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1/29/2007
#26567
Extending an Ethernet network.
The 10BASE-T/100BASE-TX G.SHDSL Two-Wire Extender/
NTU (LB510A) has an RJ-45 interface for 10-/100-Mbps network
links and a G.SHDSL network termination unit (NTU) for
accessing IP services over the two-wire infrastructure. It’s unique
because it has both a built-in Ethernet port and TDM-based
G.SHDSL network access for maximized bandwidth.
Working as a low-cost customer premise equipment (CPE)
solution, the LB510A delivers long-range, dedicated, bridged-
Ethernet connections to distant users or customers running
bandwidth-intensive applications.
In an enterprise environment, you can use the 10BASE-T/
100BASE-TX G.SHDSL Two-Wire Extender/NTU to extend your
corporate LAN across a campus or across town to deliver
services to users at the higher speeds. The LAN port on the
LB510A autosenses 10BASE-T/100BASE-TX connections to match
your local network speed and autonegotiates for full or half-
duplex connection. It also has an MDI-X button on its front
panel that enables you to switch between network-side
straight-through and crossover cabling.
For easy management, the 10BASE-T/100BASE-TX model
features an embedded Web server and can be configured
remotely from an IP network-based GUI simply by entering the
LB510A’s IP address into a standard browser. Because it has an
EOC management channel, the extender/NTU can be remotely
managed end to end.
The LB510A also features an IEEE 802.1d transparent
learning bridge up to 1024 addresses, uses the Spanning Tree
Protocol, and has built-in ping and traceroute facilities.
Comprehensive hardware diagnostics on the 10BASE-T/
100BASE-TX model enable you to easily maintain and install
the unit independent of your operating system.
Extend an E1/T1, X.21, or V.35 network.
Although similar in size and function to the LB510A, the
E1/T1, X.21, and V.35 models differ not only in their interface,
but their diagnostics and clocking modes, too.
With these G.SHDSL Two-Wire Extender/NTUs, you can
run local and remote loopbacks, including both local analog
loopbacks (LALs) and remote digital loopbacks (RDLs). The
V.35 model can also be used to enable DTE loops.
You can also run basic error rate (BER) tests with the E1/T1,
X.21, and V.35 extender/NTUs. They include an internal PRBS
pattern generator and detector that you can use to run tests
of this type without the need for any external equipment.
For controlling DSL and serial clock sources, the E1/T1,
X.21, and V.35 models support internal or receive recover
clock modes. The V.35 and X.21 models also support external
mode clocking, and the E1/T1 model also supports network
clocking.
With a G.703/G.704 interface on a pair of BNC connectors
as well as an RJ-48C jack, the E1/T1 G.SHDSL Two-Wire
Extender/NTU (ME231A) suits both balanced and unbalanced
E1/T1 connections. Use the dual BNC (TX and RX) to connect
a 75-ohm dual coax E1 or T1 network interface and the RJ-48C
to link to either a 120-ohm E1 or 100-ohm T1 twisted-pair
network interface.
The X.21 G.SHDSL Two-Wire Extender/NTU (ME232A) has a
DB15 connector, which by default is configured as data circuit
terminating equipment (DCE) for connection to data terminal
equipment (DTE), such as a router. But you can also use the
X.21 interface configured as DTE for connecting a DCE, such
as a modem or multiplexor. In either case, connect DTE or DCE
devices with an X.21 straight-through cable.
Supporting connections to V.35 serial equipment, the V.35
G.SHDSL Two-Wire Extender/NTU (ME233A) has a DCE
interface on a DB25 connector. Use this interface to connect
to DTE equipment, such as a router, through a V.35 straight-
through cable. To connect to another DCE device, such as a
multiplexor or a G.703 NTU, simply add a tail-circuit cable.
NOTE: Actual distance and link performance may vary
depending on the environment and the gauge and type
of wire you use.
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