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| To
understand the QoStream™ product family is to understand
how tomorrow's services can be deployed today in a highly
cost-effective way. Implementing an ESON architecture with
Amedia's QoStream™ products provides the scalability,
reliability, security, and flexibility to meet the needs of
the most demanding customer. |
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| The general categories of data networking
services supported by QoStream™ networks are (1)
Private Line Ethernet Services, (2) Transparent LAN
Services, and (3) Business Internet Access. Private
Line Ethernet Services are Layer 2 frame forwarding
services that provide point-to-point interconnection
between customer sites. Transparent LAN Services are
mult-location services that provide layer 2 frame forwarding
connections among two or more customer sites using customer-defined |
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VLANs that are preserved throughout the network. Business
Internet Access Services are interconnection services that
provide a range of level 2/3 features enabling enterprise
customers to connect to IP networks and services, including
the public Internet.
QoStream data networking connections can be established with
or without VLAN tags using different kinds of service guarantees.
QoStream VLANs can be thought of as extensions of intra-building
LANs to a wide area network, using Ethernet under optical
networking technology. Today, nearly all deployed building
LANs are Ethernet LANs, and a very large fraction of those
are 100 BASE-Tx LANs. It is convenient, therefore to use 100-BASE-Fx
protocol on the fibers exiting a building to provide a natural
extension of the 100 BASE-Tx LAN to remote sites.
Pre-provisioned VLANs provide isolation among data networking flows, enabling
secure networking among computers and servers for many applications, including
such sensitive applications as physician or pharmacist access of hospital records
and databases, enterprise access of financial data and records, and law enforcement
agencies access of criminal records. The VLANs effectively serve as a firewall,
keeping secure the data flows in the user group or the individual connections
from all unauthorized sources or destinations.
The terminating PG1000s mark the data packets with VLAN tags, and these tags are
used to switch the packets throughout the network to only that identified destination.
Each VLAN is independent, with no packet origination or destination allowed outside
the user group or connection identified for that VLAN. The data packets may originate
and terminate on wired or wireless LAN connections to PCs or servers as the figure
indicates.
Often data networking VLANs are established with a Best Effort
service guarantee, owing to the relative insensitivity to
impairments such as dropped packets, delay, and jitter that
can occur when sufficient network resources are not available
in oversubscribed or congested networks. QoStream provides
four Best Effort priority levels for BE traffic management
flexibility, but Guaranteed Bandwidth (QoStream provides GB
from 1 Mbps to 100 Mbps in 1 Mbps increments) and Bursty Bandwidth
(Guaranteed Bandwidth plus overflow prioritized over all Best
Effort priorities) service guarantees are also available for
data networking VLANs. Business applications often require
Guaranteed Bandwidth or Bursty Bandwidth service guarantees
for critical traffic and Best Effort service for less critical
traffic.
Data networking connections to an external network such as the Internet or an
Intranet are achieved by tagging the packets at the originating PG1000 to traverse
the network to the Core Switch, which provides GbE ports to the desired network
gateway.
Data networking connections can be made to the Internet via a router that serves
as an Internet gateway. For this application, the terminating PG1000 marks the
data packets with VLAN tags, and these tags are used to switch the packets through
the network to the Core Switch. The data packets may originate and terminate on
wired or wireless LAN connections to PCs or servers.
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