Best Modem Cables of 2026

"I noticed a clear improvement in audio quality after using this cable with my vintage phone. It's practical and sturdy, and I highly recommend it to anyone looking for a reliable connection."

"After my dog chewed through my adjustable bed's sync cable, I struggled to find a replacement that worked. This cable was the only one that fit perfectly and restored my bed's functionality—I'm extremely satisfied with the result."

"We integrated this cable into our cash drawer setup, and it has been flawless for data transfer. The durable flat design makes it easy to manage in tight spaces, and the snug connectors give us confidence in daily use. It's kept our POS system running smoothly."

"I found this cable to be well made and perfectly functional for my needs. It's a true null modem RS-232 cable, and it worked flawlessly for router management. I appreciated the good quality and reliable performance."

"When I needed a female-to-female RS232 null cable for some older test equipment, this was exactly what I was looking for. The build is solid and the connections are stable as long as you don't move them much. Using it with NI-Max, I was able to successfully communicate with my oscilloscope and run automated tests. Overall, it just works and feels dependable."

"This cable integrated smoothly with my setup involving USB-to-serial adapters and a DB9 breakout for testing PPP connections between Linux systems. I even pushed it to speeds well above 115.2k without any errors during large file transfers. Flexible and reliable, it’s a great tool for serial console work."

"I hooked up two charge controllers and they’re now communicating seamlessly, so I’m confident it’s doing the job."

"After switching from a generic RJ45 to this cable, my connection issue between the inverter and Cerbo was completely resolved. Arrived in official packaging—no complaints."

"This cable is classic Victron quality and lets me parallel my two Multiplus inverters perfectly."

"I needed a cable to connect my old computer to a vintage CNC machine, both with COM ports requiring a null modem crossover. This cable was exactly what I needed—no more bulky adapters, and it functions perfectly as a true null RS232 cable. It really simplified my setup and worked flawlessly!"

"When my critical legacy device needed a connection, I ordered this cable and it arrived quickly. It was a lifesaver—worked right out of the box and saved me a ton of hassle. Highly recommended for anyone dealing with older tech."

"As someone working with 30- to 40-year-old equipment sporting RS232 ports, I appreciate this cable for its solid build and authentic retro aesthetic. It eliminated my messy workaround and made connecting devices much easier. The null modem feature and rolled send/receive lines were exactly what I needed."

"I needed to move my AT&T U-Verse DSL router about 50 feet from the wall jack to a central location. With this cable, my speeds actually increased compared to the original cord, and I experienced zero issues with interference—even when running alongside other electrical cables. The shielding and build are top-notch, and all my devices connected flawlessly. I highly recommend this product."

"After replacing a decades-old unshielded cable with this one, I noticed a clear improvement in DSL speed and a big reduction in line noise. I love being able to see the shielding through the transparent insulation, and the metal connectors feel exceptionally sturdy. The cord is a bit stiff, but that just adds to my confidence in its durability."

"I had to relocate my modem to a spot about 40 feet from the jack, and this cable did the trick—no connection drops or speed loss. The robust foil shielding blocks out interference perfectly, providing a clean signal for my DSL. It's a must-have for anyone needing a longer, reliable connection."

"I needed a longer cable for an older device and also bought some adapters. Everything worked flawlessly, which made the process incredibly smooth."

"I used this cable with Norton Commander for DOS to back up data from a vintage PC that lacked a working disk drive. It performed perfectly and saved the day!"

"My project involved connecting an old Wyse Winterm to my modern PC through some creative means, including using this cable for a serial connection. It worked exactly as needed for my elaborate setup!"

"I picked up this cable for an urgent project and got it overnight. Great build, excellent price, and it worked exactly as I needed. Really can't ask for more."

"I've used Startech cables for years and always trust the brand. The gold-plated connectors, thick durable cable, and stable performance stand out. I really appreciate how quickly it arrived—ordered at night, delivered by noon."

"It is a cable and yes, it works. Just a heads-up: it doesn't supply power, so if that's your need, this isn't the right fit. For regular data tasks, though, it does the job."

"I replaced a lower quality cable with this one from StarTech, and I'm impressed by its sturdy construction and excellent strain relief. The long plastic screw knobs make connections easier, and overall, it's a reliable cable that performs exactly as expected."

"The cable arrived quickly and matched the product description perfectly—from its build quality to its accurate length. I appreciate the convenient zip-top bag for storage when I'm not using it."

"These are affordable null modem cables that are indispensable for older equipment. My only minor issue is that they don't have clear markings, so I had to label them myself."

"I needed a cable for the serial port on my Synology DS2419+ due to boot issues, and after trying this one, it worked perfectly. I just set the terminal to 115200 baud and was able to access the system without a hitch."

"I bought this cable specifically to work with a Cienna 311 interface, and it delivered exactly as expected. No issues at all with compatibility or performance."

"I chose these cables because they were advertised as having only TX/RX and ground connected—‘3-wire type’. However, I discovered that several other pins are wired straight through, contrary to what's stated. If you need a cable with only three connections as described, this might not be the best fit. The packaging also mentions something irrelevant about wire colors in molded cables."