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Products -
DLC
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The HS-D-20
The HS-D-20 is based on G.SHDSL technology. It converts analog signals from four customer circuits simultaneously to digital，then transmits the broad band digital signal composed by 64K digital signals within a single twisted pair. With 10 EU's in a Subrack, the system can access 200 customers.
One connector of EU is connected with Exchange terminals, while the other connects with the LINK & PF of system via the backplane. When customers are communicating, it achieves function of A/D converter, code/decode, and muldex/concentrator, and feeds power to RU by the DSL Link .
The RU is fixed and sealed in a plastic housing. It joints the customer terminals. The RU works to achieve the transmission of signal of customers on Link, after A/D converter, code/decode, and muldex/concentrator.
Specification
| Operating Environment ： |
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EU:
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Temperature Range: +5 ° C ~ +50 ° C |
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Relative Humidity: 20% ~ 95% (No condensing) |
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RU:
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Temperature Range: -40 ° C ~ +60 ° C |
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| Operating Power： |
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EU:
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－ 42VDC～－65VDC supply by the Exchange |
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RU:
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±125VDC; supplied by the EU, Maximum current limited to less than 60mA |
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CUSTOMER TERMINAL:
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-48VDC supply by the RU |
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OMI:
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supplied by the EU |
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| Dimensions： |
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Subrack:
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19-inch rack, 355mm (8U) height, 255mm depth |
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RU:
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357×215×105mm |
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| Customer capability： |
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A unit can access up to 20 customers |
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A Subrack can hold up to 10 Exchange units |
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| Operational functions： |
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The EU provides automatic performance monitoring and alarm management |
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The EU can detect and display the fault on the power feed link |
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The OMI is used for local or remote maintenance |
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| Additional functions: |
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Supports caller identification |
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Support payphone interface: polarity reversal and 16/12 kHz. |
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A leg and B leg joint system in any order |
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| DSL Transmission Performance: |
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Line coding:
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TC-PAM |
| Transmission rate: |
272kbit/s |
| Safety: |
Meets ITU-T K.44 |
| Maximum Transmission Range： |
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EU to RU:
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48dB@40kHz |
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Approx ?0.4mm copper wire, 6km; ?0.5mm, 8km |
EU to
customer: |
1000 R loop resistance (not including telephone) |
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Last Updated on Friday, 12 December 2008 10:49 |
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