work that
provides preemption capabilities for calls related to na-
tional defense.
The DSN interface, when added to a PBX (Private
Branch Exchange), allows attendants and other users of
the system to enter the military network by dialing an
access code. Users can get assistance on outgoing DSN
calls by dialing an attendant-assistance code.
Calls on the DSN network may be precedence or non-
precedence calls. Precedence calls are routed over
trunks called precedence capable trunks. These calls
can be routed through the network without attendant
assistance.
Characteristics
of the Network
DSN Network has the following characteristics that dis-
tinguish it from other types of networks:
A numbering plan that defines 7 digit dialing for DSN
calls inside a system and 7 or more digits for DSN calls
outside a system.
DSN calls carry with them one of five precedence levels:
1]
Routine
2]
Priority
3]
Immediate
4]
Flash
5]
Flash Override
Calls of one precedence level may be preempted auto-
matically or manually when a call of a higher prece-
dence level is attempting completion.
Incoming precedence calls to an extension that does not
answer in a specified period of time (from 10 to 60 sec-
onds) are routed to an extension available 24 hours a
day. The extension must then attempt to complete the
call. 3
Model DSN100
Terms used with
the DSN Network
The following terms are used in this guide and/or other
DSN documentation; they should be familiar to all DSN
users.
Preemption - the disconnecting of an established call
and re-seizing of the same line or trunk by a call of a
higher precedence level when no idle circuit is available
to complete the higher precedence call.
Precedence - a rank assigned to indicate the degree of
preference to be given in processing and protecting DSN
calls; originators of precedence calls may elect to use their
highest authority level or any lesser precedence level.
Flash Override (FO) -
the highest precedence level for
DSN calls.
Flash (FL) - the second highest ranking precedence level
for DSN calls.
Immediate (IM) - the third highest ranking precedence
level for DSN calls.
Priority (PR) - the fourth highest ranking level for DSN
calls.
Routine (RT) - the lowest ranking precedence level for
DSN calls.
Dial Service Assistance (DSA) operator - an operator
associated with DSN switching center who provides serv-
ices such as information, interception, random
conferencing, and precedence calling assistance to PBX
attendants on DSN calls.
Programming
the DSN-100
To program setup information into the DSN-100, it will
be necessary to make all cross connections and to pro-
gram trunk translations in the PBX. See examples of
PBX translations for analog interface.
After all other work is complete, plug in the power sup-
ply. Note! PBX ground must be connected to the com-
mon ground of the power supply. The amber led la-
beled "program" should blink if the unit is new. If it
was previously programmed the green "idle" led will be
blinking. In that case, momentarily push the recessed
program switch labeled "pgrm mode". Before program-
ming, it will be necessary to have the following informa- 4
Avaya Communication
tion available:
1]
Is the trunk precedence inward ?
2]
Is the trunk precedence outward ?
3]
Don't answer transfer time.
4]
Number of digits in dial plan.
5]
Transfer station number.
Remove the FAC plug from the DSN-100. If the unit was
wired to it's 56 pin connector, temporarily remove the
"M" signaling wire (pin 40). From a touch tone phone,
dial the trunk access code. After the unit answers, enter
the following information in the exact order.
1]
Precedence in Yes = 1 No = 0
2]
Precedence out Yes = 1 No = 0
3]
Transfer time 01 - 99 seconds (Must be 2 digit)
4]
Number of digits in dial plan (3, 4, 5)
5]
Transfer station number (Not "0")
6]
" # " ends programming session.
Example: 1, 1, 30, 4, 2006, #
Precedence in, precedence out, 30 second transfer, 4
digits in dial plan, 2006 call coverage number.
After all information has been entered and the trunk re-
turned to idle, the "program" led will turn off and the
"idle" led will blink.
Answering an incoming
precedence call
Precedence calls normally come directly to voice termi-
nals in the PBX rather than to attendant consoles. How-
ever, when an incoming call to a voice terminal cannot
be connected within some preset period (30 seconds is
a typical value), the call is routed to another voice ter-
minal to be answered. The procedure for answering a
precedence call at a console is the same as for any
other type of call.
Placing an outgoing
precedence call
An attendant or a voice terminal user can place a prece-
dence level call in accordance with local practices. To
place a call, the user must dial the DSN trunk access
code followed by the precedence level requested and
the DSN phone number (7 to 10 digits). It is not neces- 5
Model DSN100
sary to have a special 16 button dial to place prece-
dence level calls. The precedence numbers and their
corresponding levels are as follows:
4 - Routine (RT)
3 - Priority (PR)
2 - Immediate (IM)
1 - Flash (FL)
0 - Flash Override (FO)
A user must dial a precedence level on all calls using a
precedence trunk, even routine calls. The ability of PBX
users to place calls can be controlled via class of service
and trunk restriction.
A voice terminal user who gets busy tone after placing
an outgoing precedence call should hang up, and then
call the local attendant for assistance. The attendant may
be able to place the call on a higher precedence level
trunk than a voice terminal user can access. The atten-
dant may also use voice pre-emption to request use of a
trunk.
Specifications
SIZE ............................. 6.12"L x 1.44"W x 5.63"H
WEIGHT .............................................. 6.2oz
OPERATING VOLTAGE .................................. -48VDC
POWER CONSUMPTION: ................................... 50mA
6
Avaya Communication


-48V
-48V


TOUCH TONE
PROGRESS TONE
GENERATOR
103
BLOCK
FAC
3
4
5
1
2
6
46
44
50
48
40
42
56 PIN
CONN
K3
K2
DETECTOR
TT
TR
M
RT
RR
E
DSN-100
FAC E
FAC M 7
Model DSN100
Wednesday, July 31, 1996
DSN_100.S1
AUTOVON TRUNK CIRCUIT
Lucent Technologies
A
1
1
Title
Size
Document Number
Rev
Date:
Sheet of

-48V



103
BLOCK
TOUCH TONE
RECEIVER
PBX
5
3
4
1
2
6
7
8
56 PIN
CONN
32
30
28
26
36
34
1&2
3&4
K1
DETECTOR
TT
TR
RT
RR
E
M
PBX-M
PBX-E 8
Avaya Communication
Published with permission on
31-May-01 for Avaya Communication.
Tie Trunk Transla-
tions

Trunk Group Page 1

Group Number:** Group Type:tie CDR Reports:*

Group Name:DSN Precedence Cor:1 N:___ TAC:**

Direction:two-way Outgoing Display:Y Trunk Signal Type:___

Dial Access:y Busy Threshold:99 Night Service:___

Queue Length:0 Incoming Destination:___

Comm Type:Voice Auth Code:n

Trunk Parameters

Trunk Type(in/out):wink/wink Incoming Rotary Timeout(sec):5

Outgoing Dial Type:tone Incoming Dial Type:tone

Wink Timer:300 Disconnect Timing(msec):250

Digit Treatment:___ Digits:___

Signal Bit Inversion:none

Connected to Toll? n STT Loss:normal DTT to DCO Loss:normal

Incoming Dial Tone? n
Answer Supervision Timeout:10

Trunk Features Page 2

ACA Assignment? N

Measured:none Internal Alert? n

Used for DCS? n Data Restriction? n

Maintenance Tests? n Glare Handling none

Supress # Outpulsing? n


Page 3
Use all default values


Page 4
Trunk Groups

Group Member Assignments

Port Name
Night
Mode Type
Ans Delay

1:xxxx DSN Precedence
E&M T1 stan

2:

3:

4:

5:

6:

7:

8:
9: