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Patton Resource Center |
Articles, White Papers and Tutorials about
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| Inverse
Multiplexer Technology
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Bonding, Jumbo Frames, MLPPP, etc.)
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Selected Topic and Article |
Related Articles |
| Inverse Multiplexer > Inverse Mux Equipment |
An Inverse
Multiplexer (a.k.a. Inverse Mux) is a networking device
that transmits a data stream from a high-speed link (e.g.
gigabit Ethernet) over a single high-speed communications channel
comprised
of multiple lower-speed circuits (e.g. T1 or E1). Inverse Mux equipment operates bi-directionally, so two devices are required, one on each end of the
circuit.
In contrast, a multiplexer
(a.k.a. mux) combines multiple low-speed
communication channels
(e.g. 64 kbps DS0s) into a single data stream for transmission over a higher-speed
circuit (e.g. 2048 kbps E1).
The terms appear similar on the surface. Yet the underlying
technologies represent different eras in networking with dramatically
different problems. The mux emerged
to address the problem of underutilization, or too much
bandwidth, whereas the inverse mux addresses the
current problem of not enough bandwidth.
The mux was designed for telephony networks to maximize
utilization of high-speed trunk lines
when user calls required only a fraction of the available
bandwidth. The inverse mux, on the other hand, is designed for
today's converged Ethernet/IP networks that support
bandwidth-intensive data, voice, video, and other media applications.
In regions where high-speed
fiber-optic cables are not yet available (or too costly for the
operator) an Inverse Mux provides a
high-bandwidth trunk by exploiting multiple existing copper lines.
By bonding multiple T1 or E1 circuits into a transparent
channel, (typically 4 or 8 Mbps), Inverse Mux technology bridges the
bandwidth gap between T1/E1 and T3/E3 lines.
Available in two (2)
and four (4) port models, Patton's Inverse Mux equipment—the
Model 2888—provides a 4 Mbps or 8 Mbps
transparent channel over bonded T1 or E1
circuits using MLPPP. With support
for large and jumbo Ethernet
frames, the IPLink™ Model 2888
Inverse Multiplexer can
interconnect MPLS and PE routers (that generate frames with multiple tags and
encapsulations, and deliver such real-time multi-service applications as
VPNs with VLAN stacking, Internet Access, VoIP and video over IP.
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