London, 15 April 2008: Ethos Networks, a pioneer in connection oriented
Ethernet solutions, today announced that it has successfully completed
extensive interoperability testing with Nortel's Provider Backbone
Bridging Traffic Engineering equipment (PBB-TE) to boost Ethernet
capabilities for carriers and service providers. This announcement
follows testing by the two companies at Nortel's laboratory facilities
in Ottawa, Canada.

During the testing Ethos' deterministic end-to-end Network Management
System (NMS), part of the Ethos Carrier PBB-TE solution, managed and
monitored a Nortel PBB-TE network. PBB-TE is a key carrier Ethernet
technology pioneered by Nortel and being adopted in the industry to
deliver reliable Ethernet services. The two companies demonstrated
advanced capabilities that compliment PBB-TE technology as the transport
for Next Generation Networks.

Ethos FCAPS NMS and Nortel PBB-TE network interoperability included
managing and monitoring a PBB-TE network, including service & trunk
management. As a result of the extensive testing, Ethos' solution was
awarded the Carrier Ethernet Ecosystem certificate of compatibility.

Dr. Yuval Davidor, co-founder and CEO of Ethos Networks, explains:
"Carrier networks are becoming increasingly complex and complicated to
operate. Addressing this issue is one of PBB-TE's strong points. We
demonstrated several capabilities that not only simplify network
administration but can take carrier networks further. One example is how
we can combine PBB-TE's centralized control plane with Ethos
provisioning technology.

"The result is a multi-constraint provisioning that goes beyond path
selection, taking into account business aspects of services such as cost
of delivery, the prediction of bottlenecks and oversubscription and the
suggestion of optimal solutions. With a centralized control plane,
provisioning processes can be taken much further. We actually have it
all: offline powerful provisioning, rapid service deployments, global
and local optimization. Whilst we originally developed these
capabilities for Ethos' Dynamic TE Switches, the fact that they work
successfully with the products of two different PBB-TE vendors, is
testament to the virtues of PBB-TE technology."

"The Carrier Ethernet Ecosystem testing just completed with Ethos
Networks, demonstrates the momentum Nortel is seeing in the industry to
take advantage of Ethernet as a solution that is cost effective, simple
to use, and has the ability to grow network capacity as demand
increases," said Mike Adams, vice president of strategy and
architecture, Metro Ethernet Networks, Nortel . "Clearly the ability to
optimize the network as demonstrated with the Ethos Networks solution
will be a compelling value proposition to service providers looking to
scale their multi-vendor networks as PBT-enabled carrier Ethernet is
rapidly adopted worldwide."