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Chapter 1: Description and Requirements
Chapter 1: Description and Requirements
The E3Switch converters described herein are used individually to connect a customer's Ethernet LAN to an
ISP offering PPP over full or fractional/subrate DS3. The LAN interface is PPPoE RJ45 100/1000BaseTX
copper or SFP 1000BaseX fiber optic. The telecom link must be point-to-point and may support either
framed or unframed data. For point-to-point links without the overhead of PPPoE, consult our other
product documentation.
For ease of installation, the converter requires only minimal configuration setup via HTTP – typically
setting the CRC-length and scrambling state – and will then work immediately upon connection of LAN and
telecom cables.
The hot-swappable converter card draws a minimal amount of power and may be purchased in a variety of
chassis. Standalone, single units ship in high-reliability, fan-free 1U chassis with rackmount brackets and
are available in a 100-240VAC or a ±35-75 volt DC models. NEBS-III, redundant-power multicard chassis
are available in 6-slot/1U and 20-slot/3U versions.
The converter contains both an 8P8C(RJ45) LAN port and an SFP LAN port, allowing either optical or
copper LAN connectivity and HTTP or SNMP management of the converter either in-band or out-of-band.
Remote firmware upgrade to a converter is possible through either the LAN or DS3/E3.
The converter will buffer data, and implements flow-control and quality-of-service mechanisms to eliminate
data loss.
The converter can generate its own DS3/E3 transmit clock or use the incoming DS3/E3 received clock.
The converter will pass all PPPoE error-free packets unaltered which do not exceed 9600 bytes in length.
This included stacked-VLAN, QinQ frames and all modern router protocols.
The converter has been designed with attention paid to maximum throughput, minimum latency and
minimal packet loss. The converter is often both a cost-effective and bandwidth-efficient alternative to
routers. Even when connected to a LAN port from a router, eliminating a router telecom card can free up
expensive, limited, router backplane bandwidth .
The converter is plug-and-play and can often be installed in several minutes. Network topologies and
configuration settings of equipment connected to the converter can be complex, however, so additional time
should be allocated to achieve a properly functioning system.
Chapter 2: Quick Set-up
Attach E3Switch converter to DS3 BNC cable from ISP.
•
Set CRC-length, scrambling-on/off, framing-type, DS3-rate via the HTTP LAN interface.
•
Connect the PPPoE LAN-port of your equipment to either LAN port of the converter.
•
A connection from your PPPoE equipment to the ISP via username/password login with a blank session
name should now be possible.
In detail:
Attach the converter to a power source. The front panel lights should illuminate. Green is normal; orange
indicates an error.
6
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