I n t r o d u c t i o n
The CHB 23 B is an 8-channel CIB-tech network component, with the purpose of extending the maximum
length of the CIB-tech network and simplifying the CIB-tech wiring by facilitating star-type topologies. It
connects the backbone bus of the CIB-tech network and up to 8 different CIB-tech bus lines
1
.
T e c h n i c a l S p e c i f i c a t i o n s
Electrical characteristics
●
Power Supply
The CHB 23 B can be powered from two sources: remotely from the backbone cable of the CIB-tech
network via the IBB-bus connector or locally through its power jack connector. The CHB 23 B favors
local power supply over remote power and uses it automatically if available; should the local power
supply fail, the CHB 23 B switches back automatically to backbone-supplied power. It should be
noted that this is not a desirable scenario unless the network is designed to be backbone-powered in
the first place, since the increased load on the backbone cable may lead to insufficient voltage on
the network section connected to the inadvertently remote-powered hub and / or may cause
overheating of the backbone cable itself.
○
Operating voltage range:
20 to 28V DC (nominal 24V DC)
○
Own power consumption (no hub-powered network segments connected)
■
Power supply via IBB-bus connector
●
Standby current (I
HS1
)
40mA
●
Maximum current (I
HM1
)
65mA
■
Power supply via dedicated power jack
●
Standby current (I
HS2
)
50mA
●
Maximum current (I
HM2
)
80mA
●
Power output
○
Output voltage = Input voltage – 0.3V
○
Maximum output current:
■
Via backbone bus connector (I
BBM
)
3A
■
Via bus connectors, each (I
BM
)
400mA
Power consumption of a hub is a function of the requirements of the network segments it is itself supplying
with power and can be found as the sum of all the network's and its own power consumption. At full load on
all segments, including power for other hubs via the output backbone connector (OBB), this would become:
I
HUBM1
= I
HM1
+ I
BBM
+ 8 x I
BM
= 6.265A for remotely powered hubs (via IBB) or
I
HUBM2
= I
HM2
+ I
BBM
+ 8 x I
BM
= 6.28A for locally powered hubs
However, if the hub is remotely powered from another hub via the backbone, it's I
HUBM
cannot exceed the
output power rating of the hub that powers it (I
BBM
), therefore such a remotely powered hub may not be
loaded to it's full load. For such a hub, the sum of all the power it's expected to deliver and consume must be
less than the amount of power available to it (I
BBM
):
I
HUBM1
= I
HM1
+ I
BB
+ I
B1
+ I
B2
+ I
B3
+ I
B4
+ I
B5
+ I
B6
+ I
B7
+ I
B8
< I
BBM
Locally powered hubs have no such limit and can be loaded to the maximum rating of their backbone and
bus outputs.
1 See “CIB-tech installation manual” for details.
CHB 23 B
©2009 - Intelligent Building Solutions
1
