CTC Union VDTU2A-301, User Manual, Page: 7 / 16

Chapter 1. Introduction
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Chapter 1. Introduction
CTC Union’s VDTU2A-301 LAN Extender is a Long Reach Ethernet media converter with
one Ethernet port (RJ-45 connector) and one VDSL port (RJ-45 connector) This model is a
bridge mode modem, well accommodating VDSL2 (Very-high-data-rate Digital Subscribe
Loop) technologies to extend Ethernet service over single-pair phone line. Supporting both
symmetric and asymmetric transmission, it can reach up to 100/75 Mbps bandwidth (line rate)
within 300M or 10/10 Mbps (line rate) for 1 Km long range connections. By providing ultra-
high speed, VDTU2A-301 LAN Extender makes your telephone line achieve its best
performance than before. It has the advantage of minimum installation time (simply as plug-n-
play) and minimum expense by allowing video streaming and data to share the same
telephone pair without interference.
1.1 Features
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Cost effective bridge function to connect two Ethernet LAN
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Support flow control on Fast Ethernet port via PAUSE frame or Back Pressure
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IEEE 802.1Q VLAN tag transparent
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Easy installation via simple plug-and-play
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Selectable CPE and CO mode via DIP switch:
Two working modes are built in the same unit, which keep the flexibility of
installation and easy provision of service but lower inventory of service provider.
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Selectable fast and interleaved mode:
Fast mode guarantees a minimum end to end latency less than1 ms. Interleaved
mode provides impulse noises protection for any impulse noise with a duration less
than 250 us, Interleaved mode has a maximum end to end latency of 10 m sec.
Interleaved mode is the default mode.
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Selectable target data rate and target SNR margin:
User has the ability to select fixed SNR margin (9 dB) or fixed target data rate.
When fixed SNR margin is selected, the systems will maintain the SNR margin at 9
dB across all usable loop length. When fixed target data rate is selected, the
system will lock the data rate up to 50 Mbps/30 Mbps whenever the calculated
SNR margin is higher than 9 dB. This gives best system stability and is the default
mode.