Messaging.
2 
- 22 
						

							IMl66-107
Description of System FeaturesSpecialized Route Access
Software release 14A provides a specialized route
access feature that, when enabled, allows the system
to select a line group based on the digits the user has
dialed. By doing this, it matches calls with their best
suited routes. The feature provides a table-driven
routing scheme where the numbers that users dial
cause the system to chose a line group after
comparing the dialed number with entries that are
contained in an office code table, an area code table,
and four special area code look-up tables.
The specialized route access operates in the following
manner: When the caller presses 
ITCM and dials 9 or
presses a preprogrammed button, the system returns
a special dial tone. The caller then has 10 seconds in
which to dial some digits; otherwise, the telephone will
return to its idle state. Once a caller begins to dial
digits, he or she has a certain period of time in which
to dial each new digit. The system programmer
selects this time-out period through programming.
After the caller has stopped dialing digits and the end
of the time-out period has occurred, the system
analyzes the dialed digits and routes the call by
following the table-driven routing scheme depending
upon how the programmer has arranged the system.
The system routes calls based on comparison
matches between the dialed number and the entries
that it finds in either an office code table, an area code
table, or four special tables for selected area codes.
These tables contain 1000 entries from 000 to 999 and
the programmer can assign one line group to each
entry; therefore, a routing match is always possible.
The system matches dialed digits with table entries in
the following manner:l
If the first digit that the caller dials is neither a 1 nor
a 0, and if he or she dials less than 10 digits (such
as : nnn-nnnn), the system evaluates the first three
digits as an off ice code, searches for the off ice
code in the office code table, and finds a line group,
If the first digit is either a 1 or a 0 (such as:
n-nnn-nnnn), the system ignores the first digit and
evaluates the next three digits as an office code,
searches for the office code in the office code table,
and finds a line group,l
If the first digit that the caller dials is neither a 1 nor
a 0, and if he or she dials 10 digits or more (such
as nnn-nnn-nnnn), the system evaluates the first
three digits as an area code and the following three
digits as an office code.
If the first digit that the caller dials is either a 1 or a
0 (such as n-nnn-nnn-nnnn), the system ignores
the first digit, evaluates the next three digits as an
area code, and evaluates the following three digits
as an office code.After digit evaluation the system routes the call as
per the following discussion: If there is a special
table that matches the dialed area code, the system
searches that table for the dialed off ice code and
finds a line group. If there is not a special table for
that area code, the system just searches the area
code table for it and finds a line group.
The following information illustrates the digit evaluation
scheme.
Qty. of Actual
DigitsDialed. .d D@sDigits Evaluated By System
To Find Line Groupc767067
3116118
t45173517
79787700978
8
19787700978
10
8049Z83700 1804.978
1118849782200 1804,978t
The example below shows how calls to area code 202
are routed using line group 2, calls to office code 202
are routed using line group 1, calls to office code 973
in area code 716 are routed using line group 4, and all
other calls are routed using line group 1.
90111
DO711
707171
31711
1973
14
11
9981
1
99911
Specialized Route Access - continued on next page . .
2-22A(TAB117p13) 
						

							Description of System FeatureslMl66-1.07
Specialized Route Access - continued
The programmer can arrange for the system to insert
up to six digits ahead of a dialed number for a selected
line group. This feature is useful if the dialed number
must match a specific common carrier format.
To help understand this digit insertion, review this
typical arrangement for transparent 
CENTREX
operation (This example assumes that the 
CENTREX
extensions do not conflict with the office codes.): With
the digital telephone system installed behind a
CENTREX system, callers can make outgoing calls
without having to dial 9. Assume that the 
CENTREX
extensions are 3300 -3399. Take programming action
to assign line group 2 to entries 330 
- 339 in the office
code table. This means that calls on 
CENTREX
extensions will use line group 2 and all other calls will
default to use line group 1. Program the 9 digit as the
insertion digit for line group 1.With this set up, when
a caller dials a number other than a 
CENTREX
extension, the system automatically inserts a 9 ahead
of the dialed digits and routes the call over line group 1.
If no lines are free in a selected line group, the system
will route the call to an overflow line group if the
programmer has assigned one; otherwise, the system
will return busy tone to the caller.NOTE: 
If the programmer has arranged for the system
to insert digits on a particular line group, he or
she should consider arranging for the system
to insert digits in the overflow line group as
well.This consideration is necessary only if it
is important for the call to route through the
same common carrier as was the original line
group.
Using Specialized Route Access For Simplified
Toll Restriction
In anticipation of the implementation of the revised
North American dialing plan, the SRA feature
provides the system with the ability to deny calling to
designated area or off ice codes. The programmer
merely assigns a line group that contains no assigned
lines to the designated office or area code. This
prevents the system from routing calls for dialed
numbers containing those particular area or office
codes since there is no line available. This action will
work only for manually dialed numbers because
automatically dialed numbers, with no line preselect,
employ the last used line and therefore cannot be
restricted.
(TAB1 
17~14)2-228 
						

							IMl66-107
Description Of System Features
group to each station port to allow or to deny SOHVA
receive and/or originate capability to it. By properly
assigning SOHVA groups to station ports, the
programmer can open or block SOHVA paths between
stations.
..JhesvstnoSOHVAarouDsDOfl does not have a.
.- ISOWA arouD It. It s u~ercan.Subdued Off-Hook Voice Announce
With the secure off-hook voice announce (SOHVA)
feature, a user can make a secure announcement
from one station to another station that is off-hook and
busy on a call. A station being operated in a
handsfree mode cannot receive a SOHVA. With
SOHVA, the caller delivers the call and the user
receiving the call responds to it in a secure manner
that prevents the distant party from hearing either the
announcement or the response. The system
precedes the announcement with a tone alert that it
delivers to the handset receiver of the called
telephone.It also supplies a tone to the announcing
caller to 
alert them that they are making a SOHVA call.
A user can respond to the SOHVA announcement
either verbally or non-verbally. He or she either
effects a verbal response by pressing and holding the
MUTE button and speaking into the handset or effects
a non-verbal response by pressing a pre-programmed
button to send a message to be shown on the display
of the announcing station (if it is an LCD
speakerphone). The system automatically
disconnects the announcing station after it delivers the
response message to it (and displayed if an LCD
speakerphone). Stations that have the voice
announce blocking feature turned on cannot receive a
SOHVA. A programmer can use station class of
service programming to disable the SOHVA feature at
a station port if desired.
SOHVA Ws to m.OHVA a anv station.
SOHVA groups are w by the system into the
following configurations:
i&Fned Off-Hook Voice Announce Originate
This feature allows a telephone user to program a
button at his or her station that she or he must press
before delivering a SOHVA call. This SOHVA enabled
button allows a caller, after hearing a busy signal, to
decide whether to interrupt the called party in a
SOHVA manner. If the caller decides that the called
should be interrupted, the caller can press the button
and complete the SOHVA call. This button, along with
SOHVA groups, allows system users greater control of
the callers 
that are allowed to make SOHVA calls and
of the situations in which they are allowed to make
them.The following examples may help you to understand
how to use SOHVA.
giM;zd Off-Hook Voice Announce (SOHVA)
The programmer can program the ability of station
ports to originate and/or receive SOHVA calls by
assigning SOHVA calling groups to station ports. This
means that he or she can arrange certain station ports
together for SOHVA calling between one another while
excluding other station ports in the system from this
group.
Example 1: Allow station port 10 to originate SOHVA
messages to all stations in the system and allow those
stations the ability to originate SOHVA messages to
each other but not to station port 10. Assign group 1
to station port 10 and assign group 2 to all other
station ports.
Example 2: Allow station ports 14 and 15 to receive
and originate SOHVA calls between each other but
deny both receive and originate capability from any
other system stations. Assign group 8 to both station
port 14 and station port 15. Do not assign group 8 to
.
The system provides eight different SOHVA groups
that are fixed into a variety of SOHVA receive/originate
configurations. A programmer can assign one SOHVAany other station port 
m be sure m all sm
d to them.
The programmer assigns SOHVA groups using the
station class of service programming procedure.2 
- 23 
						

							Subdued Ringing
Refer to the discussion titled Ringing.
System Alarm Reports
The programmer can arrange the system to report
alarm and status conditions to a particular station or
stations that he or she has enabled to receive them.
The alarm receiving station must be an LCD
speakerphone. When a station is enabled to receive
alarms, its user can take appropriate action to cause
the alarm codes to be presented on the LCD display.
A programmer must use both system and station class
of service programming to enable this feature.
System Speed Dial
Refer to the discussion titled Automatic Dialing.
Tandem Attendant
When the programmer uses system class of service
programming to enable the tandem attendant feature,
a recall from an unanswered call transfer or a timed
hold recall will ring at the normal attendant station
(station 10) that set the transfer or hold condition, and
also ring at the tandem attendant station (station 
12).
TAP (Flash/Recall)
If the host system provides custom calling features via
a hookflash signal, the programmer should program
the system so that the TAP button will generate a
“flash” signal when a user presses it. If custom calling
features are not available to digital telephone system
users, the programmer should program the TAP
button to function as a positive disconnect, dial tone
recall button. The flash and recall features are
mutually exclusive. The programmer uses the system
class of service programming procedures to set the
flash or recall TAP time.
Tenant Service
Refer to the discussion titled SquareIVon-Square
Configuration.
Timed Hold Recall
Refer to the discussion titled Ho/d,
Toll Restriction
Default Toll Restriction
The system defaults two toll restriction tables with
pre-programmed values and pre-assigned to all lines.
The programmer needs only to assign these tables to
the stations by programming action to put them into
effect.He or she can use the toll restriction table
configuration class of service programming to
reprogram the defaulted tables wlth different
information as needed. Description Of System Features
IM166-107
Flexible Toll Restriction
A system programmer can configure system toll call
restriction to prohibit some or all stations from calling a
wide range of number combinations. The restricted
numbers are specified on up to 16 tables. The system
assigns several broad-range values to two of these
tables, and assigns the tables to all lines as a default
condition. The programmer needs only to enable the
default tables on a per station basis to activate the
default toll restriction.
In general, toll restriction works as follows:
The programmable tables of restricted numbers can
contain up to four entries and each entry can contain
up to 16 digits.
A programmer programs each table of restricted
numbers to be an “allow” table or a “deny” table with
entries in an “allow” table overriding entries in a “deny”
table. This arrangement allows the programmer to
enable exceptions to toll restriction. For example, he
or she can arrange the table entries so that the system
allows the dialing of 
1-800~xxx-m numbers even
though it denies the dialing of all 
I-xxx-xxx-xxxx
numbers. A programmer can store a “match anything”
symbol (#) to represent any digit from 0 to 9 in the
individual entries thus providing him or her with a
broad range of number combinations to choose from.
The programmer can individually assign the
programmed toll restriction tables to each appropriate
station and line. Therefore, when an outside call is
dialed, the system examines the dialed number and
makes a comparison between it and the toll restriction
tables. Any tables that the programmer assigned to
BOTH the station being used and the selected line
determine the restrictions to be imposed; It should be
noted that the system will automatically disconnect a
line from a station if its user dials a restricted number
on a restricted line from a restricted station.
Night Mode Toll Restriction
A programmer can assign toll restriction tables to any
or all stations in the system that will only take effect
when the system is in the night transfer (of ringing)
mode. These toll tables replace any that he or she
may have assigned to the station for normal, or day
mode, operation. For example: a programmer can
arrange for a station that has no other toll restriction
table assignment to receive a toll restriction table
which will restrict everything but local calls and will
only take effect when the system is placed in the night
transfer (of ringing) mode. Therefore, even though
users can make toll calls from this station during
daytime operation, they can make no toll calls from it
when the attendant programs the system for nighttime
operation using the night transfer of ringing feature.
NOTE: Do not confuse this night mode to// restriction
table assignment with the night transfer (of
ringing) feature.2-24 
						

							IM166-107Description Of System FeaturesToll Restriction 
- continued
Toll Restriction Override
Software release 14A provides users of the digital
telephone system with a toll restriction override 
(TRO)
feature. The TRO feature allows users to override the
toll restriction that they encounter at other stations with
their own station’s toll restriction assignments. In
programming for this feature, you create a four-digit
TRO code that users can dial to override the toll
restrictions of any station that they happen to be using
and replace it with a toll restriction that matches their
home station. After entering a TRO code, a user gets
his or her own prime line or idle line preference and its
accompanying toll restriction assignment. They then
have 15 seconds to dial an outgoing call. Once theyhang up from a call, they have 15 seconds to make
another call without having to re-enter their TRO code.
The system marks outgoing line calls that users make
after entering a TRO code with a 
(T) in its
SMDWSMDA printouts. The station number that it
prints is that of the overriding station and not the
actual station that the call was made from. If a user
transfers a TRO call or places it on hold and picks it up
at another station, the call belongs to the new station.
You can assign the TRO code through station 10 or
VDT programming and verify assigned codes using
the station class of service data printouts.
2-24A(TAB1 17~3) 
						

							IM166-107
Description Of System Features
Tone Or Voice Signalling (Intercom)
Refer to the discussion titled Intercom.
Transferring Calls
Refer to the discussion titled Cd Transfer.
Transfer/Conference Button
A fixed button is provided that gives quick, easy
transferring and conferencing.
Unanswered Call Transfer Recall Timing
Refer to the discussion titled Call Transfer.
Voice Announce Blocking
Refer to the discussion titled Intercom.
Voice Mail Support
With software release revision 11 A, the digital
telephone system supports the use of voice
processing equipment connected to the system’s
station ports through the ATI-D analog terminal
interface. The ATI-D is a multipurpose 
m
accessory for the digital telephone system. It has dual
circuits that allow the voice mail equipment to
interface to two station ports. In addition to the
required programming task of identifying the station
ports as voice mail ports, there are several other
programming considerations associated with voice
mail operation that the programmer can make
whenever their options are wanted. These options
include the following features:
Abtomatic Attendant
With the automatic attendant feature, the voice mail
system automatically answers any line that is ringing
at a voice mail port. As a default, the system
automatically enables ringing line preference for any
port the programmer identifies as voice mail ports.
The programmer must choose a ringing assignment
for the lines assigned to the voice mail port before the
voice mail system can provide the automatic attendant
feature.
Automatic Transfer Of Voice MailThe programmer can choose the immediate transfer
mode for voice mail transfers. However, if he turns on
the screen and/or 
confim-r options provided by thevoice mail system, he must not choose the immediate
transfer mode because it allows the system to transfer
a call as soon as it answers it precluding any screen
and confirm action that the voice mail equipment can
provide.
Hunt Groups
When a station port that has been assigned to a hunt
group is busy, a call to it will ring at the next idle
station port in the group. A call will try to ring every
port in a hunt group and if all are busy, the telephone
system will return a busy tone to the caller. A
programmer can assign all voice mail ports to a
circular hunt group to take advantage of its
multiple-port interface capability. With this
arrangement, a call will first try to ring at the first port,
then 
try.the.next one and so forth until it tries all four
ports.
Voice Mail Line ID
The programmer can program the voice mail lines with
identification (ID) numbers that allow the voice mail
equipment to identify which line it is answering. The
ID numbers that the programmer assigns’ here must
match the ID numbers that are selected as part of
voice mail system programming.
Voice Mail Transfer On Busy
The programmer can arrange the telephone system to
alert a busy telephone that the voice mail equipment is
attempting to transfer a call to it. Without this
programming, the voice mail equipment will
automatically route the call to a voice mail box when it
encounters a busy signal. 
With this option, when the
voice mail equipment tries to transfer a call to a station
that is busy on a call (outside or intercom call) and the
station has an available intercom line (stations can be
programmed to have a second intercom), the intercom
will ring subdued. The user can answer the call by
pressing the button of the ringing intercom line. In
general, attendants will probably desire this feature so
they can handle multiple calls, while other station
users may prefer to have a message taken when they
are already busy on a call.
Zone Paging (Via Station Speakers)
Refer to the discussion titled Paging.2 
- 25 
						

							IMl66-107
Chapter 3
Installation
Installation
Mounting Considerations0 Screwdriver - to match fasteners
0 The common equipment cabinet should be attached
vertically to any sturdy, flat surface. It may be
vertically rack-mounted if desired.0 Electric drill - if prepared holes are required
0 Connecting tool - for fastening wires to a type-66
connector block.
0 Because of the current listing requirements of UL
1459, the length of the AC line cord on the
equipment cabinet is a maximum length of 5 feet;
therefore, the cabinet must be located within four
feet of-a proper electrical outlet. The system
requires a dedicated 
117VAC 15 AMP circuit, with a
third-wire ground, supplied to a standard electrical
outlet (NEMA 5-l 5R).
0 Crimping tool - for 623-type modular plugs
0 Volt/Ohm Meter
Installation Notice
0 The distance between the common equipment and
the 
TELCO/PBX jacks must be 25 feet or less as
per FCC requirements. A nominal distance of 7 feet
is recommended.Per The Underwriters Laboratories standard 
1459,2nd
edition, be aware of the following precautions when
installing telephone equipment that is to be directly
connected to the telephone company network:
0 Never install telephone wiring during a lightning
storm.
0 The mounting location must be secure and dry and
have adequate ventilation. The temperature range
of the location must be within 32-122 degrees F
(O-50 degrees C), and the relative humidity must be
less than 90 percent non-condensing.0 Never install telephone jacks in wet locations unless
the jack is specifically designed for wet locations.
0 Never touch uninsulated telephone wires or
terminals unless the telephone line has been
disconnected at the network interface.
0 If the mounting surface is damp or if it is concrete orl Use caution when installing or modifying telephone
masonry material, you must attach a backboard to
the mounting surface to be used for common
equipment mounting. Suitable mounting
backboards are available commercially or can be
constructed out of 
In-inch plywood cut to size.lines.
Special Mounting Consideration
When battery back-up is part of the installation, the
external batteries and cable assembly (the Comdial
BBU02 battery back-up assembly), the common
equipment, and all wiring connections must be located
in a dedicated equipment room (as defined in the
National Electric Code published by The National Fire
Protection Association, 
Quincy MA, 02269). However,
the Comdial model BBL02 anf BBL03 battery back-up
assemblies consist of a closed metal cabinet, a pair of
batteries, panel-mounted fuses, and a cable that
connects the battery back-up unit to the common
equipment. This cable is secured to the cabinet by a
strain-relief. These models are safe for installation in
general office environments and do not need to be
installed in a “dedicated equipment room.”
Tools And Hardware
0 Fasteners - wood screws (l/4 x l-inch round head),
toggle bolts, or -wall anchors
Simplified Hybrid Operation
In the past, the Federal Communications Commission
(FCC) required that telephone system manufacturers
provide a hardware strap that installers could move to
distinguish between hybrid system and key system
operation. Prior to the release of software revision
1 IA, the digital telephone system provided this strap
at either the Jl station connector or at a special
terminal 
strip (depending upon the system model).
The installer strapped two terminals together at either
the 
66M-xx station connector block or at the special
terminal strip to select the hybrid mode.Recent
rulings by the FCC have eliminated the need for the
hardware strap. Beginning with software revision 
7 lA,
whenever a programmer assigns lines to line groups
the digital telephone system automatically assumes
the hybrid mode and the system no longer includes a
hardware strap that the installer must move. The
hybrid system mode may incur a higher monthly tariff
to the telephone company; therefore, the FCC requires
that the installer report the equipment-type category
designation number (KF for key system, MF for hybrid
system) to the telephone company at the time of
installation.3-l