11
201109/UA1214UG_v1.1
User Guide - JBL Professional
®
UniAmp Power Amplifier Module , Model 1214
NEtWork CABLES
The type of cable necessary for correct operation of
the RS-485 network is twin twisted pair with each
pair individually shielded. Numerous cables of this
type are readily available and cables broadly meeting
the specifications given below (which are those of a
common commercially-available cable) are likely to
be suitable.
Additional information regarding network
connections and grounding strategies may be
obtained at :
www.jblpro.com
SPECIFICAtIoNS
Please refer to the download section of our website
for product specifications.
8. APPENdIX
PARAMETER
VALUE
Characteristic impedance
100 ohms
Capacitance (core to core)
41 pF/m
Capacitance (core to screen)
72.5 pF/m
DC resistance (core)
78.7 ohms/km
DC resistance (screen)
59.1 ohms/km