Bosch Appliances 3922 988 43318 manual Table-top units, Flush mounted units, Overload indication

Digital Congress Network Installation and Operating Manual Chapter 10 - Installation Techniques en 10-4

Max. number of units connected in series (without the use of extension cables)

The maximum number of units connected in series to a Trunk outlet or Tap-off of a CCU (LBB 3500), Extension Power Supply unit (LBB 4106/00) and Audio Media Interface unit (LBB 3508/00) is:

•Table-top units

-50 x Delegate/Chairman discussion units with a PCF value of 1(see Limit 1)

•Flush mounted units

-40 x Dual Audio Interface units (see Limit 2),

or 30 x Multi-purpose connection units (see Limit 2), or 50 x Channel selector units (see Limit 1),

or 24 x Delegate/Chairman Concentus units including interpreter desks with a PCF value of 2.5 (see limit 2).

Limit 1: The maximum cable length is 100 m (328 ft.). The length of cable attached to each unit is 2 m (6.5 ft.), therefore a maximum of 50 discussion units (50 x 2 m (6.5 ft.) = 100 m (328 ft.)) can be connected even though the maximum PCF value of 60 has not yet been reached.

Limit 2: The maximum total PCF value that can be connected to one outlet is 60.The Dual Audio Interface has a PCF value of 1.5 (40 x 1.5 = 60) and the Multi-purpose connection unit has a PCF value of 2 (2 x 30 = 60).

System overload

Each outlet socket is protected against short circuit at the power supply lines, and each has a red LED indicator (FIG 10-3)to indicate when the trunk-line has exceeded its maximum PCF value. In an overload situation, when the LED is lit, the system has a built-in delay time of 30 seconds before scanning the system again for a repeat overload situation. If the overload has been corrected the LED goes out. Refer to Chapter 10.2 Power Handling Capacity.

	Overload LED
	also applicable
	for LBB 4106/00
Port 1	Rec.	Line	Trunk
	In	In
Port 2	Out	Out	115 V -T4A 230 V -T2A
		Symmetrical

	LBB 3500/xx Central Control Unit
	Port 1	Rec.	Line	Trunk
	In		In
	Out		Out	115 V -T4A 230 V -T2A
			Symmetrical
				LBB 4106/00
				Trunk	Tap-off
	1st Tap-off				11 5V-T 4A 2 30V -T2A
	LBB 4114/00			In
				1st Tap-off
LBB 4114/00					2nd Tap-off
Tap-off	Trunk-line
				3rd Tap-off	LBB 4114/00
					2nd Tap-off
Tap-off	Trunk-line			4th Tap-off	LBB 4114/00
					3rd Tap-off
				5th Tap-off	LBB 4114/00
					4th Tap-off

FIG 10-3 Overload indication FIG 10-4 Tap-off limitations

Bosch Security Systems 04-2003 3922 988 43318 en Trunk outlets and Tap-offs