ADTRAN DE-4E Installation And Maintenance Manual

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ADTRAN DE-4E Installation And Maintenance Manual Manual pdf 13 page image

13Section 61245207L2-5, Issue 261245207L2-5C6. DSL DEPLOYMENT GUIDELINESThe ADTRAN FT1 DSL system is designed toprovide Fractional DS1 based services over loopsdesigned to comply with Carrier Service Area (CSA)guidelines. CSA deployment guidelines are givenbelow.1. All loops are non-loaded only.2. For loops with 26-AWG cable, the maximum looplength including bridged tap lengths is 9 kft.3. For loops with 24-AWG cable, the maximum looplength 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 containing26-AWG cable must not exceed12 - {(3*L 26 )/9} - L BTAP (in kft)L 26 = Total length of 26-AWG cableexcluding bridged taps (in kft)L BTAP = Total length of all bridged taps(in kft)This deployment criteria is summarized in the chartshown in Figure 14.Recommended maximum local loop loss informationfor PIC cable at 70°F, 135Ω resistive termination, isprovided in Table 6.An approximation for the maximum amount ofwideband noise on a DSL local loop as measured by a50 kbps filter is ≤ 31 dBrn.An approximation for the maximum level of impulsenoise as measured using a 50 kbps filter on a DSLloop is ≤ 50 dBrn.NOTEThese approximations are to be used asguidelines only and may vary slightly ondifferent loops. Adhering to the guidelinesshould produce performance in excess of 10-7BER.Figure 14. DSL Deployment Guidelines012111098765432101 2 3 4WORKING LENGTH OF 26 GAUGE CABLE (KFT)WORKING LENGTH OF 24 GAUGE (OR COARSER) CABLE (KFT)5 6 7 8 92.5 2.0 1.5 1.0 0.5 0.0TOTALBRIDGEDTAPLENGTH(KFT)INVALID DSL CABLE LENGTHSVALID DSL CABLE LENGTHSTable 6. Loop Insertion Loss DataFrequency (Hz) Maximum Loss (dB)3000 .................................... 12.010,000 .................................... 15.050,000 .................................... 25.5100,000 .................................... 30.0150,000 .................................... 32.75200,000 .................................... 35.25