DIGITUS DS-55123 4K HDMI Extender via CAT/IP User Manual

DIGITUS DS-55123 4K HDMI Extender via CAT or IP

DS-55123 Rev. 2



This is a HDMI receiver unit for the Digitus® HDMI over IP Extender (DS-55122). It also fits to them Digitus® 4K HDMI Extender Splitter, 1×8 (DS-55304) also. The Extender (DS-55122) extends the HDMI signal up to 120 meters via Cat 6 network cable, supports 4K2K/30Hz resolution, with IR pass back function.


Important safety notice

Please read below safety instructions carefully before installation and operation:

  1. Please pay attention to all the warnings and hints on this device.
  2. Do not expose this unit to rain, moisture and liquid.
  3. Do not put any stuff into the device.
  4. Do not repair or open this device without professional people’s guidance.
  5. Make sure good ventilation openings to avoid product overheating damage.
  6. Shut off power and make sure environment is safe before installation.
  7. Do not plug-in/out the network cables and IR cables when it is in using to avoid cables damage.
  8. Use DC5V only. Make sure the specification matched if using 3rd party DC adapters.


Package Contents

FIG 1 Package Contents



FIG 2 Specification

FIG 3 Specification


Installation Requirements

  1. HDMI source device
  2. HDMI display device with HDMI port.
  3. Network cables: CAT 5/5E/6 network cables
  4. Transmission length: CAT 5 – 80m/CAT 5E – 100m/CAT 6 – 120m


Panel Description

1. HDMI EXTENDER RX (Receiver)

FIG 4 Panel Description

  1.  HDMI signal output
  2. IR signal input to connect with IR receiver extension cable
  3.  Reset
  4. Power Light
  5. Power input (DC5V)
  6. Data transmission light
  7. Network link light
  8. HDbitT signal input



2. Connections

2.1. Point to Point connection:

Up to 120 meters transmission distance over single CAT6 (High quality cable can reach up to 150 meters).

FIG 5 Connections

2.2. Network Switch/Router Connection:

By using network switch/router/repeater, realize unlimited extension.

FIG 6 Network Switch Or Router Connection

2.3. One-to-many Connection:

By using network switch/router, one ender to several receivers (up to 253 receiver units)

FIG 7 One-to-many Connection

2.4. 1×8 Extender Splitter Connection (only for DS-55304)

FIG 8 1x8 Extender Splitter Connection


Q: TV display “Waiting for connection” on the right corner?
A: Please check if the power supply of TX (Sender) and switcher (if used) is connected, and make sure connecting cable is firmly.

Q: TV display “Please check the TX input signal”?
A: 1) Please check if there is a HDMI signal input of TX.
2) Try to connect the signal source directly to display device to see if there is signal output from source device or change the signal source, HDMI wire and try again.

Q: When playing 4Kx2K source, screen is back without any content?
A: Make sure both TV and HDMI cable support HDMI 1.4

Q: Display not fluent, not stable?
A: 1) Please check the cable length between the TX to switch, the switch to the RX and the connection between each level is within the required range.
2) Click the “reset” button on the TX/RX front panel, reset and reconnect.

This is a Class A product. In home environment, this product may cause radio interference. In this case, the user may be required to take appropriate measures.

Hereby Assmann Electronic GmbH, declares that the Declaration of Conformity is part of the shipping content. If the Declaration of Conformity is missing, you can request it by post under the below mentioned manufacturer address.

Assmann Electronic GmbH
Auf dem Schüffel 3
58513 Lüdenscheid


Product Compliance


Read More About This Manual & Download PDF:

Documents / Resources

DIGITUS DS-55123 4K HDMI Extender via CAT/IP [pdf] User Manual
DS-55123 4K HDMI Extender via CAT, DS-55123 4K HDMI Extender via IP, 4K HDMI Extender via IP, 4K HDMI Extender via CAT, 4K HDMI Extender, HDMI Extender, Extender


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