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2BASE-TL offers a nominal symmetric bandwidth of at least 2 Mbps in a typical noise environment at reasonable distances 2BASE-TL is based on the same physical layer
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as the enhanced SHDSL standards of ITU and ANSI T1 (also known as G9912bis or E-SHDSL ) Whereas symmetric high-speed DSL (SHDSL, G9912)  has a maximum symmetric rate of 23 Mbps, enhanced SHDSL can run up to 57 Mbps on a single pair With such high-speed symmetric access, subscribers can be offered a 10 Mbps Ethernet service on as little as two-pair of copper access lines (the same lines that are used for telephony services) 2BASE-TL and enhanced SHDSL increased the bandwidth over SHDSL in two key dimensions First, a second constellation (or symbol encoding) is allowed that increases the throughput by 33 percent without affecting the spectral properties of SHDSL This additional higher constellation cannot be used on the longest loops, but it does provide a spectrally free throughput increase on loops up to 10 Kft (3 km), depending on the noise environment Second, 2BASE-TL and enhanced SHDSL increase the frequency (number of symbols per second) as compared to SHDSL, thus allowing even more throughput This frequency addition increases the noise created by the technology, but it still falls within North American and international spectral guidelines such as ANSI T1417
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The EFM short-reach solution is based on very high-speed DSL (VDSL)  One of the major technical decisions of the EFM task force was to decide which VDSL technology was best suited for the short-reach Ethernet physical layer At the time, there were two VDSL candidates One candidate was based on Discrete Multitone Modulation (DMT), and the other was based on Quadrature Amplitude Modulation (QAM) Both technologies could yield similar performance results yet only one could be selected Until EFM forced a decision, both technologies had progressed equally through ITU and ANSI T1 standards bodies, with no organization able to select a single solution After many months of debate, the EFM task force voted to use VDSL-DMT as the physical layer for 10PASS-TS instead of VDSL-QAM The hope that VDSL-DMT could leverage the technology and volume of ADSL (which is also based on DMT technology) was a key factor in the selection process
Spectral Compatibility and International Applications
As an international standard, it is important for Ethernet to be deployable anywhere in the world EFM technologies are basis systems, which means they are universally deployable throughout the world These technologies are capable of operating under different spectral guidelines depending on where in the world they are deployed Different spectral guidelines yield different performance results, so the effective throughput of the technology is limited by the governing spectrum rules of the local country EFM technologies are internationally deployable anywhere in the world, provided they are configured to conform to the regional guidelines
Transporting Ethernet Packets over Copper
A long-standing tradition in Ethernet is that the method for carrying the actual frames over the wire must (1) have low overhead and (2) be incredibly resilient to false packet acceptance False packet acceptance (FPA) is the probability of undetected corruption The EFM copper technologies use a novel encoding scheme called 64/65-octet encoding, where there is 1 overhead byte for every 64 bytes of data This encoding scheme is incredibly efficient, which is vital in access technologies that must adapt to the environment and deliver the highest possible speed given existing outside plant conditions Unlike traditional LAN Ethernet, the cable plant for Mid-Band Ethernet is old, uncontrolled, and irreplaceable (if it is going to be replaced, it will be replaced with optical fiber) Therefore, the technology must adapt to any cable plant quality and be very efficient to best utilize any environment Figure 52 illustrates 64/65-octet encoding Using this encoding, the physical layer is partitioned into 65-octet blocks, and in each 65-octet block, up to 64-octets can hold data and 1 octet is used for synchronization purposes This makes the encoding very efficient Additionally, depending on the contents of the 64-octet block, the first byte of