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CTI 2500 Installation and Operation Guide V2.8
39
Terminal Block connections to the trunk line should be spaced so that the total length of the
trunk line separating the taps is greater than the sum of the drop line lengths at the taps. In the
illustration below, L1 should be greater than the sum of L2 + L3.
Termination Resistors
Termination resistors must be installed at the ends of the trunk line. The resistor value required
depends on the trunk cable as specified in the table below
.
Cable Type
Resistor Value
Belden 9182
150 ohms, 5%, ¼ W
Belden
®
9860 or 9271
120 ohms, 5%, ¼ W
4.3 Dual RBC Support
Firmware version 6.17 and above includes support for dual Remote Base Controller (RBC)
configurations using an RS-485 network. Coaxial dual media cabling is not supported.
A dual RBC configuration consists of two remote base controllers installed in a special base
(CTI 2500-R11-A or Siemens 505-6511). These bases also support the installation of dual
power supplies, providing redundant sources of power
The dual RBC configuration provides redundant control of the I/O base. When power is applied
to the base (and two RBCs are installed and operational), the RBC in the rightmost controller
slot assumes the role of the active RBC, reading and writing the base I/O. The other RBC
TB = Terminal Block
TB
Remote
Base
Controller
Remote
Base
Controller
Remote
Base
Controller
TB
Remote
Base
Controller
OR
Remote
Base
Controller
TB
Remote
Base
Controller
TB
L1
L2
L3
Содержание 2500-C100
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