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Small rectangular adapter with RJ45 female and DB9 female ports, matte black finish

Vertiv

Vertiv ADB0036 modular adapter RJ45 to DB9F crossover

SKU CH-EZJ6-03NCM MPN ADB0036

A modular crossover adapter connecting an RJ-45 female network port to a DB-9 female RS-232 serial console port

  • Changer TypeDB9 to RJ45
  • FeaturesRJ-45F to DB-9F crossover adapter
  • Crossover wiring connects console servers directly to network equipment
  • RJ-45 female to DB-9 female fits standard serial ports
  • Modular adapter integrates with existing RJ-45 cabling infrastructure
  • Designed for servers, modems, HVAC and UPS console access
  • Enables RS-232 serial communication over structured wiring installations

Modular RJ45 to DB9F crossover adapter

The Vertiv ADB0036 modular adapter converts a standard RJ-45 console port into a DB-9F serial connection. It is built for network engineers and system administrators who manage servers, switches, modems or infrastructure gear such as HVAC and UPS units through a console server. The crossover wiring ensures the correct signal mapping between the two interfaces without an extra cable.

Practical limits of the RJ-45 and DB-9 interface

This adapter passes the signals present on the console port; it does not convert voltage levels or protocols beyond the physical pin rearrangement. The DB-9 side follows the RS-232 electrical specification, so the connected equipment must operate at compatible signalling voltages. Cable length and signal integrity remain governed by the cabling attached to the RJ-45 female jack and the serial device plugged into the DB-9 female connector.

Installation notes and common issues

Installation is a simple push-fit: seat the RJ-45 plug into the console port and secure the DB-9 screw locks to the serial cable or device. The most frequent problem is a pin-out mismatch when the adapter is used with a straight-through cable instead of the required crossover wiring, which results in no communication. Verify that the console port is wired for the crossover pin assignment before assuming the adapter is faulty.

Highlights

  • Crossover wiring connects console servers directly to network equipment
  • RJ-45 female to DB-9 female fits standard serial ports
  • Modular adapter integrates with existing RJ-45 cabling infrastructure
  • Designed for servers, modems, HVAC and UPS console access
  • Enables RS-232 serial communication over structured wiring installations

Specifications

BrandAvocent
ModelADB0036
Changer TypeDB9 to RJ45
FeaturesRJ-45F to DB-9F crossover adapter
Shipping weight0.23 kg
Package size127 × 102 × 23 mm

Questions about this item

Is the ADB0036 the right modular adapter for connecting a console server to a standard DB-9 serial port?

Yes, the ADB0036 is an RJ-45 female to DB-9 female crossover adapter designed to connect console servers to the standard console ports of servers, network gear, modems and infrastructure equipment.

What does the crossover wiring do when the adapter is installed in a rack?

The crossover wiring aligns the transmit and receive lines so the RS-232 serial signals pass correctly between the RJ-45 console cabling and the DB-9 port without needing a separate null-modem cable.

Which serial standard does the DB-9 side of the ADB0036 follow?

The DB-9 female connector follows the RS-232 serial standard used by standard console ports on servers, network equipment, modems and infrastructure devices.

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