BT IPStream Products
James Appleton01/09/1999
2
BT IPStream Portfolio
IPswitch
ContentProvider
Corporate
High speed IP infrastructure with DSL access
ISP
IPStream Business
IPStream CentralEnd
user
3
Installation In End User Premises
ADSLNTERouter
IEEE802.3 10Mb/s Ethernet interface ontoend user PC or LAN
ATM25interface
Telephone line
NetworkTerminatingPoint
Splitter
End user’s computer(s) with TCP/IP stacks. At least one must run Netscape 4 or IE4.
4
End User NTE
• Terminates PPP session to ISP / Corporate– Session established via network IP switch
– Single session for all end users served by interface
• Provides IP over Ethernet presentation– 802.3 Ethernet at 10Mb/s
– Default subnet 192.168.254.0/24
– Can specify alternative when order service
– Up to 30 active hosts on subnet
• Features– DHCP into appropriate subnet (default range [1…20])
– Many One Network Address Translation
– DNS Relay
5
End User Line Rates
Product DownstreamLine Rate
UpstreamLine Rate
S500 512kb/s 256kb/s
S1000 1024kb/s 256kb/s
S2000 2048kb/s 256kb/s
Note:Line rates refer to total IP bit rate (header + payload).BT’s network is engineered for 20:1 contention ratio.
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Web Screen To Initiate PPP Session
7
Addressing In An IP Session
ISP/CC
Radius
End userpremises
ISP/CC allocates IP address and DNS resolver addressduring PPP session initiation
BTInfrastructure
DHCPDNS relayManyone NAT
ISP or Corporatepremises
Issue:NAT prevents applications transparency
ISP or Corporate administered IP address space
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IPStream Central Product Options
• Service Name String (eg CompanyName.com)• IP address pool
Line Rate Max Sessions Customer Interface512kb/s 40 X.21, 10baseT, 100baseT1Mb/s 40 X.21, 10baseT, 100baseT2Mb/s 40 X.21, 10baseT, 100baseT4Mb/s 900 X.21, 10baseT, 100baseT10Mb/s 900 10baseT, 100baseT34Mb/s 900 100baseT
9
AAAfunctions
BT IPStream InfrastructureRadius
Multi-ServicesPlatform (ATM)
RemoteAccessServer
End UserPremises
ISP or CorpPremises
NetworkTerminatingPoint (NTP)
NTP
ADSLNTE DSLAM
Radius
Home GatewayRouter
10
Overbooking & Protocol Layering
NTErouter
ADSLNTE
Homegatewayrouter
IP
PPP
L2TP
Ethernet ATM VC - 20:1 Overbooked
IP
RAS
MSP
ATM VP
ISP or Corpsets overbookingratio as required
LAN SDH SDH & MS
Product definesATM overbooking
DSLAM
DSLATM25
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