Intelligent Building Solutions CHB 23 B Installation Manual

Installation Manual

CHB 23 B

NETWORK HUB

● up to 8 BUS lines

● Desktop

CIB-tech

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 lines1.

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 IBM = 6.265A for remotely powered hubs (via IBB) or

I

HUBM2

= I

HM2

+ I

BBM

+ 8 x IBM = 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

+ IBB + IB1 + IB2 + IB3 + IB4 + IB5 + IB6 + IB7 + IB8 < 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

Mechanical characteristics

The CHB 23 B has a beige, flat, desktop-type enclosure.

● Dimensions: 145mm W x 190mm L x 31mm D

● Weight: 315g

Environmental characteristics

● Operating temperature: -10ºC to 85ºC

● Storage temperature: -25ºC to 100ºC

K e y F e a t u r e s

● Connects backbone with up to 8 bus lines

● Can be powered via backbone bus connector or via dedicated power connector

● Provides power via the bus lines to the connected devices

● Can provide power to other CIB-tech hubs

● Internal power LED (active for both remote or local power)

I n s t a l l a t i o n

The CHB 23 B is a desktop hub that requires no special mounting; it can be placed in any suitable rack
cabinet or junction box at the CIB-tech bus junction.

Part description

● Bus connectors:

○ 4P4C modular jack connectors for connecting CIB-tech bus lines (other CIB-tech devices)

1

○ The CHB 23 B has 8 (B1 to B8) functionally identical bus connectors

● BUS EOL switches:

○ End Of Line switches for CIB-tech bus lines
○ every BUS EOL switch corresponds to the bus connector above it

● IBB bus connector:

○ “Input backbone bus connector” - 8P8C (RJ45) modular jack connector for connecting the CHB

23 B device to the backbone of the CIB-tech network

○ A CHB 23 B device can be powered remotely via this connector

● OBB bus connector:

○ “Output backbone bus connector”- 8P8C (RJ45) modular jack connector for connecting the CHB

23 B device to the backbone of the CIB-tech network

○ Power can be delivered to other CIB-tech devices (mostly other hubs) via this connector

● BB EOL switches:

○ End Of Line switches for the CIB-tech system's backbone bus

1

● LED:

○ Power-on LED

● Power switch:

○ main power switch for the CHB 23 B. This switch enables/disables powers for the CHB 23 B

and the bus lines; Note that the OBB bus is always powered, it dose not depend on power switch
state

● Power connector:

○ 2.1mm female power jack connector for main power supply (if the device is powered via this

connector it disconnects from the IBB bus supplied remote power)

1 See “CIB-tech installation manual” for details.

CHB 23 B ©2009 - Intelligent Building Solutions 2