Quadnet Control Panel Engineering and Commissioning Manual
22
Network
Network Topology and Cabling
In order to use the networking features of the Quadnet system, each control panel must have the optional
Quadnet network card fitted onto the control panel main PCB (CIE). Quadnet repeater panels automatically
include this network card as standard since repeaters can only be used on the network.
The Quadnet network may be connected as shown below. The network may comprise of control panels or
repeater panels as required, up to a maximum of
4
nodes. In addition to the connections shown, each panel
will require a 230V AC supply and the power supply arrangements relevant to that panel.
Any network port at a control panel may be connected to any other network port at any other control panel.
A list of these connections must be noted during termination as they will need to be configured to each
control panel for correct operation.
The network connection circuit must be installed as a single ring, with a maximum cable length of up to 1km
between network nodes.
All system wiring should be installed to comply with BS 5839: Pt1: 2002: Amendment 2: 2008 and BS 7671
(wiring regulations), along with any other standards relevant to the area or type of installation. A cable
complying with the BS 5839: Pt1: 2002: Amendment 2: 2008: Category 1 (cables required to operate for
prolonged periods during fire conditions) is required. This must be a 2-core 1.5mm
2
screened fire resistant
cable (ie. MICC, FP200, Firetuff, Firecell, Lifeline or equivalent).
In order to protect against possible data corruption it is important to ensure the following points are adhered
to:
1. The cable
screen between each network node (panel/repeater) must be connected to
SCRN Terminal at one end only
using the terminals provided. Ensure that the end that is not
connected is safely terminated in a connector block to avoid unwanted shorting to any other
point.
2. Do not use a 4-core cable as a loop
feed & return
due to the possibility of data corruption. It is
essential that two 2-core cables are used if this is required.
3. Excess cable lengths must not be coiled as coiling will increase the inductance and cause
communication problems
.
Network Cable Specification
Max Capacitance Core to Screen ................................................... 180pF / m
Max Capacitance Core to Core ....................................................... 100pF / m
Max Inductance ............................................................................... 1.0mH / km
Max Resistance Two Core Screened 1.5mm² ................................
12.1Ω / km
Fire Proof ........................................................................................ BS5839: Pt1: 2002 Category 1
Example .......................................................................................... Datwyler 8700