Vertiv ADB0036 RJ45 to DB9F Serial Cross Converter
Overview
The Vertiv ADB0036 is a serial adapter that converts an RJ-45 Male connection to a DB-9 Female (DB9F) interface using a cross-wired configuration. If you manage console access to network equipment, Vertiv serial infrastructure adapters like this one solve the wiring translation problem at the physical layer — no configuration, no drivers, no firmware. Plug it in and the pinout conversion is handled in the connector itself.
Cross converters differ from straight-through adapters: the ADB0036 remaps the pin assignments between the RJ-45 and DB-9 interfaces, which is the correct wiring arrangement for connecting devices that both present data as DTE or both as DCE. If you are bridging a console server RJ-45 port to a legacy DB-9 serial device, this is the adapter that resolves the cross-wiring without custom cables.
Key Features
- RJ-45 Male to DB-9 Female interface: Mates directly to a DB9F-equipped serial port on legacy equipment — routers, switches, terminal servers, PDUs — without requiring a custom-pinned cable. The male RJ-45 plugs directly into your console server or management port.
- Cross converter wiring: Pin assignments are crossed internally, so you do not need to source or build a cross-wired cable separately. This is the detail that catches integrators off guard when a straight-through adapter fails to produce output on the terminal.
- Compact inline form factor: No additional cable length, no external power, no housing — just the adapter. Useful in dense rack environments where cable management matters.
- Part of the Vertiv serial adapter family: The ADB0036 is the RJ45-to-DB9F cross variant. Related models include the ADB0037 (RJ45 to DB9M cross) and the ADB0039 (RJ45 to RJ45 Sun/Cisco cross) — so you can standardize on the same adapter series across mixed serial environments.
Integration and Compatibility
The ADB0036 is designed for use with Vertiv KVM and serial console infrastructure — specifically with console servers and KVM switches that use RJ-45 serial ports. It is compatible with equipment presenting a DB-9 Female serial interface, including legacy network devices, serial-attached PDUs, and out-of-band management ports. When pairing with a DB9M-equipped device instead, use the ADB0037. For Sun/Cisco RJ-45 cross wiring between two RJ-45 ports, see the ADB0039 in the same family.
If you are building or expanding a serial console access infrastructure, stocking all three adapter variants covers the majority of cross-wiring scenarios in mixed-vendor data center environments without custom cable orders.
Frequently Asked Questions
Q: What is the difference between the ADB0036 and the ADB0037?
A: The ADB0036 terminates in a DB-9 Female (DB9F) connector; the ADB0037 terminates in a DB-9 Male (DB9M) connector. Choose based on the gender of the serial port on your target device.
Q: Is the ADB0036 a cross converter or a straight-through adapter?
A: It is a cross converter — the pin assignments are remapped between the RJ-45 and DB-9 interfaces. This is required when connecting two DTE devices or two DCE devices directly. A straight-through adapter would not produce a working serial connection in those scenarios.
Q: Does the ADB0036 require any drivers or external power?
A: No. It is a passive hardware adapter — no drivers, no firmware, and no external power supply needed. It handles the wiring translation entirely at the physical connector level.
Q: What Vertiv products is the ADB0036 designed to work with?
A: The ADB0036 is part of the Vertiv serial adapter accessory line and is intended for use with Vertiv console servers and KVM switch platforms that use RJ-45 serial ports, bridging to legacy DB-9 serial-equipped devices.
Q: Can I use the ADB0036 with non-Vertiv equipment?
A: The adapter is a standard physical connector conversion (RJ-45 Male to DB-9 Female, cross-wired). Compatibility with non-Vertiv equipment depends entirely on whether the pinout and cross-wiring arrangement matches your specific device's serial port requirements — verify against your device's serial pinout documentation before ordering.
The detail that trips up most integrators with the ADB0036 is right in the name: it is a cross converter, not a straight-through. When you are bridging an RJ-45 console server port to a DB-9 Female serial interface on a managed switch or legacy PDU, the cross wiring is what actually makes the serial session come up — a straight-through adapter in that scenario gives you silence on the terminal, and you spend 20 minutes reseating cables before realizing the pinout is the issue.
Technical Highlights:
- RJ-45 Male to DB-9 Female: The male RJ-45 mates directly to the console server port; the DB9F end accepts the DB9M port found on most legacy serial-attached devices — no gender changers needed in a standard deployment.
- Cross converter wiring: Internal pin remapping handles the DTE-to-DTE or DCE-to-DCE crossing at the hardware level. No software configuration, no null modem cable required alongside it.
- Family coverage: Paired with the ADB0037 (DB9M variant) and ADB0039 (RJ45-to-RJ45 Sun/Cisco cross), the three adapters together cover the most common serial cross-wiring scenarios in mixed-vendor racks — standardizing on one adapter family simplifies spares inventory.
Deployment Considerations:
- Before ordering, confirm the gender of the DB-9 port on your target device. The ADB0036 presents a DB9F end — if your device has a DB9F port (requiring a DB9M mate), order the ADB0037 instead.
- This is a passive adapter with no active components. It cannot compensate for baud rate mismatches, flow control conflicts, or pinout deviations from standard Vertiv console server wiring — verify serial settings on both ends before assuming a hardware fault.
The ADB0036 is the right call for out-of-band serial console access deployments where legacy DB-9 Female serial ports need to integrate with Vertiv RJ-45 console infrastructure — particularly in data centers running mixed-generation network gear where custom cable orders are slower than keeping the right adapter on the shelf.
