ADTRAN DE-4E Installation And Maintenance Manual

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ADTRAN DE-4E Installation And Maintenance Manual Manual pdf 18 page image

A-2 Section 61245207L2-5, Issue 3 61245207L2-5CThere is one loopback available to the FT1 Repeaters.The FT1 Repeater Network loopback is a digitalloopback toward the CO as shown in Figure A-4.The loopbacks are initiated by the DDS latchingloopback codes for NEI Position 1 (N1000001) forFT1 #1 or NEI Position 2 (N100001) for FT1Repeater # 2. The NEI latching loopback is detectedin the primary DS0 of the FT1 circuit, the channelwhere the FT1 DP is physically installed, to controlthe looping of the FT1 circuit. When the FT1 circuitis looped, all DS0s in use will be looped. The DS0s inuse will also be transmitted on to the customer.There are two loopbacks available to the FNID. TheFNID network loopback loops the FT1 signal backtoward the network. The FNID CPE loopback loopsthe FT1 signal back toward the customer.The FNID network loopback is a digital loopbacktoward the CO as illustrated in Figure A-5. Thisloopback is initiated by the DDS latching loopbackcode for NEI Position 1 (N1000001) for anon-repeatered loop, or NEI Position 2 (N1000001)for a single repeater loop or by NEI Position 3(N1000001) for a two repeater loop; by the craftinterface when available, or by the REM LBK buttonat the FT1 DP. The NEI Position 1 latching loopbackis detected in the primary DS0 of the FT1 circuit (thechannel in which the FT1 DP is physically installed),to control the looping of the FT1 circuit. When theFT1 circuit is looped, all DS0s in use will be looped.The DS0s in use will be filled with all 1s andtransmitted toward the customer.The FNID CPE loopback is a digital loopback towardcustomer premises as shown in Figure A-6. Thisloopback is initiated by the craft interface, whenavailable. When the FT1 circuit is looped, all DS0s inuse will be looped. The data in the DS0s in use willbe transmitted toward the network.Figure A-4. FT1 Repeater # 1 or 2 Network LoopbackDSX-1InterfaceCentral OfficeFT1 DPD4Channel BankFNIDHDSLLocal LoopDS1InterfaceCustomer PremisesFT1Repeater# 1 or 2Figure A-5. FNID Network LoopbackDSX-1InterfaceCentral OfficeFT1 DPD4Channel BankFNIDHDSLLocal LoopDS1InterfaceCustomer PremisesFigure A-6. FNID CPE LoopbackDSX-1InterfaceCentral OfficeFT1 DPD4Channel BankFT1-NIDHDSLLocal LoopDS1InterfaceCustomer Premises

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