The carrierband NGI I/O 51304472-100 is obsolete.
The Network Gateway (NG) is a node specifically developed to provide a communications path between two or more Local Control Networks (LCN).
A Network Gateway Plant Information Network, referred to as PIN, is any network capable of conforming to IEEE 802.4. There are two types of PIN supported by the Network Gateway.
* Carrier Band network such as the Universal Control Network (UCN)
* Fiber Optic network physically configured as a star network.

The PIN consists of two single-cable networks. This differs from the LCN, which is a single network with redundant cables. Carrier band PIN is implemented using the Universal Control Network (UCN) hardware. The carrier band (CB) modems are called NIMModem (boards). These are I/O paddleboards that plug into the I/O slots of the NG node itself. Each modem has two outputs, but only the B output is used, one modem per cable. It is recommended that A output be terminated on the CB modem.

The Fiber Optic Modem part number is 38002188-100.
The Carrierband UCN Network Gateway I/O was replaced by Honeywell with the NIM Modem 51304511-100.