We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Black RJ11 6P4C male to USB female adapter cable 30cm

PLEASANTLY SY0046 RJ11 6P4C Male to USB Female Adapter 30cm

SKU CH-T1MJ-A3W1A

Connects an RJ11 6P4C phone jack to a USB-A port for modem, fax or line testing

  • Adapter typeUSB A to B
  • Cable length4.72 in (12 cm)
  • Connector typeUSB
  • Product typeUSB
  • Product colorBlack
  • DetailsUSB, PC, Modem, 0.889 L x 8.7884 W x 11.6078 H centimeters,
  • Converts RJ11 6P4C male to USB A female for telephone interface testing
  • Plug-and-play connection requires no extra drivers or software installation
  • Flexible 30 cm cable resists breakage for reliable daily use
  • Links phones, fax machines or modems to a computer USB port
  • Compact adapter measures 4.72 inches long for easy portability

RJ11 6P4C to USB A adapter for phone and modem links

This cable converts an RJ11 6P4C male plug into a USB A female port so telephone lines can be used with PC software or test equipment. It suits technicians checking modem handshakes, fax machines that need a USB link, or legacy phone gear attached to modern laptops. The 30 cm length keeps the connection tidy on a bench or desk. Plug-and-play operation means no driver installation is required.

Signal integrity on extended calls and fax sessions

The adapter maintains a stable electrical path for voice-grade and low-speed data signals over the full 30 cm run. Copper contacts resist oxidation, and the moulded strain relief prevents intermittent faults when the cable is moved during long fax transmissions or modem diagnostics. No active circuitry is present, so latency and signal level are determined entirely by the attached devices and line quality.

Verify your device uses a standard RJ11 6P4C jack

Ensure the telephone, fax or modem you plan to connect presents a six-position four-contact RJ11 socket wired for the signals your software expects. The adapter provides only a physical gender change; it does not supply power, convert protocols or emulate a serial port. Devices that require proprietary pin-outs, external power or active conversion will not work with this passive cable.

How it compares

Measured against everything we stock in Network Adapters & RJ45 Plugs, at today’s prices. Recalculated every night.

Price $20.99
Typical for this category: the median of 1,221 items is $19.99.

New to this? Which coin should you pay with — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand namePLEASANTLY
Part numberSY0046
Product typeUSB
Adapter typeUSB A to B
Product colorBlack
Ports & slots
Connector typeUSB
Size & build
Cable length4.72 in (12 cm)
Product dimensions0.889 cm × 8.7884 cm × 11.6078 cm
In the box
In the box1 x USB

Questions about this item

Does the 30 cm cable length add any noticeable resistance or heat when the adapter is used continuously?

The adapter is a passive cable with no active electronics, so it draws no power and generates no heat regardless of how long it stays connected.

What equipment must I already have to use the RJ11 6P4C male to USB A female adapter?

You need a device with an RJ11 6P4C port — such as a telephone, fax machine or modem — and a standard USB A cable to plug into the female socket.

Will this adapter work with an older modem that only has an RJ11 6P4C jack?

Yes, the RJ11 6P4C male plug fits directly into the legacy modem jack, letting you connect a USB cable for data or testing.

More in Network Adapters & RJ45 Plugs

Similar items