Scenario without Internet telephony
Tier 1 POPs # of POPs: 450 Tier 2 POPs # of POPs: 9 Total for all POPs
Cost Summary unit Quantity Quantity Quantity Quantity Quantity
Capital Equipment cost/month per POP all POPs Cost (%cost) per POP all POPs Cost (%cost) all POPs Cost (%cost)
analog modems $23 213 95850 $2,187,792 95% 794 7146 $163,109 16% 102996 $2,350,900 70%
ISDN access router $5 8 3600 $18,374 1% 14 126 $643 0% 3726 $19,017 1%
POP server $652 0.1 49 $31,841 1% 1 11 $7,039 1% 60 $38,880 1%
content hosting server $261 0 0 $0 0% 0 0 $0 0% 0 $0 0%
LAN - 10 Mbps ethernet $3 7 3150 $8,217 0% 0 0 $0 0% 3150 $8,217 0%
LAN - 100 Mbps ethernet $13 0 0 $0 0% 18.9 170 $2,217 0% 170 $2,217 0%
56 kb CSU/DSU $13 0 0 $0 0% 160 1438 $18,754 2% 1438 $18,754 1%
T1 CSU/DSU $37 1.1 476 $17,389 1% 692 6228 $227,435 22% 6704 $244,824 7%
Cisco 2500 router $73 1 450 $32,868 1% 0 0 $0 0% 450 $32,868 1%
Cisco 7513 serial port card $417 0 0 $0 0% 106.5 958 $399,923 38% 958 $399,923 12%
Cisco 7513 ATM card $470 0 0 $0 0% 11.8 106 $49,990 5% 106 $49,990 1%
Cisco 7513 router chassis $1,565 0 0 $0 0% 11.8 106 $166,635 16% 106 $166,635 5%
Fore 4 port DS3 card $365 0 0 $0 0% 0 0.0 $0 0% 0 $0 0%
Fore 4 port OC-3 card $365 0 0 $0 0% 0 34.1 $12,463 1% 34 $12,463 0%
Fore ASX-200BX ATM switch $417 0 0 $0 0% 0 8.5 $3,561 0% 9 $3,561 0%
Total capital costs per tier $2,296,481 100% $1,051,769 100% $3,348,250 100%
Capital Equipment Quantities Tier 1 POP
analog modems:
peak combined calls per hour 385 taken from ’Tier 1 and Tier 2 call rate calculations’ chart on Transport page
avg holding time (min.) 30
Total number of modems per POP 213 = to the peak # of concurrent users
resulting sub/modem ratio 9.1 (just for reference - result is not used anywhere) ISDN access router:
peak calls per hour 1 taken from ’Tier 1 and Tier 2 call rate calculations’ chart on Transport page
avg holding time (min.) 30
Peak # of concurrent ISDN users 4 = to the peak # of concurrent users Total number of B channels required 8 # of concurrent users * 2 B channels per user POP server
# for analog dial-in users 0.11
# for ISDN dial-in users 0.00
Total POP servers 0.11
LAN sizing - # of 10 Mbps ethernet ports 7 allocate 1 switch port per 48 modems + router and server cxns
T1 CSU/DSU 1.1
Cisco 2500 router 1 1 for every 2 T1s
Tier 2 POPs analog modems:
peak combined calls per hour 1539 taken from ’Tier 1 and Tier 2 call rate calculations’ chart on Transport page
avg holding time (min.) 30
Total number of modems per POP 794 = to the peak # of concurrent users
resulting sub/modem ratio 9.7 (just for reference - result is not used anywhere) ISDN access router:
peak calls per hour 6 taken from ’Tier 1 and Tier 2 call rate calculations’ chart on Transport page
avg holding time (min.) 30
Peak # of concurrent ISDN users 7 = to the peak # of concurrent users Total number of B channels required 14 # of concurrent users * 2 B channels per user POP server:
# for analog dial-in users 0.40
# for ISDN dial-in users 0.00
# for 56K users 0.16
# for T1 users 0.64
Total POP servers 1.20
content hosting server 0
LAN sizing - # of 100 Mbps ethernet ports allocate 1 switch port per 48 modems + router and server cxns
# for analog modems 16.5
# for ISDN 0.1
# for router 1.0
# for POP servers 1.2
# for content hosting servers 0.0
Total 100 Mbps ethernet ports 18.9
56 kb CSU/DSU 160 1 for each 56 kb sub. connecting here (from tier 1 and tier 2 areas)* # of leased lines/sub
T1 CSU/DSU 1 for each T1 sub. * # leased lines/sub + no Tier 1 POPs / Tier 2 POP * no T1s per POP
# for Tier 1 POPs 53
# for T1 subs 639
Total T1 CSU/DSU 692
Cisco 7513 router:
# of serial port cards 106.5 1 port for each business connecting here (from tier 1 and tier 2 areas) + 1 port for each Tier 1 POP/# of ports per card # of chassis 11.8 total # of required ATM and serial port cards/# of available slots per chassis
# of ATM cards 11.8 1 card for each router chassis to connect to the ATM switch
ATM Switches Node 1 Node 2 Node 3 Node 4 Node 5 Node 6 Node 7 Node 8 Node 9
# of T3s per node 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
# of OC-3s per node 7.3 7.8 7.3 30.9 30.7 31.1 7.0 7.5 7.1 Total
# of DS3 cards required 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
# of OC-3 cards required 1.8 1.9 1.8 7.7 7.7 7.8 1.7 1.9 1.8 34.1
# of ATM switch chassis 0.5 0.5 0.5 1.9 1.9 1.9 0.4 0.5 0.4 8.5
Scenario with Internet telephony
Tier 1 POPs # of POPs: 450 Tier 2 POPs # of POPs: 9 Total for all POPs
Cost Summary unit Quantity Quantity Quantity Quantity Quantity
Capital Equipment cost/month per POP all POPs Cost (%cost) per POP all POPs Cost (%cost) all POPs Cost (%cost)
analog modems $23 298 134100 $3,060,854 94% 1131 10179 $232,337 13% 144279 $3,293,191 66%
ISDN access router $5 14 6300 $32,154 1% 20 180 $919 0% 6480 $33,072 1%
POP server $652 0.2 69 $44,754 1% 2 17 $11,131 1% 86 $55,885 1%
content hosting server $261 0 0 $0 0% 0 0 $0 0% 0 $0 0%
LAN - 10 Mbps ethernet $3 9 4050 $10,565 0% 0 0 $0 0% 4050 $10,565 0%
LAN - 100 Mbps ethernet $13 0 0 $0 0% 27 240 $3,130 0% 240 $3,130 0%
56 kb CSU/DSU $13 0 0 $0 0% 265 2387 $31,132 2% 2387 $31,132 1%
T1 CSU/DSU $37 2.5 1130 $41,255 1% 1186 10677 $389,931 22% 11807 $431,186 9%
Cisco 2500 router $73.04 2 900 $65,736 2% 0 0 $0 0% 900 $65,736 1%
Cisco 7513 serial port card $417.37 0 0 $0 0% 181.4 1633 $681,571 39% 1633 $681,571 14%
Cisco 7513 ATM card $469.55 0 0 $0 0% 20.2 181 $85,196 5% 181 $85,196 2%
Cisco 7513 router chassis $1,565.15 0 0 $0 0% 20.2 181 $283,988 16% 181 $283,988 6%
Fore 4 port DS3 card $365.20 0 0 $0 0% 0 0.0 $0 0% 0 $0 0%
Fore 4 port OC-3 card $365.20 0 0 $0 0% 0 56.9 $20,767 1% 57 $20,767 0%
Fore ASX-200BX ATM switch $417.37 0 0 $0 0% 0 14.2 $5,933 0% 14 $5,933 0%
Total capital costs per tier $3,255,318 100% $1,746,036 100% $5,001,353 100%
Capital Equipment Quantities Tier 1 POP
analog modems:
peak combined calls per hour 462 taken from ’Tier 1 and Tier 2 call rate calculations’ chart on Transport page
avg holding time (min.) 36
Total number of modems per POP 298 = to the peak # of concurrent users
resulting sub/modem ratio 6.5 (just for reference - result is not used anywhere) ISDN access router:
peak calls per hour 2 taken from ’Tier 1 and Tier 2 call rate calculations’ chart on Transport page
avg holding time (min.) 36
Peak # of concurrent ISDN users 7
Total number of B channels required 14 # of concurrent users * 2 B channels per user POP server
# for analog dial-in users 0.15
# for ISDN dial-in users 0.00
Total POP servers 0.15
LAN sizing - # of 10 Mbps ethernet ports 9 allocate 1 switch port per 48 modems + router and server cxns
T1 CSU/DSU 2.5
Cisco 2500 router 2 1 for every 2 T1s
Tier 2 POPs analog modems:
peak combined calls per hour 1847 taken from ’Tier 1 and Tier 2 call rate calculations’ chart on Transport page
avg holding time (min.) 36
Total number of modems per POP 1131 = to the peak # of concurrent users
resulting sub/modem ratio 6.8 (just for reference - result is not used anywhere) ISDN access router:
peak calls per hour 7 taken from ’Tier 1 and Tier 2 call rate calculations’ chart on Transport page
avg holding time (min.) 36
Peak # of concurrent ISDN users 10 = to the peak # of concurrent users Total number of B channels required 20 # of concurrent users * 2 B channels per user POP server:
# for analog dial-in users 0.57
# for ISDN dial-in users 0.01
# for 56K users 0.27
# for T1 users 1.06
Total POP servers 1.90
content hosting server 0
LAN sizing - # of 100 Mbps ethernet ports allocate 1 switch port per 48 modems + router and server cxns
# for analog modems 23.6
# for ISDN 0.2
# for router 1.0
# for POP servers 1.9
# for content hosting servers 0.0
Total 100 Mbps ethernet ports 26.7
56 kb CSU/DSU 265 1 for each 56 kb sub. connecting here (from tier 1 and tier 2 areas)* # leased lines/sub
T1 CSU/DSU 1 for each T1 sub. * # leased lines/sub + no Tier 1 POPs / Tier 2 POP * no T1s per POP
# for Tier 1 POPs 126
# for T1 subs 1061
Total T1 CSU/DSU 1186
Cisco 7513 router:
# of serial port cards 181.4 1 port for each business connecting here (from tier 1 and tier 2 areas) + 1 port for each Tier 1 POP/# of ports per card # of chassis 20.2 total # of required serial port cards/# of available slots per chassis
# of ATM cards 20.2 1 card for each router chassis
ATM Switches Node 1 Node 2 Node 3 Node 4 Node 5 Node 6 Node 7 Node 8 Node 9
# of T3s per node 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
# of OC-3s per node 12.1 13.0 12.2 51.5 51.2 51.7 11.6 12.5 11.7 Total
# of DS3 cards required 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
# of OC-3 cards required 3.0 3.2 3.0 12.9 12.8 12.9 2.9 3.1 2.9 56.9
# of ATM switch chassis 0.8 0.8 0.8 3.2 3.2 3.2 0.7 0.8 0.7 14.2