Transcript No Slide Title

Narrowband
& IP Strategy
Steve Wickenden & Dave
Hughes
12 November 1999
Objectives
Explain issues for UK in current deployment of
Narrowband Networks
• Describe NB capacity demand and supply
• Identify drivers for change
• Provide an overview of BT’s 2 year plan
Inform OPF of our Dial IP proposals
• Provide an overview of Products and Pricing
• Provide an overview of deployment plans

Narrowband Core Network
Topology
DMSU
DMSU
74 DMSUs
(71 Sys X & 3 NGS)
DMSU
WAT/
DJSU
DLE

DLE
33 DJSUs/WATs
(32 Sys X & 1 NGS)
DLE
795 DLEs
BT Plans to increase Narrowband
Capacity
• Next Generation Switch
• Wide Area Tandems
• DLE Tandems
• Virtual Switch Location

Next Generation Switch
Replace System X DMSU/DJSU/WATs in fully
interconnected single tier network.
• First switch operational 9/99
• 3 switches now operational
• 6 switches operational 11/99
• 11 switches operational 3/00
• 39 switches operational 3/01

Wide Area Tandems
Provide access to/from directly connected
BT Local Exchanges
• 16 operational at
10/99
DLE Tandems
Provide access to/from directly connected
BT Local Exchanges
• First switch operational 4/00
• 80 switches operational 9/00

Virtual Switch Locations
Standard Interconnect Link
Operator
Network
P
O
C
BT Switch A
BT Switch B
Temporary Extension Circuit
Operators will interconnect temporarily with a switch other than that
requested - switch B rather than switch A
• BT meets costs of extending the Operators interconnect link to the offered switch
• BT meets costs of connecting Operators to requested switch when this is
replaced by NGS

BT Narrowband Demand Drivers
• Future demand is not “more of the same”
• PSTN future demand mix will be increasingly
dominated by interconnect calls
• Interconnect demand is being dominated by
Internet calls

Core Network “In Use”
Capacity Growth
100000
90000
80000
2Mbits
70000
60000
50000
40000
30000
20000
10000
0

BT to BT
OLO Internet
Other OLO
OLO Forecasts of Interconnect
Capacity for Internet Calls
30000
25000
2 mbits
20000
15000
10000
5000
0
Dec-98

Mar-99
Jun-99
Sep-99
Dec-99
Mar-00
Jun-00
Sep-00
06/98 Forecast
10/98 Forecast
03/99 Forecast
06/99 Forecast
09/99 Forecast
09/00 Projected Outturn
Narrowband Switch Limitations
• Not appropriate for long duration calls
• Inefficient transport for IP calls
• Higher unit costs compared to equivalent IP technology
• Narrowband solution may not deliver the optimum
consumer prices

Summary
1. BT’s plans will meet immediate demands on the
narrowband network
2. Calls to the internet are driving the expansion of the
BT and Operator Narrowband networks
3. Narrowband switches are not the best technology
to use for volume growth of Dial IP traffic
4. The Internet explosion could drive IP investment to
support Broadband Britain
