Lucent Technologies Definity Audix System Release 4.0 Pocket Reference Manual

							Capacity and Sizing 
3-1
Voice Ports 
DEFINITY AUDIX System Release 4.0
System Description Pocket Reference  585-300-214  Issue 1
May 1999
Chapter 3 — Capacity and Sizing
Luc ent Tec hnolog ies c onfigures the DEFINITY AUDIX system’s c ap ac ity 
ac c ording to the c ustomer’s requirements for the system’s resourc es.
Customers are divid ed  into two c ateg ories of system use:
nBasic usage c ustomers use the DEFINITY AUDIX system mainly 
for call coverage.
nAd vanc ed usag e c ustomers use the system to c reate and  send  
messages in add ition to c all c overage.
Whether c ustomers use the system for c all c overage or voic e mail, their 
req uirements for system resourc es c an b e d ivided into five add itional 
c ateg ories—lig ht, med ium, heavy, very heavy, and  extremely heavy. The 
values of two variab les b road ly determine c ustomers’ system 
req uirements:
nMinutes of voic e p ort use p er sub sc rib er p er d ay
nMinutes of voic e storag e req uired  for eac h sub sc rib er
Tab le 3-1
 shows the c ategories of users and  their average req uirements 
for voic e p orts and  voic e storage.
Vo i c e  P o r t s
Luc ent Tec hnolog ies c onfig ures voic e p orts for the DEFINITY AUDIX 
system in two-port inc rements. Customers c an p urc hase four, six, or 
eig ht voic e ports with Dig ital Networking, or up to12 voic e ports without 
Digital Networking. Luc ent Tec hnolog ies ships the system with four 
voic e p orts unless the c ustomer ord ers ad d itional p orts.
The DEFINITY AUDIX system’s voic e port c ap ac ity is measured in 
Erlang s. An Erlang  is a mathematic al rep resentation of one b usy p ort. 
The numb er of Erlang s a system c an c arry eq uals the averag e numb er 
of ports in use. The number of Erlangs the system c an c arry will vary 
ac c ording to its Grade of Servic e (GOS). 
Table 3-1. Average System Requirements per Subscriber
Daily voice port 
usage (Minutes)Basic voice storage 
(Minutes)Advanced voice 
storage (Minutes) 
Light21.32.0
Medium41.92.8
Heavy62.33.4
Very heavy82.63.9
Extremely heavy10 3.0 4.5 
						

							DEFINITY AUDIX System Release 4.0
System Description Pocket Reference  585-300-214  Issue 1
May 1999
Capacity and Sizing 
3-2 Voice Ports 
The system’s GOS rep resents the frac tion of c alls to the p ort g roup  that 
are d elayed  more than 10% of the leng th of an averag e session d uring  
the b usiest hour of the day. Session times vary with subsc rib ers’ feature 
use, b ut session times average 60 to 100 sec onds when all sub sc ribers 
ac c ess features throug h a sing le port g roup. All servic es on the system, 
suc h as Automated  Attend ant, Call Answer, Voic e Mail, and Bulletin 
Board , usually share the voic e p orts.
Ta b l e  3 - 2
 lists the DEFINITY AUDIX system’s port c ap ac ities in Erlang s 
at .01 to .10 GOS . 
Two examp les from Ta b l e  3 - 2 will help demonstrate the sig nific anc e of 
using  Erlang s to c omp are voic e p ort GOS. 
A system with a voic e p ort c ap ac ity that falls in the top  left c ell of the 
table would  have 4 ac tive voic e p orts on the DEFINITY AUDIX system. 
Op erating  at .01 GOS, only 1% of the c alls to those 4 p orts would  b e 
d elayed  long er than10 sec ond s d uring  the b usiest hour of the d ay. Thus, 
the system would  b e op erating  at 0.89 Erlang s, whic h means that an 
average of 0.89 of the customer’s 4 voice p orts would b e in use at any 
one time. In this c onfig uration, all c allers would  b e assured  an op en 
voic e p ort to the DEFINITY AUDIX system.
On the other hand , a system whose voic e p ort c apac ity falls in the 
b ottom right c ell of Ta b l e  3 - 2
 would  have 12 ac tive voic e p orts on the 
DEFINITY AUDIX system. This system would be op erating  at .10 GOS, 
meaning  that 10% of the c alls to the voic e p orts would  b e d elayed  more 
than 10 sec ond s d uring the busiest hour. The system would  then be 
op erating  at 8.08 Erlang s, meaning  that an averag e of 8.08 of the 
c ustomer’s 12 voic e p orts would  be in use at any one time. In this 
c onfig uration, most c allers c ould ac c ess one of the DEFINITY AUIDX 
system’s voic e p orts. But at times when use is unusually heavy, some 
subsc rib ers may have to wait for servic e.
Table 3-2. Port Capacities in Erlangs
GOS
.01 .02 .03 .04 .05 .06 .08 .10
40.89 1.09 1.22 1.34 1.43 1.51 1.65 1.78
61.92 2.24 2.44 2.60 2.74 2.86 3.06 3.22
Ports 83.14 3.53 3.81 4.00 4.17 4.33 4.58 4.78
104.44 4.92 5.25 5.50 5.69 5.89 6.17 6.42
125.83 6.39 6.78 7.06 7.28 7.47 7.81 8.08 
						

							DEFINITY AUDIX System Release 4.0
System Description Pocket Reference  585-300-214  Issue 1
May 1999
Capacity and Sizing 
3-3 Voice Ports 
Understand ing the port c ap ac ities for the DEFINITY AUDIX system 
Release 4.0 will help c ustomers d ec ide whic h p ort p ac kages are right 
for their org anizations’ needs.
Features that Affect Voice Ports
Some of the DEFINITY AUDIX system’s features c an p lac e varying  
d emand s on the system’s resourc es. Among  those features that have 
unique req uirements for voic e p orts are Outc alling , Automated  
Attend ant, and  Broad c ast Messag ing . The DOSS c onfig urator—Luc ent 
Tec hnolog ies’ system for c onfig uring  p rod uc ts ac c ord ing  to c ustomers’ 
need s—c alc ulates the requirements for these features individ ually. It is 
p artic ularly important for c ustomers who spec ify their voic e p ort 
req uirements to und erstand  these d emand s so they c an ac c urately 
p red ict their systems’ performance.
Outcalling
For Outc alling , the DOSS c onfig urator uses the following estimates to 
c alc ulate voic e p ort req uirements:
nThe total numb er of outc alls d uring  the b usiest hour of the d ay
nThe frac tion of total outc alls that g o to a p ag er
The DOSS c onfig urator also assumes the following : 
nA suc c essful outc all takes 15 sec onds; an unsuc c essful outc all 
takes 60 sec ond s.
n50% of outc alls that d o not go to a p ag er are suc c essful.
nThe switc h treats all outc alls that go to a p ag er as unsuc c essful.
Automated Attendant
For Automated  Attend ant, the DOSS c onfig urator uses the following  
estimates to c alc ulate voic e p ort req uirements:
nThe numb er of Automated  Attend ant c alls d uring  the b usy hour 
nThe holding  time p er c all
Broadcast Messaging
For Broad cast Messaging, the DOSS c onfigurator uses the following  
estimates to c alc ulate voic e p ort req uirements:
nThe total numb er of b road c ast messag es the c ustomer 
org anization g enerates per d ay
nThe averag e leng th of a b road c ast messag e in sec ond s 
						

							DEFINITY AUDIX System Release 4.0
System Description Pocket Reference  585-300-214  Issue 1
May 1999
Capacity and Sizing 
3-4 Voice Storage 
Digital Networking
Using Dig ital Networking  reduc es the system’s maximum number of 
voic e p orts from 12 to 8. Customers who need  Dig ital Networking  and  
more than 8 voic e p orts should  c onsid er using  an I
NTUITY messag ing 
system. For more information about the INTUITY messag ing  system, see 
INTUITY Messag ing  Solutions.
AMIS Analog Networking
While Digital Networking uses the Digital Networking port to send  
messages to remote subsc rib ers, AMIS Analog  Networking uses voic e 
p orts to send messag es with the Message Delivery feature. AMIS 
Analog  Networking d oes not red uce the total number of voic e p orts 
availab le on the system, b ut it d oes p lac e some traffic  d emand s on the 
voic e p orts. 
The DOSS c onfig urator uses the following  estimates to c alc ulate voic e 
p ort req uirements for AMIS Analog  Networking  and  Messag e Delivery:
nThe total numb er of ad ministered  remote sub sc rib ers.
nThe numb er of inc oming  and  outg oing  AMIS messag es d uring  
the b usiest hour of the d ay.
nThe averag e leng th of inc oming  and  outg oing  AMIS messag es.
nThe numb er of Messag e Delivery messag es d uring  the b usiest 
hour of the d ay.
nThe averag e leng th of Messag e Delivery messag es. The DOSS 
c onfig urator assumes these messag es have two stand ard  
c harac teristic s:
— 50% of the c alls are unsuc c essful and  req uire a retry; these 
c alls are suc c essful on the retry.
— An unsuc c essful c all req uires 60 sec ond s.
Voice Storage
Rather than using  Luc ent Tec hnolog ies’ formula for d etermining  voic e 
storage req uirements, c ustomers may sp ec ify the amount of voic e 
storage they require. Customers who want to use multip le lang uage 
sets, however, should  consider voice storag e req uirements for the 
Multiling ual feature in their c alc ulations.
Voice Storage for Announcement Sets
One MO d isk c omes with the DEFINITY AUDIX system for eac h 
multiling ual announc ement set c ustomers p urc hase. The Multiling ual 
feature allows c ustomers to use up  to nine lang uag e sets at onc e.
The amount of availab le hard  d isk storag e d etermines, in p art, the 
numb er of announc ement sets the DEFINITY AUDIX system c an hold.
1  
						

							DEFINITY AUDIX System Release 4.0
System Description Pocket Reference  585-300-214  Issue 1
May 1999
Capacity and Sizing 
3-5 INTUITY Message Manager 
The DOSS c onfig urator allots two hours of voic e storag e sp ac e for eac h 
aud ib le lang uag e set or three hours of sp ac e for the 
Telec ommunic ations Devic e for the Deaf (TDD) announc ement set. 
Ta b l e  3 - 3
 shows the numb er of lang uage sets the system c an hold, 
g iven its voic e storag e c ap ac ity minus a two-hour allowanc e for eac h 
languag e set. Ad ding lang uag e sets will red uc e the DEFINITY AUDIX 
system’s response time no more than 10% per lang uag e set.
NOTE:
The numb er of lang uag e sets the c ustomer stores on the DEFINITY 
AUDIX system will signific antly affec t the number of hours left on 
the hard  d isk d rive to store voic e mail and  announc ements. 
Althoug h it is p ossib le, for example, to store five lang uage sets on 
the system’s stand ard , 10-hour voic e storag e b loc k, a system 
c onfig ured  this way would  have no sp ac e to store messag es.
INTUITY Message Manager
The DEFINITY AUDIX system sup ports up  to 500 INTUITY Messag e 
Manag er users. 32 users c an log  on to the system at onc e.
When a sub scriber uses I
NTUITY Message Manager, the app lic ation will 
not c omp ete for voic e p orts on the DEFINITY AUDIX system any more 
than a telep hone. However, the app lic ation will c ompete with telep hones 
for hard  d isk storage and  c entral p rocessor ac tivities. Ta b l e  3 - 4
 shows 
the uses of INTUITY Messag e Manag er that c ould  d emand  system 
resourc es.
1. The system will not hold  more than 9 lang uage sets.
Table 3-3. Multilingual Language Sets per System Capacity
Voice storage capacity 
(Hours)Maximum number of 
language setsSpace available for voice 
storage (Hours)
10 5 0
15 7 1
20 9
1
1. The system will not hold  more than 9 lang uag e sets.2 
						

							DEFINITY AUDIX System Release 4.0
System Description Pocket Reference  585-300-214  Issue 1
May 1999
Capacity and Sizing 
3-6 Backup Limits on the MO Disk 
Table 3-4. Limits for INTUITY Message Manager
Backup Limits on the MO Disk Drive
The 100-hour disk drive will ac c ommod ate up  to 100,000 remote 
sub sc rib ers. If more than 60,000 remote sub sc rib ers use the system, 
however, the system will only b ac k up  the loc al sub sc rib er names d uring  
the weekly names b ac kup . System ad ministrators c an b ac k up  the loc al 
and remote subsc rib er names on d emand as long as the number of 
remote sub sc rib ers d oes not exc eed  90,000. System ad ministrators 
c annot b ac k up  any remote sub sc rib ers’ voic ed  names if the numb er of 
remote sub sc rib ers exc eed s 90,000.
System activities L im it s U se r  a ct i vi t ie s
Ad ministered 
subsc ribersLimits of the 
DEFINITY 
AUDIX systemNone
TCP/IP sessions 0 to 500 Sub sc rib ers rec eive notification of new 
messag es arriving in their AUDIX 
mailboxes
Login sessions 0 to 32
nCreate messagesnAdminister p ersonal g reeting s
nAdminister notificationnAc cess d irec toriesnForward  message
nReplay to send ernCall sendernEmpty wasteb asket
nMove messages between fold ersnView server data and  ad ministrationnRefresh message head er c ontents
Aud io sessions 0 to 121
1. 0 to 8 with Digital Networking
nPlay back messagesnRecord and p lay bac k personal 
greeting s
nCreate messagesnCall send er
nPlay or record namenOrig inate c all via INTUITY Messag e 
Manager 
						

							Transition Notes 
A-1
System Design 
DEFINITY AUDIX System Release 4.0
System Description Pocket Reference  585-300-214  Issue 1
May 1999
Appendix A — Transition Notes
The hard ware d esig n for DEFINITY AUDIX system Release 4.0 has 
c hang ed  sig nific antly from p revious releases of the system. The most 
imp ortant result of these c hang es is a 60% red uc tion in the sp ac e the 
system req uires in the c ustomer’s switc h.
The c hange in system size req uired  some c hanges in func tionality that 
may imp ac t c ustomers who migrate from p revious system releases to 
Release 4.0. This ap p end ix exp lains these c hang es in d etail. For more 
information ab out the d esig n and  op eration of DEFINITY AUDIX system 
Release 4.0, see Chapter 2
. 
System Design
DEFINITY AUDIX system Release 4.0 uses one c irc uit p ac k, the TN568. 
With its ad d itional hard ware c omp onents, inc lud ing  the MO d rive and  
the hard  disk drive, the system oc c upies two universal p ort slots in the 
c ustomer’s switc h.
1 Previous releases of the DEFINITY AUDIX system 
used  two c irc uit p ac ks—either a TN566 or a TN567 multifunc tion b oard  
and  an alarm b oard . Bec ause of this d esig n, p revious releases of the 
DEFINITY AUDIX system oc c up ied  five port slots in the c ustomer’s 
switc h. 
Native and Non-native Support
When the DEFINITY AUDIX system operates in native mod e, the switc h 
reserves a numb er of p ort slots for the system b ased  on the system’s 
size. DEFINITY AUDIX system releases earlier than 4.0 were five slots 
wide, so switc h releases that sup ported the system in native mod e 
reserved five slots for the system. Bec ause DEFINITY AUDIX system 
Release 4.0 only req uires two slots in the switc h, switc h releases that 
sup port the system in native mod e will only reserve two slots for the 
system.
1
DEFINITY switc h Version 4, Version 5, and  Release 6 sup p orted  
DEFINITY AUDIX system releases earlier than 4.0 in native mode. 
However, only DEFINITY switc h releases 7.1 and later will supp ort 
DEFINITY AUDIX system Release 4.0 in native mode. 
This c hang e mainly imp ac ts c ustomers who want to migrate from 
DEFINITY AUDIX system releases earlier than 4.0 to DEFINITY AUDIX 
system Release 4.0 for use in DEFINITY switc h Version 4, Version 5, or 
Release 6. Customers who use DEFINITY AUDIX system releases earlier 
than 4.0 in these switc hes p robably use the system in native mod e. If 
these c ustomers migrate to DEFINITY AUDIX system Release 4.0, the 
new system will operate in non-native mode.
1. The Comp ac t Mod ular Cab inet (CMC) reserves one slot if the 
system is installed in slot 6. 
						

							DEFINITY AUDIX System Release 4.0
System Description Pocket Reference  585-300-214  Issue 1
May 1999
Transition Notes A-2
System Design 
While DEFINITY switc h Version 4, Version 5, and  Release 6 rec ognized  
earlier DEFINITY AUDIX system releases’ TN566 or TN567 c irc uit p ac ks 
as b elonging to the DEFINTY AUDIX system, these switc h releases will 
rec ognize DEFINITY AUDIX system Release 4.0’s TN568 c irc uit p ac k as 
a TN754 or TN2181 dig ital port c ircuit p ack.
2 Bec ause of this c hang e, 
the switc h will only reserve one p ort slot for the system, instead of five. 
The port slot the switc h reserves will house the TN568 c irc uit pac k, and  
the DEFINITY AUDIX system’s other hardware c omp onents will 
p hysic ally oc c up y a sec ond  slot.
The c hang e from native to non-native sup port for the system in earlier 
switc h releases allows c ustomers to b enefit from the ad vantag es of the 
red uc ed size of DEFINITY AUDIX system Release 4.0. For more 
information ab out these ad vantag es, see Chap ter 1.
Vo i c e  P o r t s
DEFINITY AUDIX system Release 4.0 supp orts a maximum of 12 voic e 
p orts without d ig ital networking  or 8 voic e p orts with d ig ital networking . 
Previous releases of the DEFINITY AUDIX system sup ported a maximum 
of 16 voic e p orts without dig ital networking or 12 voic e p orts with dig ital 
networking.
Administration Impacts
The DEFINITY AUDIX system will op erate in native mode in DEFINITY 
switc h releases 7.1 and later. These switc hes will know that the 
DEFINITY AUDIX system’s maximum c apac ity is 12 voic e ports, and  that 
is the maximum number of voic e p orts these switc hes will allow 
c ustomers to administer for the system.
If the DEFINITY AUDIX system operates in non-native mode, however, 
the system must emulate an 8-p ort or 16-p ort c irc uit p ac k. The system 
c annot emulate a 12-p ort c irc uit p ac k. 
When previous releases of the DEFINITY AUDIX system operated  in 
non-native mod e, system ad ministrators or tec hnic ians were req uired  to 
administer the maximum number of voice ports the switc h would  allot for 
the system—either 8 or 16. If, for examp le, a c ustomer p urc hased  4 
voic e ports, but the DEFINITY AUDIX system emulated a TN2181 
16-p ort c irc uit p ac k, the ad ministrator or tec hnic ian had  to ad minister all 
16 p orts the switc h would  allow for the TN2181, even thoug h only 4 of 
the voic e p orts were ac tive on the DEFINITY AUDIX system. 
A similar rule app lies to Release 4.0. When the DEFINITY AUDIX system 
op erates in non-native mod e, the system ad ministrator or tec hnic ian 
2. Luc ent Tec hnolog ies rec ommend s emulating  a TN2181 c irc uit 
p ac k in DEFINITY switc h versions 2 and later to fac ilitate system 
exp ansion. 
						

							DEFINITY AUDIX System Release 4.0
System Description Pocket Reference  585-300-214  Issue 1
May 1999
Transition Notes A-3
System Design 
must ad minister the maximum number of voic e p orts the DEFINITY 
AUDIX system will allow.3 If the DEFINITY AUDIX system emulates a 
TN754 8-p ort c irc uit p ac k, the administrator or tec hnic ian will need  to 
administer 8 voic e p orts. On the other hand, if the DEFINITY AUDIX 
system emulates a TN2181 16-p ort c irc uit p ac k, the ad ministrator 
should only administer 12 voice ports because that is the maximum 
number of voic e p orts the DEFINITY AUDIX system sup ports.
For more information ab out voic e p ort ad ministration, see 
Installation 
and  Switc h Ad ministration for the DEFINITY AUDIX System Release 4.0, 
585-300-122.
Migration Impacts
DEFINITY AUDIX system Release 4.0 may not be the b est voic e 
messag ing  solution for c ustomers who use more than 12 voic e p orts on 
p revious releases of the system. If these c ustomers mig rate to DEFINITY 
AUDIX system Release 4.0, they may experienc e a sig nific ant dec line in 
the sp eed  of their voic e messag ing  servic e. These c ustomers may 
c onsider migrating  to an I
NTUITY messag ing  system. For more 
information about the INTUITY messag ing  system, see INTUITY Messag ing  
Solu tion s.
Digital Networking Port
DEFINITY AUDIX system Release 4.0 has one dig ital networking p ort, 
while p revious releases of the system had  two dig ital networking ports. 
Although this c hang e has only minimal affec ts on hig h-speed  Digital 
Networking  traffic —DCP Mod e 1 or DCP Mod e 3 c onnec tions—this 
c hang e sig nific antly red uc es the Digital Networking traffic  the system 
c an sup port with low-sp eed Dig ital Networking —DCP Mod e 2 
c onnec tions.
For DCP Mod e 2 c onnec tions, the following  traffic  limits ap p ly:
nThe system can network with only 10 remote AUDIX nod es.
nThe system c an ac c ommod ate no more than 100 loc al 
sub sc ribers.
nThe system c an ac c ommod ate no more than 10,000 remote 
sub sc ribers.
Customers whose DCP Mod e 2 Dig ital Networking  traffic  req uirements 
exc eed  those for DEFINITY AUDIX system Release 4.0 should c onsider 
the I
NTUITY messag ing system. For more information ab out DEFINITY 
AUDIX system Release 4.0 traffic  g uid elines, see Chap ter 3. For more 
3. This rule differs from p revious system administration c onventions 
where ad ministrators were req uired  to ad minister the maximum 
number of voic e p orts the
 switc h would  allow. 
						

							DEFINITY AUDIX System Release 4.0
System Description Pocket Reference  585-300-214  Issue 1
May 1999
Transition Notes A-4
System Design 
information about the INTUITY messag ing  system, see INTUITY Messag ing  
Solu tion s.
Alarm Origination
In ad d ition to the TN566 or TN567 multifunc tion c irc uit p ac k, p revious 
releases of the DEFINITY AUDIX system used  a sec ond ary c irc uit p ac k, 
c alled  an alarm b oard
. The alarm b oard  d iag nosed  the DEFINITY AUDIX 
system for trouble and  p osted  ac tive alarms for the system administrator 
and  Luc ent Tec hnolog ies’ Initialization and  Ad ministration System 
(INADS). The TN568 c ircuit p ack performs these functions on Release 
4.0.
External Modem
In add ition to the alarm b oard , p revious DEFINITY AUDIX system 
releases used an internal mod em to notify INADS of ac tive alarms and  
p rovid e the Remote Servic es Center (RSC) remote ac c ess to the system 
for maintenanc e and alarm resolution. DEFINITY AUDIX system Release 
4.0 uses an external mod em to p erform these tasks.
The c hang e to an external mod em help s red uc e the sp ac e the system 
oc c up ies in the switc h. It also imp roves the system’s flexibility for 
meeting  international c ommunic ation standard s.
Administration Impacts
Because DEFINITY AUDIX system Release 4.0 uses an external modem, 
rather than an internal modem, c ustomers c an use a numb er of modems 
with their DEFINTIY AUDIX systems.
4 If c ustomers use a mod em other 
than the U.S. Rob otic s 33.6 Kb p s Sp ortster mod em—the d efault mod em 
for U.S. c ustomers—the installer or system administrator must enter an 
initialization string for the modem in the 
System-Parameters-Maintenanc e sc reen during initial DEFINITY AUDIX 
system ad ministration. 
NOTE:
Luc ent Tec hnolog ies d oes not p rovid e maintenanc e sup p ort for 
external mod ems other than the U.S. Rob otic s 33.6 Kb p s Sp ortster 
mod em for the DEFINITY AUDIX system Release 4.0.
The system’s d efault initialization string c orrespond s to the U.S. 
Robotic s 33.6 Kbp s Sportster modem. System ad ministrators should 
look for other mod em initialization string s in the doc umentation for their 
mod ems and  enter these initialization string s manually. For more 
4. Luc ent Technologies recommend s using  the U.S. Rob otic s 33.6 
Kb p s Sp ortster mod em in the U.S. and  other c ountries where this 
mod em meets c ommunic ation stand ard s.