Optical modules are available in various types to meet diversified requirements. 5GE, FE, and GE optical modules. These modules are typically installed in Optical Line Terminals (OLTs) at the service provider's central office and Optical Network Units (ONUs) or Optical Network. Juniper Networks® has platforms ranging from the Juniper Networks CTP Series Circuit to Packet Platforms, BX Series Multi-Access Gateways, E Series Broadband Services Routers, M Series Multiservice Edge Routers, MX Series 3D Universal Edge Routers, to the T Series Core Routers. These platforms. This document describes the Gigabit Passive Optical Network (GPON) technology and how it functions. Where support for a Revision A, B, or C transceiver existed, Revision D or E parts are also supported.