The VSC7123 Extended Temperature Range (ETR) is a full-speed Fibre Channel and Gigabit Ethernet Transceiver with industry-standard pinouts, which operates down to -40o. The VSC7123 ETR accepts 10-bit 8B/10B encoded transmit data, latches it on the rising edge of REFCLK and serializes it onto the TX PECL differential outputs at a baud rate which is 10 times the REFCLK frequency. Serial data input on the RX PECL differential inputs is resampled by the Clock Recovery Unit (CRU) and deserialized onto the 10-bit receive data bus synchronously to complementary divide-by-twenty clocks. The VSC7123 ETR receiver detects "Comma" characters for frame alignment. An analog/digital signal detection circuit indicates that a valid signal is present on the RX input. A cable equalizer compensates for InterSymbol Interference (ISI) in order to increase maximum cable distances.