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Patton Resource Center |
Articles and Technical Tutorials about
Telecom, Datacom and Converged-IP Networking |
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Available Topics |
VoIP Intro
(VoIP Technology, Systems, Hardware, etc.)
VoIP in Use - Applications
(Software IP-PBX,
Call managers, FAX-over-IP, etc.)
Ethernet Extension
(Ethernet distance, LAN extension, etc.)
| Inverse
Multiplexer Technology
(T1/E1
Bonding, Jumbo Frames, MLPPP, etc.)
Industrial Networking
(T1/E1
harsh environments, NEMA 4, etc.) |
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Related Articles |
| Inverse Multiplexer >
Jumbo Ethernet Frames |
A jumbo Ethernet frame exceeds the maximum Ethernet frame size of 1518 octets as expressed in the IEEE 802.3 standards.
By increasing the payload size per header, jumbo
Ethernet frames reduce PDU overhead. Consequently, jumbo frames increase
throughput by lightening the processing load on network routers
and switches.
With Gigabit Ethernet emerging as a practical reality, the higher
transmission speed naturally calls for larger frames. Yet not
all Gigabit Ethernet vendors support jumbo frames.
In order for Ethernet to succeed as a transmission technology
for the Next-Generation-Network (NGN), jumbo frames
support will be required.
The emerging bearer network increasingly supports real-time
multi-media traffic concurrently with data. The associated
class-of-service and scalability requirements have multiplied
the number of network layers, tags and encapsulations in the
layer 2 PDU. Such technologies as VLAN per 802.1Q, Q-in-Q (VLAN stacked), MAC-in-MAC (PBB) and
MPLS/VPLS all increase the payload, and consequently, the size
of the Ethernet frame.
For transparent Ethernet extension across the wide area network
(WAN), support for transparent Layer 2 Ethernet bridging becomes the key technical
challenge. Any size Ethernet frame must be supported—including large Ethernet frames, mini-jumbo Ethernet frames,
baby-giant Ethernet frames as well as jumbo Ethernet frames.
When implemented in conjunction with T1
or E1 bonding, jumbo frame support makes inverse
multiplexer technology a viable and cost-effective solution
for high-speed Ethernet-over-copper—in both current and
next-generation carrier-provider networks. Jumbo frames allow VLAN, Q-in-Q (VLAN stacked), MAC-in-MAC (PBB), MPLS/VPLS, and Cisco ISL traffic
to flow transparently over the link.
Patton's Inverse Mux—the
Model 2888—supports jumbo Ethernet frames up to 9,216 octets
(bytes). The Model 2888
uses Using MLPPP
to bond 2 or 4 T1 or E1 circuits to create an Ethernet-over-T1/E1
connection at up to 8
Mbps. By supporting jumbo frames,
Patton's Inverse Mux can exploit existing T1 and E1 infrastructure to interconnect MPLS and PE routers
and deliver high-speed Ethernet backhaul for such real-time applications as
VPNs with VLAN stacking, Internet Access, VoIP and video over IP.
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