Mitel 3300 Technician's Handbook page 71

Installation
system to cross-connect field cables and cross-connect
field hardware) is not supplied by MITEL. Therefore, the
type of equipment used and the layout of the
cross-connect field cables is at the discretion of the
installation company. Installation information for such
equipment must be obtained from the equipment
manufacturer.
Figure 7. Peripheral Unit Backplane Connector
Arrangements
53