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Modem QLink-3000/C-U

Discontinued, recommended replacement is: QLink-3000/M

Typical transmittion range on 26 AWG (0.4 mm) cable

Modem QLink-3000

Cables V.35 (M34(f) - DB25(m))
Cables V.35 (M34(f) - DB25(m))

  • Up to 10 km over single copper pair
  • Data rates from 64 to 5696 kpbs
  • Line code TC-PAM16, TC-PAM32
  • Line protection
  • ITU-T G.991.2(2004) Annex A,B,F,G
  • Three data ports: E1 (G.703), Ethernet 10/100BaseT, V.35(RS-530/X.21)
  • Five working configuration: E1, V.35, Ethernet, E1+V.35 and E1+Ethernet
  • Local management interface with LCD display
  • Console RS-232 port
  • Local and remote loopbacks
  • Integrated BER tester
  • AC or DC power
  • Certificate N OS/1-TM-317 of Russian Ministry of Communications

The QLink-3000/C-U family of short range modems provides high-speed data access over single-pair copper wires. It can transmit data with rates up to 5696 kbps for up to 10 km (at diameter of wire 0.6 mm).
The QLink-3000/C-U modem can be AC or DC powered. The device setup and all diagnostics options are configured via LCD panel or via RS-232 port or from remote device.


Line Interface SHDSL
Line Copper twisted pair
Line Code TC-PAM16, TC-PAM32
Line Rate 192 - 5696 kbps (N*64 kbps, N=3...89)
Transmit Timing Sources Internal Oscillator, from E1 port receiver, from Data Port
Loop Length 2.4km - 6.4km (0.4mm)
Connector Type RJ-45 (female 8 contacts)
Overvoltage Protection SIDACtor
Overcurrent Protection Fuse
E1 interface
Interface According to ITU-T G.703
Line Code HDB3 or AMI
Line Impedance 120 Ohm (Twisted Pairs) или 75 Ohm
Receive Signal Attenuation Range from 0 to 43 dB (up to 2.0 km of 22 AWG twisted-pair cable)
Frame Structure per G.704 or transparent G.703 2048 kbps stream
Overvoltage Protection TVS
Overcurrent Protection Fuse
Connector Type RJ-45 (female 8 contacts)
Ethernet interface
Interface Ethernet 10/100Base-T
Data rate 64 - 5696 kbps (N*64 kbps, N=1...89)
Mode 100 Mbps Full-duplex,
100 Mbps Half-duplex,
10 Mbps Full-duplex,
10 Mbps Half-duplex или
Protocols Remote bridge
Address table size 1024
Maximum packet size 1518 bytes, including MAC header
Connector Type RJ-45 (female 8 contacts)
V.35/RS-530/X.21 interface
Interface V.35, RS-530 or X.21, cable include V.35 (M34(f) - DB25(m))
Data rate 64 - 5696 kbps (N*64 kbps, N=1...89)
Mode Synchronous, DCE
Clock Signals Supported TXC, RXC, ETC
Modem Control Signals DTR,DSR,RTS,CTS,CD
Connector Type DB25 (female)
Control interface
Connector Type RS-232 DCE, RJ-45 (female)
Protocol Asynchronous, 115200 bit/sec, 8 bit/symbol, 1 stop bit, no parity
Modem Control Signals no used
Diagnoctic modes
Loopbacks (exclude Ethernet) Digital, Local Data, Local Line, Remote Line, Remote Data
BER Tester Built-in
Control LCD panel, RS-232 port or from remote device
Box Desktop
Dimensions 198 mm x 168 mm x 46 mm
Weight 850 g
Power source
AC power source 90-240 V, 50-60 Hz
DC power source 36-72 V
Power 12.5 VA Max
Temperature 0° to +50°С
Humidity 0 to 80 %, non-condensing

Typical transmittion range on 26 AWG (0.4 mm) cable

N timeslots 3 8 16 24 32 60 89
Payload Rate (kbps) 192 512 1024 1536 2048 3840 5696
Reach 26 AWG (0.4 mm), km 6.4 5.2 4.3 4.0 3.5 2.7 2.4


Some of the documents are in Adobe® Acrobat® Reader® format

PDF  Qlink-3000/C-U. User's Manual in English

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