HDBaseT sends uncompressed ultra-HD video, audio, Ethernet, control and up to 100 W of power down a single Category cable — and it terminates in an ordinary-looking 8P8C RJ45 jack (母座). But that jack is doing far more than a data port: it carries HDBaseT's downstream bandwidth of up to 16 Gbit/s and the DC of Power-over-HDBaseT. This guide explains what HDBaseT asks of the connector and how to choose the right shielded RJ45 socket — including when an integrated-magnetics jack (magjack) is the better call — with figures sourced from the HDBaseT Alliance, IEC 60603-7, ANSI/TIA-568 and IEEE 802.3, plus VOOHU's own jack range.
HDBaseT is a connectivity standard from the HDBaseT Alliance that carries its "5Play" feature set — uncompressed UHD video, audio, 100 Mbps Ethernet, control (USB / RS-232 / IR / CEC) and up to 100 W of power — over a single Category cable terminated with a standard 8P8C RJ45 connector, at distances up to 100 m (328 ft) on Cat5e or Cat6. The link supports up to 16 Gbit/s downstream and 2 Gbit/s upstream; HDBaseT 2.0 carries 4K@30 4:4:4 / 4K@60 4:2:0 out to 100 m over Cat6.
Because all of that rides the same eight contacts, the jack stops being "just a port" and becomes a signal-integrity and power component. The three things that separate an HDBaseT-grade socket from a commodity data jack are bandwidth headroom, PoH current handling, and shielding — and, in many designs, whether the isolation magnetics live inside the jack.
The table maps each HDBaseT system requirement to what it means for the RJ45 socket you specify. Standard references are named so you can see what governs each row.
| HDBaseT demand (sourced) | Why it matters | RJ45 jack requirement |
|---|---|---|
| Up to 16 Gbit/s downstream video over the pairs (HDBaseT Alliance) | Far beyond Gigabit; needs frequency headroom and a clean impedance match | Shielded jack built to Category 6A performance (ANSI/TIA-568), tight return loss and NEXT |
| Up to 100 m reach on Cat5e/Cat6 (HDBaseT Alliance) | The channel budget is tight at full reach | Low insertion loss, controlled 100 Ω differential impedance (IEC 60603-7 interface) |
| PoH up to 100 W across four pairs, based on IEEE 802.3at | DC power rides the same pairs as data | High per-port current rating (VOOHU 350 mA–1.5 A); magnetics that do not saturate under bias |
| 100 Mb Ethernet channel + galvanic isolation | Safety and EMC of the Ethernet path | Integrated or discrete magnetics; ≥1500 Vrms isolation per IEEE 802.3 — magjack option |
| Dense, noisy AV-rack EMI environment | Emissions and immunity at HDBaseT frequencies | Metal shielded housing with EMI tabs/gasket and proper chassis-ground return |
| Rack thermal load + repeated service | Reliability over the product life | Wide-temperature grade (−40 ~ +85 °C) and ≥750 mating cycles per IEC 60603-7 |
An HDBaseT chipset front-end connects to the RJ45 through magnetics that provide galvanic isolation and let PoH inject DC on the transformer center taps — the same principle as a BASE-T Ethernet port, just at higher bandwidth. There are two ways to place that magnetics stage:
Both do the same electrical job. If you are weighing the two placements, see our companion guide on integrated-magnetics (magjack) RJ45 jacks. Whichever you choose, for HDBaseT it should be shielded — see shielded vs unshielded RJ45.
The table below lists the datasheet parameters of a VOOHU Gigabit Tab-Up magjack, SYT511Q293AC1A8D057. It is a 1000BASE-T part, not an HDBaseT part — but it shows the electrical rigor of the same configurable family from which an HDBaseT-grade jack is ordered (the Cat6A/higher-bandwidth, higher-current member). Every figure is taken from the product datasheet.
| Parameter | Specified value | What it governs / reference |
|---|---|---|
| Turns ratio (@100 kHz) | 1CT:1CT, ±2% | PHY matching; tighter than the ±5% common in the market |
| Open-circuit inductance (OCL) | 350 µH Min (@100 kHz, 100 mV, 8 mA DC) | Low-frequency droop / PoH bias headroom |
| Insertion loss | ≤ 1.0 dB (1–100 MHz) | Signal level into the cable |
| Return loss | ≥18 dB (1–30 M) / ≥14 dB (30–60 M) / ≥12 dB (60–80 M) / ≥10 dB (80–100 M) | Impedance match; ANSI/TIA-568 budget |
| Crosstalk | ≥40 dB (1–30 M) / ≥35 dB (30–60 M) / ≥30 dB (60–100 M) | Pair-to-pair isolation |
| Common-mode rejection (CMR) | ≥30 dB (1–100 MHz) | EMI / emissions margin |
| Hi-Pot isolation (primary–secondary) | 2250 VDC (6 s, 1 mA) | Safety isolation; exceeds IEEE 802.3 1500 Vrms test |
| Durability | ≥ 750 mating cycles | IEC 60603-7 connector life |
| Mating force | ≤ 23 N | Insertion feel / panel design |
| Contacts / plating | Phosphor bronze C5210, 0.35 mm; 6 µ″ gold on contact area | Contact resistance & wear |
| Housing / shield | PBT UL94 V-0 body; C2680 brass shield, 0.20 mm, nickel-plated | Flammability & EMI |
| Integrated LEDs | Green (pins 11,12) + Yellow (pins 13,14) | Link / activity indication |
| Operating temperature | −40 ~ +85 °C (industrial grade) | Environment; family grades span 0~+70 to −40~+105 °C |
| Compliance | REACH & RoHS | Regulatory |
Values are the datasheet figures for one VOOHU Gigabit magjack, shown to illustrate the family's electrical quality. For an HDBaseT design, request the Cat6A-grade, higher-bandwidth and higher-current member of the same range and confirm against that specific part's datasheet.
Walk these axes top to bottom and you have defined the socket. For HDBaseT the first three are effectively fixed — shielded, Cat6A-grade, and PoH-current-rated — while the rest follow your mechanical and product needs.
| Selection axis | HDBaseT-oriented choice |
|---|---|
| Shielding | Shielded (FTP/STP) metal housing with EMI tabs/gasket — not UTP |
| Category grade | Category 6A performance for bandwidth and return-loss margin |
| PoH current | Per-port grade sized to the PoH budget (up to 1.5 A); non-saturating magnetics |
| Magnetics | Integrated (magjack) for a compact port, or discrete for independent tuning |
| Port array | 1×1, 1×N or 2×N sink-type modules to match the panel |
| Tab orientation | Tab-Up or Tab-Down to suit the enclosure |
| Mount | DIP (through-hole) or SMT |
| Temperature grade | −40 ~ +85 °C for AV racks, digital signage and outdoor endpoints |
Yes. HDBaseT runs over a standard 8P8C RJ45 connector on a single Category cable and reaches up to 100 m (328 ft) on Cat5e or Cat6, per the HDBaseT Alliance. Because the link carries up to 16 Gbit/s downstream and Power-over-HDBaseT, a shielded jack built to Category 6A performance is recommended for bandwidth and EMI margin rather than a basic Cat5e part.
Power over HDBaseT delivers up to 100 W across the four pairs of the cable, using a scheme based on IEEE 802.3at with modifications. The RJ45 jack — or the integrated-magnetics inside it — must carry that DC without saturating, so choose a socket with a high per-port current rating. VOOHU offers PoE/PoH-capable grades from 350 mA up to 1.5 A per port.
Shielded. HDBaseT's high bandwidth and the dense, noisy AV rack environment call for an FTP/STP shielded jack with a metal EMI housing and proper chassis-ground termination of the shield tabs. An unshielded (UTP) jack raises the risk of emissions failures and return-loss problems at HDBaseT frequencies.
Yes. VOOHU's integrated RJ45 family lists HDBaseT among its supported modes alongside 10/100M, 1G, 2.5G, 5G and 10GBASE-T. A magjack places the isolation magnetics at the connector, supports PoH center-tap injection, and shortens the path from the HDBaseT chipset to the socket; a discrete magnetics module feeding a plain shielded jack is the alternative when the magnetics need independent tuning.