2 pair telephone cable

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Category 3 cable, commonly known as Cat 3 or station wire, is an unshielded twisted pair (UTP) cable designed to reliably carry data up to 10 Mbit/s, with a possible bandwidth of 16 MHz. It is part of a family of copper cabling standards defined jointly by the Electronic Industries Alliance and the Telecommunications Industry Association.

Electrical  Characteristics
NO.	Item   100Pairs x 0.50mm Bare Copper	Unit	Value
1	Conducter DC Resistance  +20ºC	Ω/km	Conductor diameter,mm				0.5
			Maximum				95
2	DC Resistance Unbalance  +20ºC	%	Average  ≤				1.5
			Maximum				5
3	Insulation  resistance    +20ºC  DC100-500V	MΩ·km	Minimum     10×10 3
4	Dielectric Strength   DC	KV
	Applied voltage time		3s			1min
	Conductor to Conductor		2			1
	Conductor to Screen		6			3

Attenuation     +20ºC		dB/km	Conductor diameter,mm			0.5
≥25Pairs cable:150kHz			Average  ≤			9
1024kHz			Average  ≤			22.5
8	Near End Crosstalk1024kHz	150KHz	dB	≥52
	Length  ≥0.3km	300KHz		≥48
		1000KHz		≥40
9	ELFEXT at 1km	150KHz	dB	≥58
		300KHz		≥52
		1000KHz		≥42
10	PSNEXT	150KHz	dB	≥49
		300KHz		≥45
		1000KHz		≥37
11	PSELFEXT at 1km	150KHz	dB	≥54
		300KHz		≥48
		1000KHz		≥38

2 pair telephone cable