Comdial Dxp Plus Digital Communications System Instructions Manual

							8.4. IDirect In ward Dialing Line Examples
Example 1:Jenny’s Bakery has the following CO numbering blocks:
555-3600 to 555-3619,
555-4520 to 555-4539,
555-1200 to 555-1399.It will receive the 36nn and 45nn calls through CO lines l-5 and the lnnn calls through CO lines 6-8. The system
requires two DID blocks for use: block one for CO lines l-5, and block two for CO lines 6-8. The numbers in
DID block one have two unique digits and the numbers in DID block two have three unique digits. Assume that
DID block one is configured as wink start, tone dial, has a 2-digit string, and is named SALES. Assume DID
block two is configured as delay start, tone dial, has a 3-digit string, and is named SERVICE.
Example 2:Ed’s Telephone Mart starts with 20 CO numbers 555-2320 to 555-2339. Only one DID block is used and is
configured as wink start, pulse dial, with a 2-digit string. As the company grows, they add another 20 CO
numbers 555-3420 to 555-3439. You cannot simply add these numbers to the existing DID block translation
table. This is because a 2-digit string will not uniquely specify which number was dialed. You must either treat
these two CO blocks as two different DID blocks or increase the expected digit string quantity to three.
Increasing the expected digits for a DID translation block deletes all entries in that
block, and you must reprogram the table.
Line Features Programming 8-75 
						

							8.4.2DID Options
DID/DNIS Block NameDescription:
Choose a T-character name to associate with each DID/DNIS block.Programming:
Refer to Section 8.43.DID Control 
SignallingDescription:
Decide upon which address supervision signalling protocol that you will use. This decision will
depend upon the type of supervision that is compatible with the CO requirements.
Immediate Start: Use this protocol for rotary (pulse dial) lines. With this protocol, the CO will
not expect address supervision signalling and may begin pulsing the dialing digits as soon as 65
msec. after it connects to the line.
Wink Start: With this protocol, the CO will expect address supervision signalling. After the
CO connects to the line, the DXP Plus will reverse the polarity of the line for a period of 200
msec when it is ready to receive digits (that is, the DTMF receiver is available for tone dial
lines). This “wink” signal indicates to the CO that the DXP Pkus is ready to receive incoming
digits. After the wink occurs and the line polarity returns to normal, the CO will begin sending
the dialing digits. If the CO does not see the wink within 4 to 8 seconds (heavy traffic timings),
it may route the call to network reorder or retry the call on another line.Typically, a CO will
try to dial two times. A second failure will result in network reorder. Wink start protocol is the
best choice for its combination of integrity checks and retrial capabilities.
Delay Start: With this protocol, the CO will expect address supervision signalling.
Approximately 100 msec. after the CO connects to the line, the DXP Plus will reverse the
polarity of the line for a period of at least 140 msec. It will hold this reversal until it is ready to
receive incoming digits. At that time, it will return the polarity to normal. After the line
polarity returns to normal, the CO will begin sending the dialing digits. If the CO does not see
the line polarity return to normal within 4 to 8 seconds, it will route the call to network reorder.
There is no requirement for the CO to retry failures on lines with delay dial signalling.
Programming:Refer to Section 8.4.3.
8- 16 Line Fea Turks Progranming 
						

							Expected CO DigitsDescription:Obtain a block of numbers for use from the CO.The DXP Plus supports a maximum of 400
numbers (for example, 555-1000 through 555-1399).You can have a maximum of four DID
blocks with each DID block using its own name, signalling protocol, digit addressing method
and number of digits needed to avoid numbering conflicts. As a default, the system assigns all
DID lines to block one. A DID block represents a group of lines that the system will use to
receive calls for one or more CO directory number blocks.
NOTE: You will derive maximum user convenience ifyou choose the CO block to match the
intercom numbers that you have assigned to the DXP Plus system. (For example, if your
intercom numbers are 1000 
- 1399, they would match the sample CO block.)
Determine the quantity of unique digits in the string that you expect to receive from the CO.
The number of digits expected should be large enough to avoid numbering conflicts within a
DID block and provide future growth. In the case of the CO block mentioned above, the
quantity of unique digits is three to cover 1000 through 1399. If the CO block was 555-l 100
through 555-l 192, the string quantity would be two to cover 00 through 480.
Programming:Refer to Section 8.4.3.Dialing Mode
Description:Based upon the system’s expected incoming call volume and recommendations and
requirements of the CO, determine whether the CO will send address digits by DTMF tones or
by loop pulse (rotary) dialing. (Always choose DTMF tones if possible.)
Programming:Refer to Section 8.4.3.
ANI Delivery
Description:Enable or disable the DXP Plus to process ANI information that is delivered by the long
distance common carrier as a Tl feature on dial 800 and dial 900 lines. Refer to Section 8.7.1
for details about the ANI feature.
Programming:Refer to Section 8.4.3.DISA Voice Options
Description:Use the DISA Voice Options 1 through 4 to select digital voice announce (DVA) message
levels. For example, selecting DISA voice option 2 will cause welcome greeting 2, day main
menu 2, night main menu 2, recall no answer 2, and recall busy 2 prompts to play whenever a
DISA-configured DID line is covered by DVA. Refer to Section I6 for complete DVA
programming details.
Programming:Refer to Section 8.4.3.DID Alternate Routing
Description:Use this procedure to select an attendant station to serve as an alternate routing station. The
system will route DID calls to this station if it cannot find the digits it receives from the CO in
the translation table. The system will ring this station with a distinctive ring tone or pattern that
you program. If you do not select an attendant station with this procedure, the system routes the
call to the dial 0 station. If the dial 0 station is not available, the system returns a reorder tone to
the caller.
Programming:Refer to Section 8.4.3.
Line Features Programming 8-l 7 
						

							lM166-123DXP Pius Programming hsfruefions
8.4.3DIDlDNlS ProgrammingProgramming: 1.
2.
3.
4.
5.
6.
Press CONTROL T for main menu
From the main menu, type the selection for lines and press ENTER.
From the lines menu, type the selection for DID/DNIS block programming
and press ENTER.
From the DID/DNIS block prompt line, type the DID/DNIS block number
and press ENTER.
From the DID/DNIS block programming menu, select options, and press ENTER
From the options menu, set the parameters for the 
DID/DNIS block that you are
programming:
NZUllt3Type up to seven characters and press ENTER.
NOTE: End the DID/DNIS block name with a space if you desire a blank space between the
name and the CO digits when they show on an LCD speakerphone’s display. Also, the
number of CO digits that will show in the display is dependent on the length of the
DID/DNIS block name.
Control SignallingPress SPACE bar for protocol choice and press ENTER.
Expected DigitsType quantity (O-7) of digits and press ENTER.
Dialing ModePress SPACE bar for choice and press ENTER.
AN1 DeliveryPress SPACE bar for Yes or No and press ENTER.
DISA Voice Options
Type DVA message identification number (l-4) and press ENTER.
Alternate RoutingType intercom number (up to four digits) for station to handle
misdialed calls.
Ring Code
Type code (1-8) to specify the ringing pattern for calls to the
alternate station.
7. When finished, press ESCAPE.
8.Type y to accept changes, n to reject them, or r to resume editing
then press ENTER to return to the DID/DNIS block programming menu.
iVOTE: If you save the changes and you have changed the expected digits value, additional
prompts may appear.
6-16 Line Fea%ures Programming 
						

							8.4.4DID/DNIS Translation Tables
Description:When you initialize a translation table, you must first enter the string of CO digits that you
obtain from the telephone company. Then you must enter the intercom number that you want to
match with the first CO digit sequence in the string. With this, the system automatically
matches the remainder of the CO digit string to consecutive intercom numbers beginning with
the one that you entered. You can edit the translation table by selecting the item number for
each entry and making the changes that you deem necessary. The translation table includes the
following listed items:
CO 
Dipit String: This is the actual string of digits expected from the CO. Within a table, each
CO digit sequence in the string must be unique. While each CO digit sequence must have an
assigned extension number, you can assign the same extension number to several CO digit
sequences if you wish.
Name: As an option, you can enter a seven character name for each CO digit sequence in the
string. If you assign a name, the system will use it for LCD display during signalling.
Dav Number: This personal or group intercom number is the one that the system will ring when
a DID/DNIS call arrives through the matching CO digit sequence during normal or daytime
operations. 
DID/DNIS will not support Delay Ring, Day 1 ring, or Day 2 ring modes.
Nipht Number: As an option, you can assign a personal or group intercom number that the
system can ring when a DID/DNIS call arrives through the matching CO digit sequence during
night transfer (of ringing) operations.
Rinp Code: As an option you can choose one of eight distinctive ringing codes for each CO
digit sequence in the string. Remember, the proprietary analog telephones provide only four
distinctive ring possibilities.Line Features Programming 8-19 
						

							IM166-123BXP PIUS Programming hsPfi.dof9s
DID Translation Tables Programming
Programming:1~Press CONTROL T for main menu.
2.From the main menu, type the selection for lines and press ENTER.
3.From the lines menu, type the selection for DID/DNIS block programming
and press ENTER.
4.From the DID/DNIS block prompt line, type the DID block number and press ENTER.
5.From the DID/DNIS block programming menu, select initialize translation table,
and press ENTER,
NOTE: Ifyou choose the initialize translation table entry, the system will prompt you to enter a
range of CO digit strings (system maximum is 400 strings and maximum digits per string
is seven) and a starting extension number corresponding to the first CO digit 
string*
Once you confirm your changes, the system will update the translation table with
sequential extension numbers that are associated with the sequence of CO digit strings.
You can repeat this process, as needed, for other sequences of numbers.
6.When finished, press ESCAPE to return to the DID/DNIS block programming menu.
7.From the DID/DNIS block programming menu, select edit translation table,
and press ENTER.The screen shows a translation table in which you can perform selective editing.
NOTE: If there are more numbers in the DID/DNLS block than the screen can show9the system
places them on underlying pages.Press and hold CONTROL and type N or P to display
each next or previous page.The tab/e will form the screen so the CO digits are
displayed in sequential order. You can add additional entries to the end of the tablethat
will appear in sorted order the next time you access the table.
8.When finished, press ESCAPE twice
9.Type y to accept changes, n to reject them, or r to resume editing and press ENTER.
10. Press ESCAPE three times to return to main menu.You can erase the entries in the translation table using the system default menu.
1 eFrom the main menu, select system and press ENTER.
2.From the system menu, select defaults, and press ENTER.
3.From the defaults menu, select DID translation tables and press ENTER.
4.Type the DID/DNIS block number (1-Q and press ENTER. The system automatically
removes all entries in the chosen table.
5.Press ESCAPE twice to return to main menu.
DIDiDNIS Translation Table, DefaultDescription:You can clear programmed translation tables with this procedure.
Programming;1. Press CONTROL T for main menu.
2. From main menu, select system and press ENTER.
3. From system menu, select defaults and press ENTER.
4. From defaults menu, select DID translation table and press ENTER.
5. Type 
DID/DNIS table number (l-4) and press ENTER.
6. Repeat step 5 until finished.
7. Press ESCAPE to end.
8-20 Line Features Programming 
						

							8.5Ground Start Line Support
Description:The multipurpose line board provides system interface for loop start lines, ground start lines,
and E and M tie lines. These are typically the three different line types that the central office
(CO) makes available for connection to the public switched network. With the ground start line
type, the DXP Plus momentarily grounds the ring lead to signal the CO to establish acommunications link for an outgoing call. When the CO detects this, it acknowledges by
momentarily grounding the tip lead. The DXP Plus responds by removing its ground
connection and bridging itself across the tip and ring leads. The CO then removes its ground
connection and returns dial tone to the DXP Plus.For an incoming call, the CO grounds the tip lead and places an alternating voltage on the ring
lead for the DXP Plus to sense. If you set the incoming alert signal to its ring optional setting,
the DXP 
Plus detects tip-lead ground and then causes its ring generator to generate ringing tothe station being called. If you set the incoming alert signal to its ring required setting, the DXP
Plus waits until the CO applies the alternating voltage before the DXP Plus generates ringing tothe station. When a station answers the ringing, the circuit is completed as it is for outgoing
calls.Because ground start lines are controlled at both ends, they are capable of a release supervision
that provides a sure means of determining when a distant party hangs up his or her telephone.
This is very important in applications where the system costs the calls. Also, since the
signalling protocol indicates which end requests the line, it helps prevent call collisions and
glare and thus is useful in applications where there is a high volume of incoming and outgoing
calls occurring on the same lines.
Ground start lines are standard protocol for remote networking and are useful for connecting the
DXP Plus to private branch exchange (PBX) equipment. For ground start lines to be
dependable, you must ensure that you have connected the DXP 
Plus to a low resistan telephonecompany ground.
NOTE: The Federal Communications Commission (FCC) requires that you inform the central
ofJice that the DXP Plus is configured as an MF (multipurpose) registered device if youconnect it to ground start lines.
With ground start lines, set the following feature parameters:
- Incoming Alert Signal
qFor rinz reauired, the DXP Plus must detect a ring signal on the line before it will send aring signal to a station. This method is normally used with systems that use synchronized
ringing to prevent a long first ring.
0For r=inP ontional, the DXP Plus sends a ring signal to a station as soon as it detects aground on the tip lead of the line (put there by the calling equipment) or when it detects a
ring signal on the line. This method allows the station to receive a ring signal in less time
than the ring required method does; however, phantom ringing can occur on poorly
grounded lines or lines that fail from the CO.
- Dialing Mode
- Toll Groups
- Busy Lead
- voice mail ID
- Incoming Alert Signal
- DTMF Level
- Caller ID Active
- Line Group
Programming:Refer to Section 8.5. I.Line Features Programming 8-21 
						

							lMR%G123DXP PIws Programming hsfrwcfions
8.5. IGround Start Line Support ProgrammingProgramming: 
1 D
2.
3.
4.
5.
6.
7.
8.
9.
Press CONTROL T for main menu.
From the main menu, select lines and press ENTER.
From the lines menu, select line programming and press ENTER.
Type line port number l-240 or previously assigned name and press ENTER.
The system displays page 1 of the line programming menu.
From line programming menu, type item number for line type and press ENTER.
Press SPACE bar to toggle line type and press ENTER.
From line programming menu, type item number for another parameter and press ENTER.
Respond to prompt action for feature setting, and press ENTER to accept setting.
Repeat steps 7 and 8 for all required parameters.
10. Press CONTROL and type N and the system will display the menu page 2 of line
programming menu.
NOTE: The programming items shown on menu page 2 are for the line port type that you
selected in step 7. These items will be different for each line type.
11.
12.
13.
From menu page 2 of line programming menu, type item number for feature
and press ENTER.
Respond to prompt line action for feature setting, and press ENTER to accept setting.
From menu page 2 of line programming menu, repeat steps 1 I and 12 for
all required choices,
14.When finished, press ESCAPE twice.
15.Type y to accept changes, n to reject them, or r to resume editing and press ENTER.
16.Repeat steps for each line port or press ESCAPE to end.
8-22 Line Feafwres Programming 
						

							LOOD Start Line SumortDescription:The multipurpose line board provides system interface for loop start lines, ground start lines,
and E and M tie lines. These are typically the three different line types that the central office
(CO) makes available for connection to the public switched network. With the loop start line
type, the DXP Plus bridges a resistance across the tip and ring leads to signal the CO to
establish a communications link for an outgoing call. The CO detects the resulting current flow
and supplies dial tone to the DXP Plus. The CO signals an incoming call to the DXP Plus by
placing an alternating voltage (ring signal) on the tip lead for the DXP 
Plus to sense. The DXP
Plus then generates ringing to the station being called. When a station answers the ringing, the
circuit is completed as it was for outgoing calls. Loop start lines can not provide any sure
means of determining when a distant party hangs up his or her telephone. For a system that
experiences moderate incoming and outgoing call volume and does not cost calls, loop start
lines provide an economical choice for connecting the DXP 
Plus to the central office (CO)
equipment. When you use line 1 for the power-fail mode, you must program that line to be a
loop-start line unless the industry-standard telephone that you use as a power-fail station is a
ground-start device.
With loop start lines, set the following feature parameters:
- Dialing Mode- Abandon Hold Release- Positive Disconnect Time
- Toll Groups- DTMF Level- Busy Lead
- Disconnect Supervision- Caller ID Active- Voice Mail ID
- Line Group
Programming:1.Press CONTROL T for main menu.
2.From the main menu, select lines and press ENTER.
3.From the lines menu, select line programming and press ENTER.
4.Type line port number l-240 or previously assigned name and press ENTER.
The system displays page 1 of the line programming menu.
5.From menu page 1 of line programming menu, type item number for line type
and press ENTER.
6.Press SPACE bar to toggle line type (choose loop start, ground start, or E and M tie line)
and press ENTER.
7.From menu page 1 of line programming menu, type item number for another line
parameter, press ENTER.
8.Press SPACE bar for feature setting, and press ENTER to accept setting.
9.From menu page 1 of line programming menu, repeat steps 8 and 9 for all required choices.
10. Press CONTROL and type N and the system will display the menu page 2 of line
programming menu.NOTE: The programming items shown on menu page 2 are for the line port type 
that you
selected in step 7. These items will be different for each line type.
11.From menu page 2 of line programming menu, type item number for feature
and press ENTER.
12.Press SPACE bar for feature setting, and press ENTER to accept setting.
13.From menu page 2 of line programming menu, repeat steps 11 and 12 for
all required choices.
14.When finished, press ESCAPE twice.
15.Type y to accept changes, n to reject them, or r to resume editing and press ENTER.
16.Repeat steps for each line port or press ESCAPE to end.
Line Features Programming 8-23 
						

							IM166-123DXP Plus Programming hstruetions
8.7Pie Line Support
The multipurpose line board provides system interface for loop start lines, ground start lines, and E and M tie
lines. These are typically the three different line types that the central office (CO) makes available for connection
to the public switched network. The tie line connections (also known as tie trunk access) are special circuits that
allow, on either a dial-up or a continuous connection (hot line) basis, the DXP 
Plus to communicate with remotely
located equipment such as: another DXP Plus, a PBX, or other common carrier (OCC) equipment for long
distance calls.NOTE: Tie lines are primarily for incoming calls to a 
DXP Plus and depend upon sofiare controlling
the remote site.
Tie lines can be a part of a private or leased network and can be metallic, carrier current, Tl, or microwave. The E
and M line provides control signalling between local and remote systems. When a local DXP Plus puts a request
for service on the M lead, the remote equipment detects this request on its E lead. As an option it can also respond
by putting an alerting signal on its M lead.
8.7.1Tie Line Paramefers
Tie Line Types (Connect Mode)
Description:The DXP Plus supports two different types of E and M lines.The E and M Direct type is for
direct connection between two telephone systems and is also known as a metallic connection.The E and M Carrier type is for tie lines that run through a central 
off%ze (CO) interface;
however, some 
COs also provide a metallic connection interface.
Programming:Refer to Section 8.7.2.
Tie Line Standard-Protocol Signalling (Control Signalking)
Description:
The system can respond to either one of three different standard-protocols of E and M signalling. They are known
as: immediate signalling, 
wink signalling, and delayed signalling. You must program the desired protocol type to
match that provided by the CO or the remote equipment.
Immediate Signalling: With this signalling method, the called DXP Plus answers as soon as the calling DXP
Plus initiates the call. This signalling method is usually used if the line is programmed for hot line operation or is
programmed for pulse dialing. It is best to avoid this type of signalling in any other circumstances.
Wink SignaIling: With this signalling method, the called DXP Plus places a momentary signal reversal (wink) on
its M lead to alert the calling DXP 
Plus system that it is ready to receive information The calling DXP Plus
controls the status of the M lead and watches for a return signal from the called DXP Plus on the E lead. A wink
occurs when the called DXP 
Plus is ready to receive dialed digits from the calling DXP Plus. Dialing can begin
only after the wink is complete. After the wink occurs, the called DXP 
Plus (if it is programmed for dialing)
returns dial tone to the calling DXP 
Plus as an indication it is ready to receive digits. This signalling method is
the preferred protocol for use between two DXP Plus systems.
Delayed Signalling: With delay dial signalling, the called DXP Plus immediately responds to the calling DXP
Plus by sending an off-hook signal on its M lead. It holds this off-hook condition until it is ready to receive digits
and then returns its M lead to on-hook. After this signal exchange occurs, the called DXP Plus (if it is
programmed for dialing) returns dial tone to the calling DXP Plus as an indication it is ready to receive digits.
This signalling method is most useful if the DXP 
Plus is connected to another manufacturer’s PBX with
incompatible wink timing parameters.Programming:
Refer to Section 8.7.2.8-24 Line Features Programming