Your Cables Are Lying to You. PortScope Fixes That.
If you’ve ever worked with modern USB-C or Thunderbolt, especially on set or in production environments, you’ve hit this frustration: a cable looks identical to five others, your drive feels painfully slow, and macOS just tells you something is "Connected".
The core issue is that three completely different numbers get quoted as if they are the same thing:
- What the cable claims (its e-marker rating).
- What the link negotiated (the rate the two devices trained at).
- What your Mac actually measures (the real throughput you get right now).
A cable can claim 40 Gbps, negotiate at 10 Gbps, and deliver 3 Gbps because it's sitting behind a slow hub port. PortScope keeps those three numbers separate and tells you exactly which one is holding you back.
Clean, Human-Readable Information at a Glance
Instead of digging through System Information or decrypting raw terminal output, PortScope organizes your Mac's ports and topology into a clean, stable layout that doesn’t reshuffle every time you plug something in.
- Compact Dock Topology: Instead of drowning you in an 11-node tree of hub chips and billboard nodes, PortScope folds complex docks into a single, clean dock row.
- Power, Four Ways: See the adapter’s rating, the cable’s e-marker ceiling, the negotiated Power Delivery contract, and the live draw—without conflating them.
- Single-Sentence Bottleneck Verdict: Built right into the app is a "Why is this slow?" diagnosis that ranks potential causes and names the exact binding constraint.
- Menubar: View connected devices, their connection speed and data rates
- Displays: See bandwidth, name, resolution, arrangement of displays connected via USB-C, HDMI or through docks.
Memory-to-Memory Cable Testing: Is It the Cable or the Drive?
Testing a high-speed cable using an external SSD is inherently flawed—you end up testing the drive's controller, enclosure, or filesystem instead of the cable itself.
PortScope introduces a Two-Mac Cable Tester. By streaming data directly memory-to-memory between two Macs over the cable under test, the SSD and filesystem are removed from the equation entirely. On a Thunderbolt or USB4 connection, the cable itself becomes the only variable.
Perfect for Long Active Tether Cables
This is particularly crucial when validating long-run active tether cables on set—like the LVNA Rincon 10m cable. Long active cables rely on internal re-timer and re-driver chips to carry 10Gbps signal over 30+ feet. Point PortScope at a long tether run between two machines, flex the cable along its length, and use the Wiggle Test to sample link-error counters at 5 Hz. You'll see instant, real-time feedback if a connector or internal chip drops packets under full load.
The Perfect Pair: PortScope + Hardware Continuity Testers
It’s important to note what software can and cannot do. PortScope verifies identity, negotiated link speeds, and live throughput over active macOS APIs. It does not fully replace a physical hardware pin/continuity tester.
PortScope is designed to work in conjunction with a dedicated hardware tester like the CaberQU BLE:
- The Hardware Continuity Tester (CaberQU BLE): Checks physical wiring, broken CC/GND/VBUS pins, short circuits, and passive continuity when a cable is completely unplugged from a computer.
- PortScope: Takes things a step further in diagnosing troublesome cables. It reads the internal e-marker chip, verifies active re-timer/re-driver communication, tests real sustained memory-to-memory data throughput under load, and monitors live port-level error counters across sessions.
Together, they give you total coverage: hardware pin-level integrity on the bench, and real-world protocol and data integrity on your Mac.
Benchmark Beyond the Burst: A Disk Speed Test That Explains Why
Most traditional disk tools give you a short burst write/read number and call it a day. That hides what actually happens during sustained transfers on real shoots or large backups. They offer almost nothing in terms of diagnostics or simulating real-world usage.
PortScope’s Disk Speed Test measures true sustained performance while analyzing the underlying physics of your drive while simulating real-world workflows:
- SLC Cache Cliff Detection: Consumer SSDs write rapidly into a fast pseudo-SLC cache before dropping to native TLC/QLC speeds. PortScope detects that fold-over, plotting roughly how large your fast cache is and how fast the drive runs once it's full.
- Real-Time Thermal Telemetry: Drive speed and live temperature are plotted together on the same graph.
- Thermal Throttling vs. Cache Cliff: Crucially, PortScope distinguishes between a drive slowing down because the write cache filled up versus a controller thermal-throttling from heat—two slowdowns that look identical on standard benchmarks.
Try PortScope Today
All inspection, cable identity decoding, link monitoring, dock breakdown, and diagnostic reporting features in PortScope are 100% free.
If you want access to the active verification suite which includes the Disk Speed Test, Two-Mac Cable Tester, Wiggle Test, and Cable Health tracking over time you can unlock a lifetime 1.x license for up to two Macs.
- Requirements: Apple Silicon Mac (M1 or newer) running macOS 15 Sequoia or later.
Download PortScope or learn more at software.fainimade.com
