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Modem-multiplexer QLink-3000/S

Typical transmittion range on 26 AWG (0.4 mm) cable

Modem-multiplexer QLink-3000 Features:
  • Up to 10 km over single copper pair
  • Line data rates from 208 to 2320 kbit/sec
  • Data rates from 64 to 2304 kbit/sec
  • Line code TC-PAM
  • Line protection
  • Two data ports (one is always E1, another - E1 or Ethernet 10/100BaseT)
  • Local and remote loopbacks
  • Integrated BER tester
  • Console RS-232 port
  • SNMP Ethernet control port
  • Dry contacts alarm interface
  • Rack-mount 1U
  • AC or DC power
  • Declaration of compliance D-MDPD-7909

The QLink-3000 family of short range modems provides high-speed data access over single-pair copper wires. It can transmit data with rates up to 2304 kbps (without a repeater) for up to 7.6 km (on 26 AWG cable). Using lower guage copper wire may allow you to attain greater distances. Models with two data ports includes multiplexer and allows to transmit two independent data streams over single cooper pair:

Block diagram

The Qlink-3000 multiplexer can be AC or DC powered.

The device setup and all diagnostics options are controlled from the special supervisory port (asynchronous RS-232, 9600, 8N1) or through Ethernet port (SNMP protocol).

The device has an upgradeable firmware.

Currently available models are listed in Prices. Please, contact technical support if you are unsure which model to choose.


Line Interface
Line Copper twisted pair
Line Rate 208 - 2320 kbps
Loop Length Up to 7.6 km over 26 AWG copper wire
Connector Type RJ-45 (female 8 contacts)
Line Code TC-PAM
Transmit Timing Sources Internal Oscillator
From port (from E1 port receiver)
Overvoltage Protection SIDACtor
Overcurrent Protection Fuse
E1 interface
Connector Type RJ-45 (female 8 contacts)
Line Impedance 120 Ohm (Twisted Pairs)
Line Code HDB3
Frame Structure per G.704 or transparent G.703 2048 kbps stream
Receive Signal Attenuation Range from 0 to 43 dB (up to 2.0 km of 22 AWG twisted-pair cable)
Overvoltage Protection TVS
Overcurrent Protection Fuse
Interface Ethernet
Interface 100Base-T
Connector Type RJ-45 (female)
Data rate 64 - 2304 kbit/sec
Mode 100 Mbps Full-duplex,
100 Mbps Half-duplex,
10 Mbps Full-duplex,
10 Mbps Half-duplex,
or Autonegotiation
Address table size 15000 MAC addresses
Maximum packet size 1600 bytes, including MAC header
Protocols Transparent or Cisco-HDLC bridging IEEE protocol, automatically selected
Quality of Service 8 priority levels
Alarm Interface
Connector Type 9 pin DB9 female
Relay Contact Current Up to 600 mA
Relay Contact Voltage Up to 110 VDC / 125 VAC
Control interface
Connector Type RS-232 DCE, DB-9 (female)
Protocol Asynchronous, 9600 bit/sec, 8 bit/symbol, 1 stop bit, no parity
Modem Control Signals DTR, DSR, CTS, RTS, CD
Diagnoctic modes
Loopbacks Local, Remote
BER Tester Built-in
Control Via control port RS-232 or from remote unit
Box Rack mount 19" 1U
Dimensions 444 mm x 262 mm x 44 mm
Weight 3400 g
Power source
AC power source 176-264 V, 50 Hz
DC power source 36-72 V
Power 12.5 VA Max
Temperature 0° - 50°ะก
Humidity 0 to 80 %, non-condensing

Typical transmittion range on 26 AWG (0.4 mm) cable

Line Rate 272 kbps 784 kbps 2320 kbps
Payload Rate 256 kbps 768 kbps 2304 kbps
Reach 26 AWG 7.6 km 5.4 km 4.0 km


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

PDF  User's Manual for models Qlink-3000/S-2E1-SNMP and Qlink-3000/S-E1-ETV-SNMP in Russian
PDF  User's Manual for models Qlink-3000/S-2E1-SNMP and Qlink-3000/S-E1-ETV-SNMP in English
MIB  MIB-files for SNMP-management

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