
T D M P S E U D O W I R E
170
RAD Data Communications 2009 Catalog
During the last decade, pseudowire technology has
been established as the de-facto enabler for
migrating legacy communications services to
economical, higher bandwidth packet switched
networks (PSNs). Today, TDM pseudowires are
implemented in many mainstream services,
transparently carrying voice, video and data traffic
end-to-end over Ethernet, IP or MPLS backbones.
What are TDM pseudowires?
Pseudowire (PW) emulation is a method for transmitting
any Layer 2 protocol over packet switched networks. It
allows a seamless connection between two network
elements by creating logical links, or virtual tunnels,
across the packet network. In TDM pseudowires, the
transmitted E1, T1, E3, or T3 streams are encapsulated in
packets upon entering the network and then
reconstructed at the pseudowire egress, where clocking
information is also regenerated. As a result, real-time
traffic is delivered transparently without distortion,
avoiding the complexities of translating signaling data,
while ensuring that synchronization criteria are met.
The pioneering author of various pseudowire RFCs,
recommendations and implementation agreements, RAD
has been actively involved in the creation of the industry’s
major pseudowire standards by the IETF, ITU, MFA, and
MEF. Since first introducing TDMoIP pseudowire
encapsulation to the market in 1999, RAD has deployed
more than 60,000 pseudowire links worldwide. Our vast
expertise and industry-leading know-how create field-
proven solutions that ensure service continuity for TDM
applications, with full support for legacy equipment, such
as Class 4 and 5 switches, PBXs and TDM multiplexers.
RAD’s TDM pseudowire expert solutions
RAD offers a diverse mix of TDM pseudowire access
gateways – from small customer-located equipment, to
high-capacity aggregation units for central offices or
points-of-presence (POPs). The IPmux family of TDM
pseudowire gateways (see pages 172-179) handles full
E1/T1, fractional E1/T1 and E3/T3 streams right off the
user premises, while the Gmux-2000 (pages 180-181)
offers a modular chassis for aggregating and terminating
pseudowire traffic. Together, they provide circuit
extension over packet with VLAN-based service
differentiation, using any media, including fiber, copper,
HFC, microwave, and satellite access. In addition, the TDM
pseudowire access gateways incorporate dedicated ASICs
featuring all standard TDM pseudowire modes, with end-
to-end QoS and OAM attributes to meet service-specific
performance criteria.
RAD also offers innovative TDM pseudowire gateways in
an SFP (small form factor pluggable) format, maximizing
user flexibility with a simple and cost-effective alternative
to conversion cards. Designed for quick and simple
insertion into any Fast Ethernet device port with a
compatible SFP socket, the MiTOP-E1/T1 and MiTOP-E3/T3
simplify management and save on space, power
consumption and cabling (see page 182).
Compelling benefits
RAD’s TDM pseudowire access gateways offer a high
degree of flexibility in determining the migration path to
packet transport by allowing access agnostic delivery of
all services and transmission protocols. Other benefits
include:
• Enabling end-users to keep their existing equipment
• Eliminating the need to invest in separate, service-
dedicated networks
• Supporting quick and non-disruptive upgrade of legacy
services to future-ready networks
• Simplifying network management, maintenance and
operations
• Allowing more users to be served by the same
infrastructure
Who benefits from TDM pseudowires?
Incumbent carriers cut operating expenditures (OpEx)
and minimize customer churn by converging legacy traffic
with new revenue generators, such as E-Line and E-LAN
services, over cost-effective PSNs.
Alternative service providers and cable operators
with packet-based infrastructure grow their customer
base by adding traditional leased line and private line
services to their Layer 2 portfolio.
Enterprises
reduce their IT expenses on PSTN
connectivity and branch-to-branch communications by
consolidating PBX, ISDN BRI, video, and data traffic over a
single, economical Ethernet link.
7
TDM Pseudowire
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