E4, STS3, OC3/STM1
The HRC is a mezzanine board that pairs with an EDT main board (for PCI or PCI Express) for high-speed data transfer. It supports both electrical signals (E4 or STS3) and optical signals (OC3/STM1) in various combinations.
The board has four connector slots; each supports either an electrical BNC 75-W CMI coaxial interface, or an optical LC 1310 nm NRZ single-mode transceiver. The BNCs can be set by programmable control as either input or output; if bidirectional operation is required, a maximum of two channels will be usable.