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QoStream™
Ethernet Switched Optical Networking (ESON) system architecture.
| A Core Ethernet L2/L3 Switch communicates to
Aggregator Switches using standard symmetrical GbE optical
signals. The Core Switch interfaces multiple content
and service providers over an MPLS-based Metro or Regional
network to deliver data, video, and voice content to
the users on the access network. Subscriber-to-subscriber intra-community
voice communication remains within the access network, but
voice calls to a subscriber on the Public Switched Telephone
Network uses a Core Switch interface through a standard PSTN trunking |
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gateway, with a standard MCNP/NCS call agent
establishing the call. Since the network interfaces
are standard optical GbE packet streams, the Core Switch can
easily switch these signals to individual GbE Aggregator Switch
connections to deliver these services to subscribers through
Premises Gateways.
The Aggregator Switch interfaces one or multiple GbE signals
from the Core Switch and interfaces the traffic to multiple
Premises Gateways using standard 100Mbps optical links. The AS5000 will also support
DMT-coded VDSL line cards
in order to provide standards-based Ethernet access over copper twisted pairs.
Depending on the distance between the AS5000 and the premises, the VDSL-optioned configuration will be able to offer between 20 Mbps to 100 Mbps of symmetrical bandwidth.
The
AS5000 switches traffic within its own Premises Gateway community
with wire line performance. The Aggregator Switch can reside
in CO-like buildings as well as in outside plant cabinets
to meet the needs of the network operator. An AS5000 can support
its Premises Gateway community independently, or multiple
Aggregator Switches can be chained to provide increased concentration
for the GbE signals. The Aggregator Switch delivers a 100
Mbps digital stream to each PG1000, but the traffic on these
streams depend on the specific bandwidth and service guarantees
to which the end customers subscribe for the delivered services.
Thus, the end customer may subscribe for guaranteed bandwidth
from 1 Mbps to 100 Mbps, best effort service with any of four
priority levels, or bursty service guarantees, with any mix
of these service guarantees for any VLAN.
Each Premises Gateway interfaces a 100Mbps transport stream
and provides up to 100Mbps of full suplex symmetrical traffic
bandwidth to its subscriber(s) with the mix of guaranteed,
bursty, and best effort service guarantees that the end user
requires for each VLAN. The PG1000 can interface separate
premises-wired LAN connections for broadband data, video,
and VoIP services, along with POTS telephones and appliances.
In addition, the PG1000 introduces a residence or business
802.11 “hot spot” for wireless access within the
premises.
Data networking services can be implemented with or without
packets marked with Virtual Local Area Networks (VLAN) tags.
For tagged operation, VLAN tags are established at the PG1000
on the individual packet flows to create a virtual LAN within
the home, across town, across the country, or around the globe.
These VLAN tags allow user groups of PCs and servers to operate
with isolation to all other traffic in the network. The VLAN
can exist within an Aggregator Switch community, or a Core Switch
community. Internet
access is provided at Core Switch locations through a gateway.
For video services, VLAN tags provide complete isolation from
user to user and service provider to service provider, ensuring
that video content is distributed to only those end users that
have subscribed for it. One video channel is sent for each television
set at a given time, with fast-acting sessions between the video
servers and Set Top Boxes supporting fast channel surfing and
digital video recorder functions. An intelligent multicast structure
closest to the end user makes optimum use of network resources,
for example delivering only a single copy of a broadcast or
PPV video channel by the Core Switch to the Aggregator Switches
for distribution to those multiple Premises Gateways whose end
users have selected that channel.
For voice services, the VLAN tags provide isolation for conversations
involving any mix of VoIP and POTS telephones and appliances
connected to Premises Gateways and the PSTN. For example,
a neighborhood call can be completed entirely within an Aggregator
Switch community or within a Core Switch Community. A PG1000
session with a standard call agent establishes and removes
the connections, and the PG1000 provides the necessary BORSCHT
and digital signal processing functions to support intra-community
and PSTN calls using VoIP and POTS telephones in any mix at
the various ends.
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