User's manual g. Shdsl termination Unit Scorpio 1400 lcd

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2.2SHDSL Interface

  • Meet ITU-T G.991.2 Annex A relative requirements

  • Frame structure comply with section 7.1.1 of ITU-T G.991.2

  • Supports fixed mode operation for symmetric multiple data rates according to different network side /customer side interfaces. The data rate does not include 8 Kbit/s framing overheads.

  • Support Wetting Current function for feeding of a low current(between 1.0 mA and 20 mA)on the pair to mitigate the effect of corrosion of contacts.

  • Support power back off, comply with table 6-2 of ITU-T G.991.2.

  • Data rate of 64K to 2.304M bps (2 wires) or 64k to 4.624M bps (4 wires), (incrementing step: 64K bps).

  • Modulation Method: 16-TCPAM (16 levels Trellis Coded Pulse Amplitude Modulation).

  • The symmetric PSD for data rate of 256, 512, 768, 1536, 2048 and 2304 Kbit/s comply with the PSD masks defined in Annex A of ITU-T G.991.2.

  • Symbol Rate: (Data rate+8000)/3 symbol/sec

  • Load Impedance: 135 ohms ±5%.

  • Physical Connection Type: Standard RJ-45 jack, 135 ohm balanced via 2 wires or 4 wires twisted pair.

  • Port enabled / disabled configurable.

  • Network Side Interface.

2.2.1DS1 Interface

  • Bit Rate: 1,544 Kbit / s  32 ppm.

  • Frame Format: SF (D4), ESF, or ESF+CRC, field selectable.

  • Line Code: AMI or B8ZS, field selectable.

  • Impedance: Normal 100 ohms  5% resistive, symmetrical pair.

  • Power Level: For an all-one transmitted signal, the power in a 3 kHz band centered at 772 kHz is between 12.6 and 17.9 dBm. The power in a 3 KHz band centered at 1544 kHz is at least 29 dB below that at 772 kHz.

  • Jitter performance: Meet ITU-T G.824 requirements.

  • The DS1 network side interface of STU-C provide the function for the cable length (from 0 to 200 meters) compensation

  • Physical Connection Type: Standard RJ-48C / RJ45 jack.

2.2.2E1 Interface

  • Comply with G.703 Standard.

  • Bit Rate: 2,048 Kbit / s  50 ppm.

  • Frame Format: Unstructured or Structured framing, field selectable

  • Line Code: High Density Bipolar of Order 3 (HDB3).

  • Impedance: Normal 120 ohms  5% resistive, symmetrical pair.

  • Jitter performance: Meet ITU-T G.823 requirements.

  • Normal Peak Voltage of a Mark (pulse): 3 V for 120 ohms. Peak Voltage of a Space (no pulse): 0 ± 0.3 V for 120 ohms.

  • Normal Pulse Width: 244 ns.

  • Ratio of the Amplitudes of Positive and Negative Pulse at the Center of Pulse Interval: 0.95 to 1.05.

  • Ratio of the Widths of Positive and Negative Pulse at the Normal Half Amplitude: 0.95 to 1.05.

  • Line Interface: 120 ohm (RJ-45 / RJ48C) balanced, 75 ohm (BNC).

  • Physical Connection Type: Standard RJ-48C/RJ-45 jack (Balance) or BNC (Unbalance).

  • Signal of input port was defined as above and can be modified by the characteristics of the interconnecting pair. The insertion loss of this pair at a frequency of 1024 kHz is in the range of 0 to 6 dB.

  • Minimum Return Loss at the Input Port: 12 dB for 51 to 102 kHz, 18 dB for 102 to 2,048 kHz 14 dB for 2,048 to 3,072 kHz

2.2.3V.35 Interface

  • Electrical Characteristics: Comply with ITU-T V.35 interface.

  • Software configurable for V.35, X.21, RS530, V.36/RS-449.

  • Data Rate: n x 64 Kbit/ s, where n = 1~36(2 wires) or n=2~ 72(4 wires). The data rate does not include 8 Kbit/s framing overheads.

  • Data inversion selectable.

  • Clock inversion selectable (internal/ DTE/ line/ DTE-hybrid).

  • Physical Connection Type: The pin assignment of ITU-T V.35 interface comply with 34-pin ISO 2593 connector.

2.2.4Ethernet Interface (S1400RL)

  • Provide a 10/100 Base-T half/full duplex auto sensing of Ethernet Interface.

  • Comply with the IEEE 802.3/ IEEE 802.3u.

  • Physical Connection Type: Standard RJ-45 connector.

  • Operate as a self-learning bridge specified in the IEEE 802.1d full protocol transparent bridging function

  • Supporting up to 128 MAC learning addresses.

  • Supporting Bridge filter function based on source MAC addresses

2.3Timing and Synchronization

Table 2-1 shows three modes to be field selectable.

Table 2 1 Timing and Synchronization

Mode Number

STU C Symbol Clock Reference

STU R Symbol Clock Reference

Example Application



Local oscillator (internal timing)

Received symbol clock

"Classic" HDSL



Transmit data clock(DTE timing)

Received symbol clock

Main application is synchronous transport in both directions.



Hybrid Transmit data clock (Hybrid DTE timing)

Received symbol clock

Synchronous downstream transport and bit-stuffed upstream is possible.


downstream is synchronous and

upstream is plesiochronous

  • Provide a 10/100 Base-T half/full duplex auto sensing Ethernet Interface.

  • At all rates, the transmit symbol clock during data mode from any SHDSL device is accurate to within ±32 ppm of the normal frequency.

  • When the STU-C receiver loses Transmit data clock, it will fall back and use a free-running local oscillator in the STU-C,the STU-C local oscillator will have the accuracy of ±32 ppm.

  • The SHDSL transceivers will operate in a master-slave mode with STU-R (Slave) synchronized to the received signal from the STU-C (Master) (i.e. Received symbol clock).

  • If the STU-R receiver loses timing, it will fall back and use a free-running local oscillator in the STU-R,the STU-R local oscillator will have the accuracy of ±32 ppm.

  • The SHDSL system is an equipment of frequency transparency. The average traced frequency deviation at the DS1/E1 output port is less than ±1 x 10-11 to the frequency at the DS1/E1 input port under Mode 2 clocking architecture.
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