XtendLan XL-GDB101V, User Manual

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XtendLan XL-GDB series User’s Guide
Chapter 1: Product Description
1.1 Introduction
The XL-GDB SHDSL access system provides high-speed data access over single-pair copper
wires. It can transmit up to 2.304 Mbps V.35 or Ethernet signal without a repeater for more than
7km (24 AWG line) at a Bit Error Rate of less than 10
-7
. Using SHDSL transmission technology,
the XL-GDB SHDSL network access system allows fiber quality transmission on a single pair of
copper wire. Using lower gauge larger copper wire may allow you to attain greater
distances.
1.2 Product Interaction
XL-GDB desktop SHDSL modem that is part of the XtendLan SHDSL access system. Used in
conjunction with the XL-GDB shelf type CO (Central Office) line card or desktop SHDSL modem,
the unit provides repeater less data transport of up to 2.304 Mbps, over a single pair of
unconditioned copper wire. Also models with 2-pair transmitions provide rates up to 4.096 Mbps.
The rate is automatically adjusted to synchronize at specified rates, corresponding to the distance
between the local and remote units. For instance, under the E1 transmission specification, the
data rate is software selectable at any of the available Nx64 kbps rates where N is from 3 to 32.
(see chart 1, ).
Chart 1: Transmission Distance (2wire, w/o noise)
Speed (kbps)
vs. cable diameter 2048 1544 1024 768 512 384 256 192 128 64
0.4 mm 3.2km 3.6km 4.5km 4.8km 5.1km 5.3km 5.7km 6.3km 6.3km 6.3km
0.5 mm 3.6km 3.9km 4.8km 5.1km 5.8km 6.3km 7.4km 8.0km 8.0km 8.0km
Chart 1: Transmission Distance (4 wire, w/o noise)
Speed (kbps)
vs. cable diameter 4096 3072 2048 1756 1024 768 512 384 256 128
0.4 mm 3.2km 3.6km 4.5km 4.8km 5.1km 5.3km 5.7km 6.3km 6.3km 6.3km
0.5 mm 3.6km 3.9 km 4.8km 5.1km 5.8km 6.3km 7.4km 8.0km 8.0km 8.0km
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