Bosch Appliances 3922 988 43318 manual Pcf

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

Y
60
55	60
50	54	60

en 10-8

Port 1	Rec.	Line	Trunk
In		In
Out		Out	115 V -T4A 230 V -T2A
		Symmetrical

	45		49		54		60
	40		44		48		53		60
	35
			38		42		47		52		60
	30		33		36		40		45		51	55	60
	25		27		30		33		37		43	46	50	55	60
	20		22		24		27		30		34	37	40	44	48	54	60	60
	17
	15		16		18		20		22		26	28	30	33	36	41	45
	10
			11		12		13		15		17	18	20	22	24	27	30
value
	5		6		6		7		8		9	9	10	11	12	14	15	17
																				X
PCF	0	20		40		60		80		100		120	140	160	180	200	220	240	250
		Ext. Cable (m)

FIG 10-10 Graph for calculating the PCF value of a system including extension cable length correction

10.4.2 Graph explanation

The Y-axis of the graph gives the PCF per trunk-outlet (max. 60 PCF) in relation to the X-axis, which gives the length of extension cable used (max. 250 m (820 ft.)).

If the length of cable from the Trunk outlet exceeds 250 m (820 ft.), the graph shows that no units can be connected. At 240 m (787 ft.), the graph shows that a PCF of 17 can be connected. For an example of a single trunk-outlet limitation refer to FIG 10-11and FIG 10-11.

For typical PCF graph references in relation to Trunk outlets and Tap-offs for systems with and without extension cables refer to FIG 10-12.

LBB 3500/xx

Trunk splitter LBB 4114/00

Trunk splitter

LBB 4114/00

Trunk splitter

LBB 4114/00

100 m (328 ft.)

Regenerative ‘Tap-offs’

100 m (328 ft.)

Regenerative ‘Tap-offs’

240 m (787 ft.)

Max. PCF = 17 at 240 m (787 ft.) acc. to the graph. The first two Trunk splitters use 2 PCF, therefore the PCF value left at this point is 15.

250 m (820 ft.) (max.)

5 x 2 = 10 m

(32.8 ft.)

Discussion units

FIG 10-11 Example Single Trunk-outlet limitations

Bosch Security Systems 04-2003 3922 988 43318 en Calculating the PCF of a System with respect to cable length