Westermo DDW-221 - Manual (Page 9)

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Description
The DDW-221 is an Industrial Ethernet SHDSL extender with support for redundancy.
The redundant protocol can be used ether on the SHDSL interface or on the built-in
Ethernet switch.
Our unique FRNT (Fast Recovery of Network Topology) technology is the fastest pro-
tocol on the market to re-configure a network in the event of any failure of a link or
hardware.
SHDSL represents the best of several symmetric DSL technologies. This unit provides the
ability to reuse existing twisted copper pair with data rates from 192 kbit/s to 5.7 Mbit/s
in both directions. The DDW-221 makes it possible to communicate over 10 km
(6.2 miles) on twisted pair cable.
The DDW-221 is a bridge not router and so is simple to install. All configuration is done
using a web interface.
The DIN rail mounted DDW-221 is designed for harsh environments and can be used
in industrial and railway applications. It can be powered from two separate supplies and
handle an operating voltage range of 16 – 60 VDC.
Redundant protocol (FRNT) on SHDSL or on the Ethernet switch …
192 kbit/s to 5.7 Mbit/s …
Over 10 km (6.2 miles) on twisted pair …
Daisy chain SHDSL applications …
Wide temperature range (–40 to +70°C) (–40 to 158°F) …
Total galvanic isolation & transient protection …
Industrial and Rail EMC approvals …
Redundant power and wide DC input range …
Configuration using web interface …
Integrated 4-port Ethernet switch with 10/100Base-TX …
Auto MDI/MDI-X …
Auto speed on SHDSL with reliable, normal or high-speed mode …
Comprehensive statistics …
• SHDSL
• Ethernet
SNMP support …
Extensive line protection with over-current / voltage suppression …
Diagram showing speed versus distance
DDW-221 @ 0.5 mm 2 DDW-221 @ 0.4 mm 2
Speed bit/s Distance metre / miles Distance metre / miles
192000 10000 / 6.21 6450 / 4.00
1024000 7650 / 4.75 4850 / 3.01
1280000 7050 / 4.38 4700 / 2.92
2304000 5950 / 3.69 4150 / 2.58
3328000 4900 / 3.04 3700 / 2.30
4544000 4250 / 2.64 3150 / 1.95
5696000 3650 / 2.26 2800 / 1.73
Distance is tested without noise.