Vesda Xtralis VSR- Subrack The 19 Subrack is used for grouping up to 4 Remote Modules. The 19 Subrack assembly is used when multiple modules are required to be located in standard 19 in. racks. An optional wall mounting bracket is available for a single Subrack. The Subrack is secured by bolts to a Standard 3U Subrack System. If the 19 Subrack is to be mounted onto a wall, first fasten the optional wall mounting bracket to the wall and then install the 19 Subrack onto the wall mounting bracket. It is open at the back facilitating easy cabling between the power source, or VESDAnet and the remote termination card or the VESDAnet socket card. There are four holes in the dividing panel of the Subrack for wiring between the front and the back. VESDAnet and power connections are installed by default in the factory.