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D Capacities and Performance Erlang. The Erlang is a unit of measure of the intensity of telephone traffic. It measures the average utilization of a set of system resources during a given time period. For example, if a server (trunk) is busy for 30 seconds over a measurement period of 2 minutes, the traffic intensity for that measurement period is 0.25 (30sec/120sec) Erlangs. An intensity of one Erlang represents the full utilization of one call server, or an average of 1/nth utilization of n servers, over the measurement time period. Since the Erlang is time divided by time, it is a dimensionless unit. The maximum capacity of one trunk is one Erlang and the maximum capacity of a group of trunks is equal to the number of trunks in Erlangs. For example, the maximum capacity of a group of 30 trunks is 30 Erlangs. If, during a given hour the utilization of the trunk group was 10 Erlangs, on average 10 trunks were busy. This could have happened for 10 one-hour calls (unlikely) or 600 one-minute calls, or any combination of calls and durations that result in 36,000 call-seconds. Another measure of traffic intensity is the CCS, or hundred (century) call-seconds per hour. Since one Erlang is equal to 3600 call-seconds per hour, one Erlang is equal to 36 CCS per hour. Erlang B. The probability distribution used to estimate the number of trunks needed to carry a given amount of traffic for a “loss system.” It assumes that when a call arriving at random finds all trunks busy, it vanishes and doesn’t return (“lost calls cleared”). Erlang C. The probability distribution used to estimate the number of trunks needed to carry a given amount of traffic for a “delay system.” It assumes that all calls will wait indefinitely to get through. Processor performance The number of thousands busy-hour calls (KBHC) can be estimated as a function of the processor occupancy estimate (POE) and the time per call (T), in milliseconds, as follows: KBHC ≤ 36*POE / T The following table gives the estimated BHC capacity for the G3r and G3si models given various values of POE and T. T(ms) G3r POE = 57% POE = 65% T(ms) G3si POE = 52% POE = 60% 100 20,500 23,400 200 9,400 10,800 150 13,700 15,600 300 6,200 7,200 200 10,300 11,700 400 4,700 5,400 TDM bus performance The impact of H.323 voice-only calls on the TDM bus is the same as for circuit switch voice calls. 410 Administration for Network Connectivity CID: 77730 555-233-504 — Issue 1 — April 2000
D Capacities and Performance Number of MedPros needed The following table gives the approximate carried load (CL m ), in Erlangs, for m MedPro boards installed. Carried loads are shown for a = 22 and 31 audio streams per MedPro board, corresponding to having the G.723 or G.729A (a=22) or the G.711 (a=31) codecs administered. Number of MedPro boards CL m for GOS = P001 CL m for Full Availability a = 22 a=31 a = 22 a=31 1 10.5 17.0 22 31 2 26.9 41.4 44 62 3 44.7 65.7 66 93 4 63.2 94.3 88 124 5 82.1 121.7 110 155 6 101.4 149.5 132 186 7 120.9 177.6 154 217 8 140.5 205.9 176 248 9 160.4 234.3 198 279 10 180.3 262.9 220 310 15 281.4 407.6 330 465 20 384.1 554.0 440 620 25 487.7 701.5 550 775 30 591.9 849.7 660 930 35 696.7 998.6 770 1085 40 801.8 1147.9 880 1240 46 923.4 1327.6 1012 1426 Assumptions This table assumes: • In columns 2 and 3, the carried loads are calculated assuming an infinite source for Grade of Service (GOS) of P001. The carried loads are calculated as an average of Erlang B and Erlang C to account for retrials • In columns 3 and 4, the carried loads are calculated assuming full availability (no blocking). Note that the carried load for the full availability case is just the number of audio streams times the number of MedPro boards. Administration for Network Connectivity 555-233-504 — Issue 1 — April 2000 CID: 77730 411
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DEFINITY ® Enterprise Communicatio
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Contents Preface Purpose. . . . . .
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Contents Switch-Node 3 Administrati
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Contents QSIG . . . . . . . . . . .
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Preface This book describes how to
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Issue Status Preface ppp Data Modul
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Issue Status Preface Reorganization
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Terminology Preface Terminology The
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Tell us what you think Preface Tell
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Trademarks Preface Trademarks The f
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1 Networking Overview This chapter
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DEFINITY Switch Connectivity 1 Netw
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IP Softphones 1 Networking Overview
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IP Addressing 1 Networking Overview
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2 H.323 Trunks This chapter describ
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H.323 Trunk Administration 2 H.323
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Troubleshooting IP Solutions 2 H.32
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3 C-LAN Administration This chapter
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Overview 3 C-LAN Administration ✔
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Overview 3 C-LAN Administration TCP
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Overview 3 C-LAN Administration Int
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Configuration 1: R8r R8si 3 C-LAN
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Configuration 2: R7r (+CMS) R7csi
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Configuration 3: R8si R8r Gateway
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Configuration 5A: R8csi R8r (one C
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4 Networking Example This chapter p
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Overview 4 Networking Example Task
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Network Map 4 Networking Example Ne
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Intuity Translations for DCS AUDIX
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A Screens Reference This appendix g
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Networking Screens A Screens Refere
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Other Networking-Related DEFINITY S
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B Private Networking This appendix
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Distributed Communications System B
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ISDN Feature Plus B Private Network
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ISDN Feature Plus B Private Network
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G References Installation and maint
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G References CentreVu CMS The follo
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Glossary A AAR See Automatic Altern
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B8ZS Glossary B B8ZS See Bipolar 8
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Call Management System (CMS) Glossa
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COR Glossary COR See Class of Restr
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DID Glossary DID Direct Inward Dial
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facility Glossary F facility A tele
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interserver routing table Glossary
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link-access procedure on the D-chan
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NEMA Glossary NEMA National Electri
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PBX Glossary PBX Private Branch Exc
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outing plan Glossary routing plan R
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T-carrier Glossary T-carrier A hier
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virtual circuit (virtual connection
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Index A AAR and ARS features intera
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D Index Centralized Attendant Servi
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E Index E Distributed Communication
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L Index L ISDN Feature Plus feature
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R Index QSIG Call Transfer feature
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U Index U trunk access codes (TAC)
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We’d like your opinion. Lucent Te
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