The 5120-P1, manufactured by Allen-Bradley, is a power supply module that features 35 Amps. It also operates on 12 Volts DC and has 170 WATT, as well as featuring a pyramid integrator AB. This module belongs to the series B; several communication devices can be used to extend a simple Local Area Network (LAN), so that it can become more complex and far-reaching. The four communication devices that can be used include a repeater, a bridge, a router, and a gateway. The repeater is a communication device that can be used to upgrade the LAN in the 5120-P1 module. It aids in the connection of two segments of the LAN cable, therefore extending the cable distance limits. The bridge may be used to aid in the isolation of traffic between networks; it performs function connections just as the repeater does and also filters MAC addresses, therefore isolating the traffic between networks. The router helps to filter and direct IP addresses, while the gateway, on the other hand, helps in the translation of different protocols when connecting two or more networks all of the different types.

This 5120-P1 module has been designed to accept a block-transfer. Typically, it has the ability to accept 64 words of data when it comes to block-transfer acceptance. It is, however, important to confirm if any system designed is able to accept block-transferred data. If it cannot accept block-transferred data, then the system could experience an unpredictable behavior. Further damage would also be caused, in the sense that the interchange application program might not receive any error.