Transcript PowerPoint Presentation - Slide 1

Differentiators: flow-based preference control,
focused discard of selected flows if capacity limits
reached, available rate service, flow-based monitoring
(cheaper than DPI)
Remote
FSA
Content
source
Bandwidth shared by
multiple flows to multiple
end-systems.
IP core
EndSystem
FSA
End-point
Manager
Initially
no content
is assumed to
be FSA
Later..
Local
FSA
Content
source
FSA
downstream
signalling
& focused
discard
control
Service
Provider
In-band signals co-ordinate flow-based QoS actions, especially:
• flow accepted but flow vulnerable to discard (MR service)
• flow preference priority.
• current available rate (AR service).
• current available rate + minimum rate (VR service).
There is also a Guaranteed Rate service (GR) that requires admission
Control prior to the start of transmission of data.
Standards developed from TIA 1039 and Y.2121.
Back-up
slides
draft-adams-tsvwg-flow-signalling-codepoint-00
Discusses more details about the desire for a new
IPv6 codepoint to indicate in-band FSA signalling
Broadband services will typically utilize Ethernet as the layer two protocol.
PPPOA over DSL will be replaced by PPPOE and PPPoE between
the MSAN and the service provider BRAS.
An alternative of Bridged Ethernet between the MSAN and Service
provider BRAS is also an option.
• Broadband services will be supported by incorporating an Ethernet
MAC layer as defined in PPPoE.
• The use of DHCP to allocate IP addresses becomes an option
following the incorporation of the Ethernet MAC layer
and needs to be considered longer term in order to enable
PPP to be removed
Native Ethernet
native Ethernet functionality may include:
802.1ad (VLANS, and Q in Q) , moving to
802.1ah (MAC in MAC)
Ethernet enhancements for carrier grade
scalability including:
Link Aggregation
OAM
IEEE/ITU IEEE 802.1ag Ethernet OAM
EFM & MEF OAM
Potentially MEF Ethernet UNI
Preservation of Network & Customer timing
over Ethernet
Four fibre systems from
MSAN node to parent
Metro Node
Metro Node
MSAN Node
Dual lead in with
duct bypass
MSAN Node
Physical ring
MSAN Node
Dual lead in with
duct bypass
Metro Node
MSAN Node
For a minority of the most stringent applications (e.g. Broadcast TV or financial
data applications), it is very unlikely that 1:N or even 1:1 network based protection
switching will provide the required level of performance. For these applications the
customer may require two diverse physical paths. The customer would then
transmit over both paths and at the receive end would time align the two signals
(by short buffer) such that they could seamlessly switch between them on failure
of the active feed.