Comdial Dxp Plus Instructions Manual

							T1003A
Front View of Main Connector
On DXPT1 Board
1R1
RC1
ReceiveC1
Transmit
T1
T 2
3
4
5
6
7
8
Connecting The ISDN–PRI Line To the T1/PRI Board
Installing And Programming The DXPRI Card IMI89–255
Connecting The ISDN–PRI Line To The System – 25 
						

							Programming The System For ISDN–PRI Application
To arrange the DXPPlussystem for ISDN–PRI operation, you must take the following programming actions:
·Use Board Configuration programming to program the ISDN service features.
·Use Line programming to make every ISDN line a PRI B Channel line type and make the DID/DNIS
programming choices.
·Use Line Group programming to group together the lines that correspond to the T1/PRI channels.
·Use Station programming menu to program the specific ISDN requirements in addition to the other station
programming needs.
·Use Button Mapping programming to map a restrict button on the ISDN station.
·Use Features Numbering to add dialing codes for two ISDN-specific features.
Board Configuration
When you add a T1/PRI board in a common equipment cabinet board slot, that slot becomes programmable, and
you can make several programming choices that affect ISDN–PRI service.
Protocol—With the Protocol feature, match the software to the central office (CO) switch type. The switch types
that the software supports include the following items:
4ESS(AT&T* 4ESS switch protocol)
5ESS(AT&T* 5ESS switch protocol)
DMS100(Northern Telecom** DMS100 switch protocol)
* Lucent Technologies, Murray Hill, NJ 07974
**Northern Telecom Limited, Richardson TX 75082
Default Number—This feature allows you to select a default value for the Calling Number ID. The system uses
this number to identify the calling party in the following cases: when you use the Calling Number ID Mode
feature to specify board level identification, when you do not program a calling number identification for a station
(see Station Programming for details), and when the call is a line-to-line call through the system.
Calling Number ID Mode—This feature allows you to set calling number identification at either a board level or
a station level. The selections include the following choices:
Default Number(selects board level identification such as the company’s main number)
Station Number(selects station level identification—requires that you program the Outbound
Calling Number ID and Station ID features in Station Programming)
Default With Station ID(future feature—selects board level identification for the calling
number ID plus the station ID if available.)
NFAS Membership Mode—Use this feature to specify a board’s role in a NFAS group.
Non-Member(specifies independent, stand-alone DXPT1–PRI board)
Member(specifies DXPT1–NFAS board with D-channel signalling provided by another board)
Primary(specifies DXPT1–PRI board that provides D-channel signalling for the NFAS group)
NOTE: When you are using Visual Man-Machine Interface (VMMI) to program, the system automatically applies
the Member setting where appropriate.
IMI89–255 Installing And Programming The DXPRI Card
26 – Programming The System For ISDN–PRI Application 
						

							Primary D-Channel Board—Designate the board that provides the D-channel signalling for a NFAS group with
this programming feature. Make the same designation for every board in a NFAS group including the primary
board.
NOTE: When you are using Visual Man-Machine Interface (VMMI) to program, the system automatically applies
the Primary D-Channel Board setting where appropriate.
Interface Number—If you select any item except non-member for the NFAS membership mode, you must enter
the CO-supplied group interface number for each board in a NFAS membership group
NFAS Group Members—If the board that you are programming, is the controlling board in a NFAS group, use
this feature to designate the controlled NFAS members in the group. The list can include up to four controlled
members but must not  include the primary or controlling board.
NOTE: When you are using Visual Man-Machine Interface (VMMI) to program, select NFAS Group Members
from a list of NFAS boards that are not assigned to any other group.
To understand how to program a NFAS group list, consider the example that follows below.
Assume the following parameters:
·a CO has a DMS 100 switch that provides your system with five T1 circuits configured for NFAS service,
·the CO representatives identify each circuit and specify interface numbers as 0 through 4 with interface
number 0 providing the D-channel for signalling,
·you’ve connected the T1/PRI circuits to boards five through nine in ascending slot order,
·the system requires station level calling party identification and that the main number is 804–555–1234.
For these parameters, you must program the boards to match the chart detailed below.
Logical Board
Number56789
Board TypeDXPT1–PRI DXPT1–NFAS DXPT1–NFAS DXPT1–NFAS DXPT1–NFAS
ProtocolDMS 100
Default Number8045551234
Calling Number ID
ModeStation Number
NFAS
Membership ModePrimary
Primary
D-Channel Board55555
Interface Number01234
NFAS Group
Members6, 7, 8, and 9
Installing And Programming The DXPRI Card IMI89–255
Programming The System For ISDN–PRI Application – 27 
						

							Line Programming
Conditioning a line port as PRI B Channel.
When you plan for a line to provide ISDN–PRI service, you must program it to be a PRI B Channel line. The
system automatically defaults to this programming setting for any lines that you assign to a T1/PRI board. With
the line conditioned to be a PRI B Channel line, you must set the DID/DNIS parameters for the line.
Making The DID/DNIS Programming Choices
The common carrier supplies DNIS information as DTMF digits. When the DNIS feature is combined with the
Automatic Number identification (ANI) feature, the common carrier delimits the ANI information from the DNIS
routing information with the asterisk (S) tone so that the system can process each portion properly.
The system uses information that you program in the DID/DNIS translation table to route the call to the proper
intercom number. The system also sends the called number information to the SMDR/SMDA line report and
makes the information available to devices that are connected to the Open Architecture Interface (OAI).
As a single service, if the call routes to an LCD speakerphone, the speakerphone’s display shows the name that
you programmed in the DID/DNIS translation table. If you have programmed no name there, the display shows
the DNIS/DID block name that you assigned to the DID/DNIS block. If you have programmed no name there, the
display shows the processed DNIS digits. (As a DNIS/ANI combined service, the display shows the processed
ANI digits.)
DID/DNIS Block Name—Choose a 7-character name to associate with each DID/DNIS block. 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.
.
Endthe 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.
Expected CO Digits—Type quantity (0–7) of digits and press ENTER.
Obtain a block of numbers for use from the CO. The system 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.
You will derive maximum user convenience if you choose the CO block to match the intercom numbers
that you have assigned to the 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, which
covers 1000 through 1399. If the CO block was 555–1100 through 555–1192, the string quantity would
be two, which covers 00 through 480.
ANI Delivery—Press SPACE bar for Yes or No and press ENTER.
Enable or disable the system to process ANI information that is delivered by the long distance common
carrier as a T1 feature on dial 800 and dial 900 lines.
Information Digits—This option does not apply to T1/PRI. Be sure it remains disabled.
IMI89–255 Installing And Programming The DXPRI Card
28 – Programming The System For ISDN–PRI Application 
						

							DISA Voice Options—Type DVA message identification number (1–4) and press ENTER.
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.
Alternate Routing—Type intercom number (up to four digits) for station to handle misdialed calls.
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.
Ring Code—Type code (1–8) to specify the ringing pattern for calls to the alternate station.
CFOS Enable—Press SPACE bar for choice and press ENTER.
Use this selection to enable Call Forward Outside System for this DID line block. CFOS allows the
system to forward incoming or transferred line calls to telephone numbers that are outside the system.
NOTE: If you save the changes and you have changed the expected digits value, additional prompts may appear.
Configuring The DID/DNIS Translation Tables
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 Digit 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.
Day 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/DNISwill not
support Delay Ring, Day 1 ring, or Day 2 ring modes.
Night 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.
Ring 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.
Installing And Programming The DXPRI Card IMI89–255
Programming The System For ISDN–PRI Application – 29 
						

							Line Group Programming(For ISDN–PRI Service)
When you provide ISDN–PRI service to system stations through a T1/PRI connection to the central office (CO),
you should do so through line group access rather than individual line connections. Remember, one T1/PRI
connection to the system yields 23 channels for communications to and from the stations (24 channels for
DXPT1–NFAS boards). While these channels correspond to line ports within the system, line designations such
as Line 1, Line 2 and so forth are meaningless for the T1 board’s CO connection designation. When the T1/PRI
board is called upon to pass an incoming or outgoing call between a station and the CO, it can do so through any
of the available channels. Having the system choose the channel is the most efficient method for call completion.
To best effect this, program the line ports that correspond to the 23 voice channels (plus 24 voice channels for
each DXPT1–NFAS board controlled by the D channel) into one line group, and assign that line group to the
stations that are to have ISDN–PRI service.
During operation, the system searches for an idle line in the line group in the same order that you program them
using this procedure.
Station Programming
In addition to the many other features that you can assign to a station, there are several features that are specific to
ISDN–PRI service.
Signal Type
The Signal Type feature selects the information transfer capability that the system requests during call setup for a
specific station port. The signal types that you can select include the following items:
Speech—digitized speech only–allows analog transmission, echo cancellation, and time-assigned
speech interpolation, (suitable for speech only)
3.1 Khz Audio—3.1 Khz digitized audio–allows analog transmission but does not
allow speech processing (suitable for modems),
56 Kbps Digital—56 Kbps digital data rate adapted to 64 Kbps (future feature),
Restricted Digital—64 Kbps digital data that is restricted so that there is no 8-bit zero
pattern allowed in any time slot (future feature),
Unrestricted Digital—64 Kbps digital data with no restriction on bit pattern (future feature).
Outbound Calling Number ID
The Outbound Calling Number ID feature allows you to choose the caller ID number that will identify the calling
station to a distant party. Usually you should set this feature if you specify station level identification as the
Calling Number ID ModeinBoard Configuration Programmingunless you want the default number to go out
instead (for example, for a shared telephone in a common area).
IMI89–255 Installing And Programming The DXPRI Card
30 – Programming The System For ISDN–PRI Application 
						

							Station ID(future feature)
The system can transmit a Station ID using ISDN display and/or sub-address messages. The system transmits the
station ID when you choose eitherstation numberordefault with station IDinBoard Configuration
Programming. This feature, when supported by the central office equipment, includes a station’s full name or
extension number as additional caller ID information. You can choose three different ID types:
None—no station ID information supplied for this station,
Extension—station’s extension number supplied,
Full Name—station’s full name field supplied.
Button Mapping
When you assign station leveloutbound calling number IDto a station throughStation Programming, it is a good
practice to also map a RESTR (restrict) button on the station. By pressing the
RESTRbutton, the station user can
block the outbound calling number ID whenever needed. Once enabled, the restriction remains in effect until
deactivated.
Remember, you can assign feature functions at a first level or at a second level at each button. If a function
requires status light feedback, assign that function to the first level because the system does not provide status
light feedback to buttons at the second level (press CONTROL N to display the second level).
Feature Numbering
Dialing codes for user features are flexible so that you can renumber them. This may be necessary if site
requirements dictate that personal or group intercom numbers fall within a certain block or sequence. Since new
number assignments can not conflict with existing numbers, the system provides a block of unassigned numbers
that you can use for renumbering. At default, the system assigns blocks of numbers in the following ranges:
1001–1480 = personal intercoms,
4001–4480, 5000–5039 = group intercoms,
5040–5999 = unassigned,
600—899,T, # = feature codes
9 = line group 1
There are two features used with ISDN–PRI service that have no defaulted dialing code. Use this procedure to
assign dialing codes to these following features:
Signal Type—By providing a dialing code, you provide users with the ability to select the station’s signal type.
For example, a modem might dial the feature code for 3.1 Khz audio prior to making a data call and then return
the station to speech after the data call is complete.
Restrict Calling Number ID—By providing this code, you give users the ability to block outgoing Calling
Number ID information. Even though they block the information with this code, the system still transmits the
information but it tags it as restricted. This restriction tag prevents the called party from receiving the ID data
unless they are an emergency services provider (such as 911) or are paying for the call (such as a 1–800 number
provider). Once enabled, the restriction remains in effect until deactivated.
CAUTION
If a number conflict exists, the system will prompt you to remove the conflict. Before responding to this
prompt with a y (yes), be sure that doing so will not disturb other programmed features that depend upon
the removed extension number. It is possible to create a situation where you must make several
renumbering changes to completely resolve a number conflict.
Installing And Programming The DXPRI Card IMI89–255
Programming The System For ISDN–PRI Application – 31 
						

							Understanding The T1/PRI Alarms And Indicators
Most of the T1 alarms and indicators (LEDs) are located on the front-edge panel of the T1/PRI board, while
several are located on the front edge of the DXOPT-SYN card. The following sections discuss the alarms and
indicators.
NOTE: Red /Yellow LEDs, when lit, indicate errors or non-standard configuration for normal operation.
T1/PRI Board Indicators
Red Alarm (red LED)When this LED indicator is lit, the system cannot establish communications with
the network.
Yellow Alarm (yellow LED)The yellow alarm is lit whenever the far end has lost synchronization to its
incoming signal. This alarm indicates a transmit problem..
Sync Alarm (red LED)This LED (labeledSYNC LOSS), when lit, indicates that the frame bit in the
received data cannot be found. this alarm indicates a receive problem.
Signal Alarm (red LED)The signal alarm (labeledSIG LOSS) turns on to indicate that the DXPPlushas
lost its incoming signal. This alarm indicates a receive problem.
Blue Alarm (red LED)When this alarm indicator is lit, the alarm indication signal (AIS) consisting of
all one (1) bits is being received to indicate that the far end has lost its received
signal. The purpose of this signal is to maintain the system clocks during a link
failure. This alarm indicates a transmit problem.
Bipolar Alarm (red LED)The system converts the digital bit stream in T1/PRI communications to a bipolar
format through a process called alternate mark inversion (AMI). The voltage
polarity of the ones pulses (marks) alternates between plus and minus with a zero
(space) represented by no pulse. A bipolar violation occurs whenever two
successive pulses are of the same polarity. This alarm LED indicates a bipolar
violation (BPV) has occurred. It is important to note that BPV errors are not
passed through regeneration points. This alarm indicates a receive problem.
Cyclic Redundancy
Check (red LED)The cyclic redundancy check (CRC) indicator turns on whenever there is a
discrepancy in the check sum received for an incoming frame from the
originating system and the locally calculated check sum. This discrepancy
indicates a data error in the received frame. The CRC is enabled by DIP switch
SW2-4. This light indicates a receive problem.
Slip (red LED)This indicator is turned on whenever a frame slip is detected. This is caused by
the transmit clock not being synchronized with the receive clock. This light
indicates a synchronization problem.
Unlock (red LED)The transmit frequency (1.544 Mhz) is not locked with the receive clock when
this indicator is lit.
B8ZS)/COFA (green LED)This is a dual-purpose indicator. Depending on how you set DIP switch SW2–6,
this indicator reports either a change of frame alignment (COFA) at
re-synchronization time (default setting) or bipolar 8-zero substitution (B8ZS)
code words detected in the received data.
RLB, LLB, and
PAYL (red LEDs)Whenever a loop back routine is active, either the remote loop back (RLB), local
loop back (LLB), or payback loop back (PAYL) mode (selected by DIP switches
SW2-7 and SW2-8) is indicated by the appropriate LED being lit.
IMI89–255 Installing And Programming The DXPRI Card
32 – Understanding The T1/PRI Alarms And Indicators 
						

							DXOPT–SYN Board Indicators
PRI and SEC (green LEDs)ThePRIandSECLEDs on the DXOPT-SYN card light to indicate where the
receive clock reference is originating from—the primary or secondary DXPT1
board location. When two or more DXPT1 boards are installed, you make the
primary and secondary assignments via  jumpers on the the DXAUX board. If
only one DXPT1 board is installed, you can set the jumpers so that both LEDs
will light.
UNLOCKED (red LED)When lit, the Unlocked LED indicates either that the straps on the Auxiliary
board are set incorrectly, that the DXOPT-SYN card is defective, that the receive
frequency is out of tolerance (1.544 Mhz±200 Hz), or that no valid ISDN–PRI
line is connected..
MANUAL (red LED)This LED, when lit, indicates that the manual mode has been selected via the
AUTO/MANUALmode switch on the DXOPT-SYN card. When you select the
manual mode (normally for maintenance/troubleshooting ), you can select either
the primary or secondary timing reference by setting thePRI/SECswitch on the
DXOPT-SYN card. For normal operation, select the automatic mode. Do not
manually force the clock reference to primary or secondary if the appropriate
green LED is not lit. This will cause the VCO oscillator to default to its
minimum or maximum tolerance, and the T1/PRI board(s) will not
frequency-lock.
Installing And Programming The DXPRI Card IMI89–255
Understanding The T1/PRI Alarms And Indicators – 33 
						

							Viewing The Alarms And Indicators
T1PRI Board (In order From top to bottom)
LED*LabelError Or Status Condition When Led Is Lit
l(Status) Rapid flash = defective board
Steady on = board in wrong slot or board constraints violated
Off with repeated five second blink on = normal operation
(T1 trunk idle)
On with repeated five second blink off = normal operation
(T1 trunk busy)
lRed Communications with network cannot be established
(out-of-service)
¤Yellow Network unable to frame sync to DXP Plus
lSync T1/PRI Board unable to frame sync to Network
lSIG Loss of incoming signal
lBlue Alarm indication signal (AIS) being received (indicates loss
of signal at far end)
lBipolar Bipolar violation detected
lCRC Cyclic redundancy check error in incoming frame if SW2-4
is enabled
lSLIP Frame slip detected (check DXOPT–SYN settings)
lUnlock Transmit frequency (1.544 MHz) not locked
with receive clock (check DXOPT–SYN settings)
¡B8ZS/COFA B8ZS/COFA (B8ZS zero suppress mode/change of frame
alignment) per SW2-6
lRLB Remote loop back active
lLLB Local loop back active
lPAYL Payload loop back active
¡Signalling message from DXP
¡Signalling message to DXP
¡Future feature–T1/PRI in network mode
¡Not currently defined
¡Not currently defined
¡On = D channel (layer 2) is down
¡D channel message to network
¡D channel message from network
Synchronization Card
LED*LabelError Or Status Condition When Led Is Lit
¡PRI Timing reference is present from the T1/PRI primary board
¡SEC Timing reference is present from the T1/PRI secondary board
lUNLOCKED Trouble (defective DXOPT–SYN card or receive frequency
out of tolerance (1.544 MHz ± 200 Hz))
lMANUAL The manual mode is active for selecting the T1/PRI reference
NOTE: Red /Yellow LEDs, when lit, indicate errors or non-standard configuration for normal operation. Green
LEDs indicate a normal condition.
*LED color legend
l= Red¤= Yellow¡= Green
NOTE: Diagnostic LEDs display PRI
layer 2 (D channel) activity
when you set the diagnostic
switch to 00100000. Other
switch settings cause factory
test diagnostic codes to be
displayed. Refer to the
discussion titled,Configuring
The T1/PRI board.
IMI89–255 Installing And Programming The DXPRI Card
34 – Viewing The Alarms And Indicators