ADTRAN DE-4E specifications DSL Deployment Guidelines, Loop Insertion Loss Data

6. DSL DEPLOYMENT GUIDELINES

The ADTRAN FT1 DSL system is designed to provide Fractional DS1 based services over loops designed to comply with Carrier Service Area (CSA) guidelines. CSA deployment guidelines are given below.

1.All loops are non-loaded only.

2.For loops with 26-AWG cable, the maximum loop length including bridged tap lengths is 9 kft.

3.For loops with 24-AWG cable, the maximum loop length including bridged tap lengths is 12 kft.

4.Any single bridged tap is limited to 2 kft.

5.Total bridged tap length is limited to 2.5 kft.

6.The total length of multi-gauge cable containing 26-AWG cable must not exceed

12 - {(3*L26)/9} - LBTAP (in kft)

L26	=	Total length of 26-AWG cable
		excluding bridged taps (in kft)
LBTAP	=	Total length of all bridged taps
		(in kft)

This deployment criteria is summarized in the chart shown in Figure 14.

	12
(KFT)	11			INVALID DSL CABLE LENGTHS
	10
CABLE
	9					TOTAL
						BRIDGED
COARSER)
					2.5
							TAP
	8				2.0
						1.5		LENGTH
						1.0	0.5	(KFT)
	7							0.0
(OR
GAUGE	6
	5
OF 24
	4
LENGTH
	3
WORKING	2
	1	VALID DSL CABLE LENGTHS
	0
	0	1	2	3	4	5	6	7	8	9
		WORKING LENGTH OF 26 GAUGE CABLE (KFT)

Figure 14. DSL Deployment Guidelines

Recommended maximum local loop loss information for PIC cable at 70° F, 135Ω resistive termination, is provided in Table 6.

Table 6. Loop Insertion Loss Data

Frequency (Hz)	Maximum Loss (dB)
3000	12.0
10,000	15.0
50,000	25.5
100,000	30.0
150,000	32.75
200,000	35.25

An approximation for the maximum amount of wideband noise on a DSL local loop as measured by a 50 kbps filter is ≤ 31 dBrn.

An approximation for the maximum level of impulse noise as measured using a 50 kbps filter on a DSL loop is ≤ 50 dBrn.

NOTE

These approximations are to be used as guidelines only and may vary slightly on different loops. Adhering to the guidelines should produce performance in excess of 10-7BER.

61245207L2-5C Section 61245207L2-5, Issue 2 13