Comdial Dsu II Digital Telephone System Instructions Manual

							connections. It contains a ringing generator to generate a ringing signal for the IST
devices.
Area Paging Interface
Any station user can dial a special code number in response to an all-call or zone page
and be connected to the paging party in a private conversation. All-call or zone paging is
provided to the stations through the station class of service programming.
See also,Paging.
Assist Button
This feature allows a station user to program a button to be used for sending a message to
an LCD speakerphone. Once programmed, the station user can press the ASSIST button
at anytime to sound a tone burst at the called station and present a preprogrammed
message in the station display. The user can send a message while on a call without
alerting the distant party. This feature is useful for requesting assistance while engaging
on a call. For example, a customer service representative could request assistance from a
supervisor while talking to a problem caller. The supervisor, upon receiving the tone and
noting the display message, could perform an executive override or service observing
action to join the call or monitor it.
See also,Messaging.
Automatic Callback
If a telephone user encounters a busy tone or a ring no-answer after calling an intercom
station, She or he can dial a special code number that will cause the system to
automatically ring both the user’s telephone and the one that he or she was calling. This
automatic callback occurs after the busy station becomes idle or after the user at the ring
no-answer station takes some action at it that indicates to the system that it is available to
be answered. No class of service programming is required to enable this feature.
See also,Intercom.
DSU II Digital Telephone System IMI66–132
Digital Telephone System Features A – 5 
						

							Automatic Dialing Of Stored Numbers
Automatic Dialing
The system supports up to 24 automatic dial (autodial) numbers per station. Autodial
buttons can store up to 16 digits plus an intercom or line selection. Stored digits include
0–9,Sand #. The system stores a pause at any point where the HOLD button is pressed,
and stores a hookflash at any point where the TAP button is pressed. Automatic dialing
provides a way to obtain one-button access to frequently used system features. This
feature does not require any class of service to enable it.
Programmable DSS/BLF
A station user can store one-button, direct station selection (DSS) at any memory button
location to create a DSS memory button. When this button is pressed, any active outside
call is automatically placed on hold and an intercom call is automatically made to that
previously stored station number. The visual indicators of the stations programmed at the
button locations form a busy lamp field (BLF). The BLF conveys station status to the
user. An autodial number can also be programmed as a secondary function at every
DSS/BLF memory location. No class of service is required.
Station Speed Dial
Each station provides 10 speed dial number locations at the keypad buttons. Station
speed dial numbers can be up to 16 digits in length and can include line or intercom
selection, numbers, #,S, pauses, and hookflash signals. A user can store a pause by
pressing the HOLD button and store a hookflash signal by pressing the TAP button.
System Speed Dial
The system provides 99 system-wide speed dial numbers. The system speed dial numbers
can be up to thirty-two digits in length, and can include numbers, #,S, pauses, and
hookflash signals. The attendant programs the system speed dial numbers and names at
station 10 or 12 for use at every station in the system. No class of service programming is
required.
IMI66–132 DSU II Digital Telephone System
A – 6  Digital Telephone System Features 
						

							Automatic Hold For Intercom
If a user selects the second intercom line while a call is active on the first intercom line,
this automatic hold feature lets the system automatically place the first intercom call on
hold. Use station class of service programming to enable this feature.
See also,Hold.
Automatic Hold—Transfer To Line
A programmer can use class of service programming to make this system feature
available to selected stations. When enabled, a user can press any line button and cause
an active line to automatically go on hold. This feature allows a user to move from line to
line without having to press the HOLD button to place any current calls on hold. Use
station class of service programming to enable this feature at the desired stations.
See also,Hold.
Automatic Pause Insertion
When the system stores a dialed number for later redial, it automatically stores a pause
whenever the user waits between digits for at least two seconds. The system inserts the
automatic pause in the stored number sequence at the point where the manual pause in
dialing occurred. The length of the automatic pause is programmable.
See also,Automatic Dialing of Stored NumbersandRedialing.
Automatic Redial (Of Busy Number Or Unanswered Call)
A user can automatically redial a busy number or unanswered call by activating this
feature. Once the user activates automatic redial, the station will select the line,
automatically dial the number, and wait for a response. It will do this once a minute for
approximately 10 minutes unless the user deactivates the feature by pressing that button
or another button or by lifting the handset. The feature cycle is timed and does not have
busy detection circuitry. Because of this, if the user is operating handsfree when the
called party answers, she or he must lift the handset to prevent the caller from being cut
off by the timing cycle. The automatic redial button is a designated programmable button
position and the user must program its location to make it active.
See also,Redialing.
DSU II Digital Telephone System IMI66–132
Digital Telephone System Features A – 7 
						

							Automatic Station Relocation
With this feature, the system will automatically recognize a particular station should that
station be relocated to a new station port. When someone places a telephone at a new port
location, it will continue to provide the same class of service parameters and respond to
the same extension numbers as it did at the original station port. A programmer must
enable this system feature using system class of service programming. As an added
feature when someone plugs an LCD speakerphone in a new station port, the system will
prompt the user on the display to verify the relocation of features.
Auxiliary Equipment Interface
An installer can use the auxiliary equipment interface to connect a telephone device or a
data device to an outside line ahead of the common equipment. The system can detect an
off-hook condition in a device that an installer has connected to the auxiliary equipment
interface, and turn on the status light for that line at telephones that have that line
appearance. It does this to indicate that the line is busy and not available for station use.
Auxiliary equipment interface connections provide connections to lines 2 and 4. A user
cannot interrupt an external device by pressing the line button unless the line has been
programmed to be non-private.
Auxiliary Ringer Interface
The auxiliary ringer interface provides “dry-contact” relay closures which track the
ringing pattern whenever the system sends ringing to a programmable destination.
Programmers can program relay control to be activated when the system sends ringing to
station port 17 or to the paging port.
When programmed for station port 17 ringing, an installer often uses an external device
to provide loud ringing. When programmed for paging port ringing, an installer often
installs an external paging amplifier to sound the rings. The system supplies ringing tones
to the paging port along with the relay closures. It can send the ringing tones to the input
of an external paging amplifier and the installer can arrange the wiring so that the relay
closures energize the paging amplifier while it is receiving the ringing tone. Use system
class of service programming to choose either the paging port or station port 17 for the
ringing port relay control. Also use system class of service to determine the type of
ringing sent to the paging port. Use station class of service programming to determine the
type of ringing that the system sends to station port 17.
Programmers can arrange for the system to send ringing tones for particular lines
through the PA port. They can choose between intercom tone and DTMF signaling tone
for the PA port ringing. They should choose the intercom tone if they desire a soft tone
and the DTMF tone if they desire a loud tone.
See also,Ringing.
IMI66–132 DSU II Digital Telephone System
A – 8  Digital Telephone System Features 
						

							B
Background Music
If the installer connects a customer-provided external music source to the system, the
music from that source will sound through the station loudspeakers after the users turn it
on at their stations. They can adjust the loudness of this background music with the
loudspeaker volume control. The system automatically turns the background music off
during calls. This feature requires no class of service programming.
See also,Music Features.
Basic Key Service (1A2) Emulation
The system provides all of the basic, 1A2-type, key service features. These features are:
selective line pickup, common line pickup, multiline pickup, and hold. No special class
of service programming is required.
Battery Back-Up
Battery Back-Up (Chassis, Cable, And Batteries)
The manufacturer offers battery back-up assemblies including chassis, cable, fuses, and
batteries as optional kits available through normal distribution channels. The assemblies
are designed so that installers can connect them directly to the uninterruptable power
source (UPS) interface located on the common equipment chassis. The system does not
require any action from the telephone user to make it operate on battery power nor does it
require any class of service programming action on the programmer’s part.
Battery Back-Up Interface
The common equipment cabinet provides an interface for an optional battery back-up kit
to give full uninterrupted system power in case of an AC power loss. The switching and
charge circuitry are in the common equipment, while the batteries, chassis, and cable are
packaged as a separate option. When plugged into an active AC power source the
common equipment will constantly charge the attached batteries. Built-in circuitry
automatically switches to battery power when AC power is lost. With batteries at full
charge, a fully loaded system will operate for a minimum of one hour without AC power.
DSU II Digital Telephone System IMI66–132
Digital Telephone System Features A – 9 
						

							Block Programming
A programmer can assign a particular line or station’s class of service to an entire block
of lines or stations with one programming action. This feature eliminates the need for
him or her to individually program stations and lines with the same class of service. A
programmer can perform a block programming class of service after he or she has
programmed a station class of service or line class of service for a particular station or
line.
See also,Class Of Service.
C
Call Announce With Handsfree Answerback
The internal loudspeaker at each station provides call-announce capability over the
intercom link. A user can make a handsfree response to a call-announce call without
lifting the handset.
The user can use the MUTE button to block all handsfree answerback response. This
arrangement will prevent a station user from monitoring another station site using the
monitoring ability of the voice announce feature. When a user presses the MUTE button,
all handsfree answerback is disabled, inhibiting any off-site monitoring. The MUTE light
turns on to indicate that this feature is active.
See also,Intercom.
Call Costing And Station Message Detail Accounting Reports
The system provides built-in, estimated costing of all outside calls. It also provides
station message detail accounting (SMDA) printout reports of all costed calls and
displays call costs on LCD speakerphones.
Call costing, in general, provides a means of establishing costs to be applied to outside
calls made from system telephones. Call costing computes charges for a call after it is
completed. It does not restrict dialing as toll restriction does. Call costs are based on a
two-tier time rate and includes a line surcharge cost. A programmer can program
allowances for call set-up and minimum call duration. The system provides several ways
of determining call costing, making it possible to apply reasonable rates for the entire
country.
The system will automatically provide a report whenever the costed call storage reaches
95 percent of capacity. Additionally, the programmer can arrange for these reports to be
printed automatically at a specific time of day.
IMI66–132 DSU II Digital Telephone System
A – 10  Digital Telephone System Features 
						

							The system can produce five different SMDA records:
·Detailed report sorted by stations,
·Detailed report sorted by account codes,
·Line summary report,
·Department summary report,
·Department Call Distribution (DCD),
·A general output of all records.
Upon completion of report printing, the telephone attendant can delete all records the
system used for the reports. The system will not delete any call records created between
the time the report printout was started and completed. If the attendant does not delete the
reports after they are printed, a later command to delete records will delete all records at
that point and not just the ones that were printed in the previously generated reports. The
programmer can take programming action to always delete the records after they have
been printed. The attendant has the ability to request particular reports to be printed at
any time they are required.
The programmer can establish account codes to allow system users to identify calls by
category or by any other desired grouping so that the system can report costing by that
category or grouping. Further, the programmer can define department numbers and
assign stations to different departments so that the system can produce call cost reports
on a department-by-department basis.
Programmers must use call costing and SMDA reporting class of service programming to
set the costing features, and assign stations to specific SMDA departments using the
station class of service programming. He or she can also enable the LCD speakerphone
display of costed calls through station class of service programming.
SMDA Reporting Through VDT Programming and Per-Station SMDA
The programmer can use the VDT programming option to request that the system send
SMDA reports to either data port A or data port B for printout. It is also possible to use
this feature remotely through a data communications arrangement to capture SMDA
reports. In addition, the system provides SMDA station reports for individual stations
when the attendant requests them by dialing certain code numbers at station 10 or 12.
Note, however, that the system can provide only one station report at a time.
Station Message Detail Recording (SMDR)
The SMDR feature generates a call record for printing as soon as the system collects the
record. It presents the call record at an RS-232 level as ASCII transmit data in an
80-column format at the data port available for that purpose.
DSU II Digital Telephone System IMI66–132
Digital Telephone System Features A – 11 
						

							Call Forwarding
Call Forwarding On All Calls
This feature allows a station user to designate another station or the attendant station as
the recipient of all calls normally directed to ring at his or her station. If the user has call
forwarding enabled when the attendant activates night transfer of ringing, the system
forwards the night ringing assignment of the user’s station. Calls that the system
forwards to a recipient station can be forwarded again by that station user to another
station. Thus, two levels of call forwarding on all calls can occur, first, from station A to
station B and then, from station B to station C. As a reminder that call forwarding is
enabled, a short tone burst will occur at the user’s station for each intercom call that it
receives while its calls are forwarded.
When the programmer has assigned a call forward button to a station, its associated LED
will turn on to indicate that the feature is enabled when the user presses it; however, if
the call forward button is programmed as a second level to a DSS/BLF button, the system
reserves the LED indication for BLF indication. On LCD speakerphones that are
recipients of call forwarding, the display will indicate the extension number or station
name for the station from which an intercom call was forwarded.
Call Forwarding—Personal
Call forwarding of personal calls allows a station user to designate another station
number (or the attendant station number) to be the recipient of intercom and prime line
calls normally directed to that user’s station.  For each intercom call received while call
forward is enabled, a ring reminder (short tone burst) will be sounded at the forwarding
station to remind the user that his or her calls are being forwarded. On LCD
speakerphones that are recipients of call forwarding, the display will indicate the
extension number or station name for the station from which an intercom call was
forwarded.
Call Forwarding of Ring No-Answer (RNA) and/or Busy Calls
With this call forwarding enhancement, the sytem can forward both the RNA and the
busy calls that a station receives or forward just the RNA or just the busy calls that the
station receives. Being able to separate these call forwarding schemes allows users to
have forwarding just for the calls that ring their stations when they are away from their
telephones but not burden their hunt-linked fellows with calls they receive while they are
busy on existing calls.
A RNA call first rings for a programmed number of times at the receiving station then
start ringing at the station that is hunt-linked to the receiving station. If that hunt-linked
station is also hunt-linked to another station, the call will follow that link. A call to a busy
station will immediately start ringing at the station that is hunt-linked to the busy station.
If that hunt-linked station is also hunt-linked to another station, the call will follow that
link.
IMI66–132 DSU II Digital Telephone System
A – 12  Digital Telephone System Features 
						

							To enable this feature enhancement, programmers must first enable tone first signalling
and arrange an intercom hunt group.  Then, they can individually enable call forwarding
for RNA calls and call forwaring for busy calls. They can turn on either call forwarding
scheme alone or turn on both schemes as the site demands dictate.
Ring-No-Answer Forwarding Of Transferred Calls
This feature 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
DSU II Digital Telephone System IMI66–132
Digital Telephone System Features A – 13 
						

							Call Park
The call park feature is similar to a manual hold condition. A user can park a call a
particular station and retrieve it at any station in the system by dialing the appropriate
access code.
NOTE: The retrieving station must have access to the line on which the call appears.
Calls are parked and retrieved within the system through the use of dialing codes. The
system provides nine parking circuits (orbits). Call park, when used with the paging
features, allows a system attendant to direct calls to roving personnel. A call that is left in
a parking orbit for preprogrammed length of time automatically returns to a timed hold
recall condition at the station where the user originally parked the call.
See also,Hold.
Call Pickup
Directed Call Pickup
A station user can dial a code, followed by the extension number of a ringing station, to
answer the ringing call.
Group Call Pickup
If a call rings to any station in a pre-programmed group and another user in the group
wishes to answer the call, that user may dial the group pickup code and answer the call.
Four different groups can exist with any number of stations in a group. Overlap is
provided by allowing stations to be in more than one group thus enabling those stations
to pick up for stations in more than one group.  The programmer must place the system
stations in logical answering groups by group them together using the station class of
service programming.
Call Transfer
Screened Call Transfer
Screened call transfer allows station users to transfer outside calls from one station to
another, via the intercom link, in one of two ways. If both stations have access to the line,
a user effects a common line pickup transfer. If the other station does not have access to
the incoming line, the user uses the transfer/conference button to effect the transfer. For a
screened transfer, the transferring user precedes the transfer with an announcement to the
party that is to receive the transferred call.
IMI66–132 DSU II Digital Telephone System
A – 14  Digital Telephone System Features