W2940305 Rev 07 8/2019 Dover Fueling Solutions 73
C.10 Ethernet Connection
When connecting the T7 directly through an Ethernet cable, a hardwired connection must be
made to the dispenser(s). To meet code and for proper operation, the following must be
adhered to:
Standards For trouble-free operation, Ethernet cable should be installed by a qualified
telecommunications technician in accordance with ANSI/TIA/EIA 568-A
Commercial Building Telecommunication Cabling Standards (and
Amendments). It is highly recommended that for other than very simple site
layouts or for when the systems will be connected to an existing LAN/WAN, a
qualified engineer be used to design the network for this system. Network
wiring should be tested according to ANSI/TIA/EIA TSB 67 prior to use.
Cable As the cable for this connection is passing through a fuel island hazardous
area, a cable that is rated for such use must be used. The following cables are
rated to be oil and gas resistant:
Belden 7928A Category 5e cable
Belden 7931A Category 6 cable
Madison 042GA00006 Category 5 cable*
*
Note: Madison Ethernet cable can be purchased from DFS using Part Number 891052-
002. The cable can be purchased in 500 feet increments.
Distance The maximum distance recommended for a single Ethernet hardwired run is
100 meters (328 feet). Distances exceeding this length must employ a switch
or some type of repeater device within every 100 meters. DFS recommends
that for sites exceeding 200 meters from the controller to the furthest dispenser
(even with multiple switches/repeaters) or for systems requiring more than 2-3
switches/repeaters in the same line that a network engineer be used to design
and test the site. Home runs to a centralized switch are recommended
whenever possible to minimize the impact of a potential defective switch (or
repeater). Wireless modems can be used to handle long runs.
Conduit For all T7 Fleet installations, the Ethernet cable must be installed in its own
conduit to all T7 Fleet dispensers (and between dispensers if relevant).
The
run of Ethernet cable must be uninterrupted from the building to the
switch in the dispenser electronic head.
The conduit is to be routed directly
from the contractor installed seal-off at the bottom of the dispenser to the fitting
provided at the vapor barrier below the T7 Fleet electronics area. A hole
already exists for a ¾” conduit in the vapor barrier for this fitting connection.
This opening is sealed from the factory using flat washers, a bolt, and a nut.
When installing the cable, allow the Ethernet cable to extend at least 30” above
the vapor barrier. For proper assembly and potting of the cable, see section
3.3.7 of the Electrical wiring section.
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