The fiber optic modem 38002188-100 replaces the NGIO card in an NG module to provide a direct connection to the fiber optic PIN. The modem takes as input from the NGI, signals as described in ANSI/IEEE standard 802.4.
The ANSI/IEEE standard also establishes standards for the fiber optic side of the modem. However, to achieve the long distances required of the PIN, 802.4 compatibility in fiber optics must be abandoned. The standard calls for nominal 850 nm optics that are capable of, at best, a repeater less distance of 2.5 km.
The fiber optic modem for the PIN uses 1300 nm optics and ST style fiber optic connectors. The modem provides signal encoding, signal decoding, clock recovery, and station management functions. The modem has LED indicators for Transmit, Receive, and Bad Signal/Jabber.
The Fiber optic modem (HPN-38002188-100) was manufactured by CD Networks. FOM 38002188-100 replaces the carrierband Network Gateway I/O 51304472-100.