Lucent Technologies DEFINITY® Enterprise Communication Server Release 8.2 Reports Guide

							DEFINITY Enterprise Communication Server Release 8.2
Reports Guide  555-233-505  Issue 1
April 2000
Traffic Data Analysis 
3-179 Trunk Group Status Report 
3
Determining the Number of Trunks 
Required for a Specified Grade of Service
For b oth stand-alone and  last-c hoic e trunk group s, use the trunk g roup peak 
traffic  rep orts to d etermine the numb er of trunks req uired  to p rovid e a sp ec ified  
Grad e of Servic e. The numb er of trunks req uired  stric tly dep end s on the Grad e of 
Servic e you want to p rovid e.
NOTE:
Stand -alone and  last-c hoic e trunk g roup s d o not reroute their b loc ked  c alls. 
As a c ontrast, Alternate Routing  trunks d o reroute their b loc ked  c alls.
The p roc ed ure for d etermining  the op timal numb er of trunk memb ers for a 
p artic ular trunk g roup  req uires you initially g enerate the ap p rop riate rep orts and  
sub sequently rec ord  the d ata on the Trunk Group  Data Worksheets. What you 
attemp t to ac c omplish is to id entify the p eak hour and  the traffic  d ata for that 
hour. The list measurements trunk-group summary yesterday-peak 
scheduled
 c ommand  results in g enerating  all of the nec essary data on a d aily 
b asis. You c an enter 20 weekd ays of d ata on eac h Trunk Group  Data Worksheet. 
Sub seq uently, you need  only sc an the worksheet to id entify whic h measurement 
hour oc c urs most freq uently. The most freq uent measurement hour is c onsid ered  
the p eak hour. You should  use the d ata for the id entified  p eak hour, that has the 
highest total usag e, to c alc ulate the req uired  numb er of trunks.
Example 1:
Assumptions
1. You ob tain d ata (d aily) and  rec ord  that d ata on ap p rop riately id entified  
Trunk Group  Data Worksheets.
2. 1300 is the p eak hour (or b ounc ing  p eak hour).
3. Trunk Group  1 is susp ec ted  of not provid ing  the desired  Grad e of Servic e.
For two-way trunk group s the equation for d etermining  Calls Carried  is as follows:
For Trunk Group s Without a Queue 
For Trunk Group s With a Queue 
Calls Carried=Total Seize
Calls Carried=280
Total Calls O ff ered=Calls Carried+Group Over f low
Total Calls O ff ered=
Calls Carried+Queue Over f low+Queue Abandoned 
						

							DEFINITY Enterprise Communication Server Release 8.2
Reports Guide  555-233-505  Issue 1
April 2000
Traffic Data Analysis 
3-180 Trunk Group Status Report 
3
Sinc e Trunk Group  1 has a q ueue, the eq uation for Calls Offered  is as follows: 
The Averag e Hold ing  Time is d etermined  as follows: 
Offered  Load  is defined  as the numb er of c alls in p rogress if there had  b een no 
b loc king  or d elay. The Offered  Load  is c alc ulated  as follows: 
The c alc ulated  Offered  Load  is used  with the Retrial Cap ac ity tab les, to 
d etermine the numb er of trunks req uired  to p rovid e a sp ec ified  Grade of Servic e. 
For more information, refer to 
Basic  Traffic  Analysis.
The d esired  Grad e of Servic e is d ep end ent on the p artic ular trunk typ e (for 
examp le, CO, d id , tie, FX, WATS, and  so on) and  the nature of the business the 
trunk typ e sup p orts. Generally, those trunk typ es that are least exp ensive (for 
examp le, CO) are eng ineered  for a 1 p erc ent (P.01) Grad e of Servic e. Those 
trunk typ es that are more exp ensive are eng ineered to p rovid e from 2 p erc ent to 
5 p erc ent (P.02 to P.05) Grad e of Servic e.
NOTE:
A one p erc ent Grad e of Servic e means the frac tion of c alls b loc ked  d uring  
the identified  b ounc ing  p eak hour should  not exc eed  1 p erc ent.
Assuming  we d esire a P.01 Grade of Servic e on Trunk Group  1, for the c alc ulated  
Offered  Load  of 775.5 CCS, the Retrial Cap ac ity tab les in 
Basic  Traffic Analysis 
indic ate (under the c olumn head ing  GROUP SIZE) 32 trunks are req uired .
Total Calls O ff ered=Calls Carried+Queue Over f low
Total Calls O ff ered=280+50+1
Total Calls O ff ered=331
Average Holding Time(in seconds)=ì
ï
îTotal Seizures Total Usage(in CCS)
_
  ___________________ü
ï
þ´
CCS 100seconds
_
  __________
Average Holding Time(in seconds)=ì
ï
î280seizures 656CCS
_
  __________ü
ï
þ´
CCS 100seconds
_
  __________
Average Holding Time(in seconds)=234. 29seconds
O ff ered  Load=Average Holding Time(in seconds)´Calls O ff ered
O ff ered  Load(in CCS)=
100seconds per CCS 234. 29  (in seconds)´331calls
_
  _____________________________
O ff ered  Load(in CCS)=775. 5 
						

							DEFINITY Enterprise Communication Server Release 8.2
Reports Guide  555-233-505  Issue 1
April 2000
Traffic Data Analysis 
3-181 Trunk Group Status Report 
3
The numb er of c urrently func tioning  (or in servic e) trunks is c alc ulated  as follows:
Therefore, sinc e 32 trunks are req uired  b ut only 23 are c urrently in servic e, nine 
additional trunks must be added to obtain the desired Grade of Service.
Example 2:
Assumptions
1. You ob tain d ata (d aily) and  rec ord  that d ata on ap p rop riately id entified  
Trunk Group  Data Worksheets.
2. 1300 is the p eak hour (or b ounc ing  p eak hour).
3. Data on trunk g roup  4 ind ic ates a higher than d esired  p erc entag e of 
outgoing blockage.
For one-way outg oing  trunk g roup s, the eq uation for determining  Calls Carried is 
as follows:
Sinc e Trunk Group  4 d oes not have a q ueue, the eq uation for Calls Offered  is as 
follows: 
The Averag e Hold ing  Time is d etermined  as follows: 
# o f  In-Service Trunks=Trunk Group Size-Out o f  Service Trunks
# o f  In-Service Trunks=23-0
# o f  In-Service Trunks=23
Calls Carried=Total Seize
Calls Carried=81
Calls O ff ered=Calls Carried+Group Over f low
Calls O ff ered=81+5
Calls O ff ered=86
Average Holding Time(in seconds)=ì
ï
îTotal Calls Total Usage(in CCS)
_
  ___________________ü
ï
þ´
CCS 100seconds
_
  __________
Average Holding Time(in seconds)=ì
ï
î81calls 73CCS
_
  _______ü
ï
þ´
CCS 100seconds
_
  ___________
Average Holding Time(in seconds)=90. 12seconds 
						

							DEFINITY Enterprise Communication Server Release 8.2
Reports Guide  555-233-505  Issue 1
April 2000
Traffic Data Analysis 
3-182 Trunk Group Status Report 
3
Offered  Load is defined  as the numb er of c alls in p rog ress if there is no b loc king  
or d elay. The Offered  Load  c an b e c alc ulated  as follows: 
The c alc ulated  Offered  Load  is used , with the Retrial Cap ac ity tab les, to 
d etermine the number of trunks req uired  to p rovid e a sp ec ified  Grad e of Servic e.
Assuming  we d esire a P.03 Grad e of Servic e on Trunk Group  4, then for the 
c alc ulated  Offered  Load  of 78 CCS the Retrial Capac ity tab les in
 Basic  Traffic 
Analysis
 ind ic ate (und er the c olumn head ing  GROUP SIZE) six trunks are 
req uired. The numb er of c urrently func tioning  (or in-servic e) trunks is as follows: 
Therefore, sinc e six trunks are req uired  b ut only four are c urrently in-servic e, two 
ad d itional trunks are need ed  to ob tain the d esired  Grad e of Servic e. The ob vious 
op tions are have the out-of-servic e trunk rep aired  and  just ad d  one new trunk, or 
ad d  two new trunks.
Example 3:
Assumptions
1. You ob tain d ata (d aily) and  rec ord  that d ata on ap p rop riately id entified  
Trunk Group  Data worksheets.
2. 1300 is the p eak hour (or b ounc ing  p eak hour).
3. That Trunk Group  2 ind ic ates a hig her % ATB than d esired .
Inc oming  trunk g roup s d o not have q ueues. Therefore, from the switc h 
p ersp ec tive you c annot d etermine the numb er of c alls b loc ked . But, in this c ase 
Total Usag e is ac tually the Carried  CCS. You c an use the Carried  CCS, with the 
Retrial Cap ac ity tab les, to d etermine the number of trunks req uired  to p rovid e a 
sp ec ified  Grad e of Servic e.
O ff ered  Load=Average Holding Time(in seconds)´Calls O ff ered
O ff ered  Load(in CCS)=90. 12  (in seconds)´86calls
O ff ered  Load(in CCS)=77. 50CCS or78CCS
# o f  In-Service Trunks=Trunk Group Size-Out o f  Service Trunks
# o f  In-Service Trunks=5-1
# o f  In-Service Trunks=4 
						

							DEFINITY Enterprise Communication Server Release 8.2
Reports Guide  555-233-505  Issue 1
April 2000
Traffic Data Analysis 
3-183 Trunk Group Call-By-Call (CBC) 
3
Assuming  you desire a P.05 Grad e of Servic e on trunk g roup  #2, then for a 
Carried  CCS of 201 CCS the Retrial Cap ac ity tab les in the 
DEFINITY 
Communic ations System and System 75 and  System 85 Traffic  Tab les
, 
555-104-503, ind ic ates (und er the c olumn head ing  GROUP SIZE) 10 trunks are 
req uired. The numb er of c urrently func tioning  (or in-servic e) trunks is as follows: 
Therefore, sinc e 10 trunks are req uired  b ut only 6 are c urrently in-servic e, four 
ad d itional trunks are need ed  to ob tain the desired  Grad e-of-Servic e. The solution 
is to ad d  four trunk memb ers to the trunk group .
Trunk Group Call-By-Call (CBC)
Background Information
1. In a non-Call-By-Call Servic e Selec tion environment, a trunk g roup  must 
b e p reassig ned  and  p rovisioned for eac h d esired  servic e (for example, 
MEGACOM telec ommunic ations servic e, WATS, SDN, and so on). With 
this arrang ement, eac h trunk g roup  must b e d esig ned  to ac c ommod ate 
the p eak traffic  load  for the intended  servic e ap p lic ation. Furthermore, the 
time when one servic e ap p lic ation enc ounters p eak traffic  may not 
coinc ide with when another servic e application encounters peak traffic. As 
an alternative, if multip le network servic es are ac c ommod ated  with a 
sing le trunk g roup  (referred  to as a CBC Trunk Group ), and  that trunk 
g roup is p rovid ed  with alloc ation and  sc hed uling  c ontrols, signific ant 
trunking  effic ienc ies may b e realized  b y d istributing  the total traffic  for all 
of the sp ec ified  network servic es over the total numb er of availab le trunk 
memb ers.
2. By implementing Usage Allocation Plans (UAPs) you can optimize, within 
c ertain limits, the CBC trunk g roup  without involving  any of the 
Inter-Exc hang e Carrier/Loc al Exc hange Carrier (IXC/LEC) network 
servic es p ersonnel. Eac h Usag e Alloc ation Plan sp ec ifies the network 
servic es/features that may b e ac c ommod ated  with the trunk g roup . It also 
sp ec ifies the minimum numb er of reserved  c hannels and  maximum 
numb er of c hannels eac h servic e/feature may use at a given time.
# o f  In-Service Trunks=Trunk Group Size-Out o f  Service Trunks
# o f  In-Service Trunks=6-0
# o f  In-Service Trunks=6 
						

							DEFINITY Enterprise Communication Server Release 8.2
Reports Guide  555-233-505  Issue 1
April 2000
Traffic Data Analysis 
3-184 Trunk Group Call-By-Call (CBC) 
3
3. The free pool concept is associated with UAP’s. Sp ec ific ally, free p ool 
refers to the numb er of trunks not reserved  for a sp ec ific  servic e/feature 
and  free to b e assig ned  to another servic e or feature. The free pool is 
calculated as: 
4. Eac h UAP may b e ad ministered  as fixed  or sc hed uled . If fixed , a sp ec ified  
p lan remains in effec t c ontinuously. If sc hed uled , two or three UAPs may 
be scheduled to vary both by day of week and time of day.
5. Before you analyze the Trunk Group  CBC Measurements Report, you must 
know the intent of the strateg y for eac h UAP. You should  have (in hand ) a 
completed copy of the CBC Trunk Group UAP and the associated 
Assig nment Sc hed ule, whic h are Pag es 3 and  4 of the Trunk Group  
Ad ministration sc reen. For ad d itional d etails, refer to your 
DEFINITY ECS 
Ad ministrator’s Guid e
, or to the DEFINITY ECS Communic ations System 
Generic  1 DS1/DMI/ISDN-PRI Referenc e
.
6. For wid eb and  c alls that c onsume more than 64 kb p s of b and wid th, the 
total usag e c onsumed is reflec ted  in the Total Usag e field . (For example, 
the usag e for a 384-kb p s c all is six times more than for a 64-kb ps c all.) 
However, these c alls are c ounted  only as a sing le c all. The c all c ounts that 
may b e inc remented  d ue to wid eb and  c alls are: Total Seize, Inc oming  
Seize, Overflow Trunk Group , Overflow Servic e/Feature, and Overflow 
Maximum Servic e/Feature. The %ATB and %Out Blk field s are also 
affec ted  b y wid eband  c alls.
Free Pool=Total # o f  in-service Trunks-So f  the  Mins *(f or each S / F)
* Minimum channel assignment. 
						

							DEFINITY Enterprise Communication Server Release 8.2
Reports Guide  555-233-505  Issue 1
April 2000
Traffic Data Analysis 
3-185 Trunk Group Call-By-Call Measurements Report 
3
Trunk Group Call-By-Call
Measurements Report
The Trunk Group  Call-By-Call (CBC) Measurements rep ort d isp lays last-hour 
traffic  d ata for any sp ec ified  c b c  trunk g roup , p rovid ed  the trunk g roup  had  a 
Usag e Alloc ation Plan (UAP) ad ministered  for the last-hour. Use the rep ort to 
monitor the trunk g roup and  to d etermine if the UAP meets c urrent need s. 
Whenever it is determined  c hang es are req uired, you must make these c hang es 
on the ap p rop riate trunk g roup  sc reen(s). Note that if the trunk g roup  is 
administered to support wideband switching, the tag “WIDEBAND Support” 
ap p ears in the rep ort title.
Command
To d isp lay the Trunk Group  CBC Measurements Report:
1. Type list measurements cbc-trunk-group  last-hour [print/schedule] 
and press 
RETU RN.
Required Fields: There is only one required field for this command—ISDN 
CBC trunk group number
. Enter the ISDN CBC trunk g roup numb er for 
whic h you want to list the last-hour traffic  data. 
Options: The print
 and  schedule
 op tions are availab le for this c ommand .
Screen
Screen 3-62 shows a typ ic al sc reen for the Trunk Group  Call-By-Call 
Measurements report. The line just above the report title displays the date and 
time for whic h the rep ort was req uested . Table 3-52
 describes the data fields 
p resented  in the CBC Trunk Group  Measurements rep ort.
Screen 3-62. Trunk Group Call-By-Call Measurements Report
list measurements cbc-trunk-group 99 last-hour 
Switch Name:  Cust_Switch_Name             Date: 2:15 pm WED MAY 9, 19xx 
   CBC TRUNK GROUP MEASUREMENTS (WIDEBAND Support) 
    Peak Hour For CBC Trunk Group 99 : 1300 
   Queue Size:40                             Usage Allocation Plan Used 
  Calls Queued:23                   Plan Number:  1  0   0   0   0   0 
  Queue Overflow: 0                      Duration: 60  0   0   0   0   0 
 Queue Abandonments: 4 
 Out of Service: 0 
 Service/     Min Max Meas Total Total Inc.  Tan  Ovf Ovf Ovf %    %  %Out 
 Feature      Chn Chn Hour Usage Seize Seize Seize TG S/F Max TBM ATB BLK 
 outwats-bnd    5  12 1300   240   333   0    55    0  0  23   10   2   1 
 sdn            4   8 1300    40    30  22     1    0  0   0   62   1   0 
 other          0  20 1300    70    41  36     3    0  0   0    0   0   0 
Command successfully completed 
Command: 
						

							DEFINITY Enterprise Communication Server Release 8.2
Reports Guide  555-233-505  Issue 1
April 2000
Traffic Data Analysis 
3-186 Trunk Group Call-By-Call Measurements Report 
3
Table 3-52. Trunk Group Call-By-Call Measurements Report 
Field Description
Queue Size
Size of the q ueue for the ISDN-PRI CBC trunk g roup . If zero is 
d isp layed , then no q ueue is ad ministered . Henc e, the other 
q ueue measurements is also zero. If the q ueue is 
ad ministered , then it serves all of the network 
services/features administered for the trunk group. However, 
its func tional op eration is somewhat d ifferent than the q ueue 
used  with c onventional trunk g roup s. When a p artic ular 
servic e/feature uses its allotted  maximum numb er of 
c hannels, then any ad d itional c all attemp ts are q ueued , even 
thoug h not all of the trunks are c urrently in use. If the q ueue is 
alread y full, any ad d itional c all attemp ts simp ly overflow with 
the c aller rec eiving  reorder tone.
Recommendations:
 Sinc e one servic e/feature g enerally 
d oes not exp erienc e p eak traffic  the same time as another 
servic e/feature, there is an averag ing effec t. Furthermore, the 
q ueue size for a CBC trunk g roup  need  not b e muc h larg er 
than for a non-CBC trunk g roup . The Queue Size should  b e 
larg er than the trunk g roup  size; b ut, typ ic ally, not more than 
three times as larg e as the trunk group  size.
Calls Queued
The total numb er of c alls entered  the CBC trunk g roup q ueue 
d uring  the hour.
Queue 
OverflowThe total number of c alls d enied  ac c ess to a trunk, found  the 
queue full, and the caller received reorder tone.
Suggested Actions:
 Generally, this field  ind ic ates the 
numb er 0. If this field ind ic ates a hig h numb er, then the 
q ueue size may b e too small, more trunks may b e need ed so 
fewer c alls will q ueue, or the UAP may b e too restric tive (for 
examp le, some of the “ Min Chn”  values may be too hig h, or 
some of the “ Max Chn”  values may b e too low). Also, see 
Suggested Actions in the % TBM description.
Continued on next page 
						

							DEFINITY Enterprise Communication Server Release 8.2
Reports Guide  555-233-505  Issue 1
April 2000
Traffic Data Analysis 
3-187 Trunk Group Call-By-Call Measurements Report 
3
Queue 
AbandonmentsThe numb er of c alls removed  from the q ueue b y either the 
system or the user. The system automatic ally removes c alls 
from the q ueue after 30 minutes. A user may ab and on his/her 
c all b y c anc eling  the Automatic  Callb ac k feature (set earlier 
to p lac e their c all in the q ueue).
Suggested Action:
 Rec all that a trunk group  and  its 
assoc iated  q ueues are sized  to ac c ommod ate p eak-hour 
traffic  load s. Typic ally, this field  ind ic ates a small numb er. 
However, a larg e numb er g enerally ind ic ates the q ueue size 
is too larg e and  p eop le are ab andoning  b ec ause they 
remained  in q ueue for a long  time. Consid er ad d ing  more 
trunks so fewer c alls q ueue.
Out of 
ServiceThe numb er of trunks in the trunk g roup  out of servic e at the 
time the measurements are c ollec ted . An ind ivid ual trunk 
may b e taken out of servic e either automatic ally b y the switc h 
whenever an exc essive number of errors oc c ur, or b y 
maintenanc e p ersonnel in ord er to run d iag nostic  tests.
Suggested Action:
 If the trunks were removed  from servic e 
b y the switc h, then the app rop riate maintenanc e p ersonnel 
should  b e notified . The ob jec tive is to keep  all memb ers of a 
trunk g roup  in servic e. Generally, you should  not make 
ad justments to the CBC trunk g roup  b ec ause of Out of 
Servic e trunks, b ut should  g et those trunks returned  to 
service.
Usage 
Allocation 
Plan UsedA list of the Usag e Alloc ation Plan numb ers followed  b y a list 
of the d urations (in minutes) eac h plan was in effec t d uring  
the measurement interval. The Numb er field c an d isp lay up  to 
a maximum of six p lan numb ers. A maximum of three 
d ifferent UAPs (id entified  b y the numb ers 1, 2, and  3) may b e 
d efined for eac h trunk g roup . All three p lans are d efined on 
Pag e 3 of the trunk g roup  sc reen. Pag e 4 of the 
c orresp ond ing  trunk g roup  sc reen is where you ad minister 
plan assignments.
Usage 
Allocation 
Plan Used 
(Contd)Ea c h  C B C trunk g roup  is ad ministered  with either “ fixed ”  
alloc ation or “ sc hed uled ”  alloc ation. If fixed , it remains in 
effec t c ontinuously. If sc hed uled , the d esig nated  p lans are 
activated on a per-day and time-of-day basis determined by 
the sc hed ule.
Table 3-52. Trunk Group Call-By-Call Measurements Report  — Continued
Field Description
Continued on next page 
						

							DEFINITY Enterprise Communication Server Release 8.2
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April 2000
Traffic Data Analysis 
3-188 Trunk Group Call-By-Call Measurements Report 
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Service 
FeatureThe names of up  to ten servic es/features and  the sp ec ial 
id entifier “ other”  for whic h the assoc iated  measurements are 
rep orted. 
Min Chn
Minimum Numb er of Channels. The minimum numb er of 
c hannels in the ISDN-PRI CBC trunk g roup alloc ated  to the 
sp ec ified  servic e/feature at the time the measurements are 
collected.
Max Chn
Maximum Numb er of Channels. The maximum numb er of 
c hannels in the ISDN-PRI CBC trunk g roup alloc ated  to the 
sp ec ified  servic e or feature at the time the measurements are 
collected.
Total Usage
The sum of time, in hund red -c all-sec ond s (CCS), for all 
c hannels used by the sp ec ified  servic e/feature d uring  the 
measurement interval.
Total Seize
Total Seizures. The total numb er of inc oming  and  outg oing  
c alls that req uested  the sp ec ified  servic e/feature throug h the 
ISDN-PRI CBC trunk g roup .
Inc. Seize
Inc oming  Seizures. The total numb er of inc oming  c alls that 
req uested  the sp ec ified  servic e/feature throug h the ISDN-PRI 
CBC trunk g roup . For two-way and outg oing  trunks, the 
numb er of 
Outg oing  Seizures c an b e c alc ulated  as follows: 
Tan Seize
Tand em Seizures. The total numb er of trunk-to-trunk c all 
seizures using this Service/Feature.
Table 3-52. Trunk Group Call-By-Call Measurements Report  — Continued
Field Description
Continued on next page
Out Seize
=Total Seize
-In Seize