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Фрагмент инструкции
The signal may appear hotter than it should be. 2 Loopback timeout must be selected prior to initiating a loopback. 3 60 and 120 minutes is selectable from the craft interface. 61245.001L2-13A Section 61245001L2-13, Issue 1 ADTRAN PRACTICES 5th Gen HTU-C/HTU-R Quick Start guide HDSL DEPLOYMENT GUIDELINES The ADTRAN HDSL system is designed to provide 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 9kft. 3. For loops with 24-AWG cable, the maximum loop length including bridged tap lengths is 12kft. 4. Any single bridged tap is limited to 2kft. 5. Total bridged tap length is limited to 2.5kft. 6. The total lenght 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. Recommended maximum local loop loss information for PIC cable at 70°F, 135W, resistive termination is listed in the provided table. An approximation for maximum amount of wideband nosie on a DSL local loop as measured by a 50kbps filter is < 31dBrn. An approximation for maximum amount of impulse noise on a DSL local loop as measured by a 50kbps filter is<50dBrn. 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. WORKING LENGTH OF 24 GAUGE (OR COARSER) CABLE (KFT) 12 11 10 9 8 7 6 5 4 3 2 1 0 2.5 INVALID HDSL CABLE LENGTHS 2.0 1.5 1.0 0.5 0.0 TOTAL BRIDGED TAP LENGTH (KFT) VALID HDSL CABLE LENGTHS 0123456789 WORKING LENGTH OF 26 GAUGE CABLE (KFT) When deployment requires the use of two HREs, the HTU-C M can be deployed with two Low Voltage T400 HREs (1244.041L2) and one Low Voltage HTU-R (1245.021L1 or 1245.026L1). Loop Insertion Loss Frequency (Hz) Maximum Loss (dB) 3000 10,000 50,000 100,000 150,000 200,000 12.0 15.0 25.5 30.0 32.75 35.25 ADTRAN Technical Support (800) 726-8663 Standard support hours, Monday-Friday, 7am-7pm CST Emergency Support 7 days/week, 24 hours/day Section 61245001L2-13, Issue 1 61245.001L2-13A ...
Эта инструкция также подходит к моделям:Сетевое оборудование - HTU-C M (25.28 kb)