ITU G.704 E1 Framer/Deframer

Noesis Technologies ntE1_G704 Framer/Deframer is designed for E1 networks and is compliant with ITU recommendations G.704, G.706, G.732, G.775 and O.163. The core provides all the necessary data formatting transforms for transmission over an E1 carrier. E1 is one of the two most widely used TDM (time division multiplexing) carriers incorporating 32 channels, each with a
bandwidth of 64 kbps providing a total bit rate of 2048 kbps.

The ntE1_G704 IP core provides a flexible interface supporting hardware and microprocessor modes. Specifically the core can be connected to a host system either through an 8-bit parallel microprocessor interface (HP mode) or through a set of I/O ports (HW mode). When in HP mode, the microprocessor configures and monitors the functionality of the core through a rich set of registers. When in HW mode, the core is directly controlled and monitored through a set of dedicated ports and no microprocessor control is necessary.

At the transmit side, the framer generates framing patterns, CRC4 bits, formats outgoing and signalling data, generates alarms and clock outputs for data conditioning and decoding. At the receive side, the deframer establishes frame / multiframe synchronization, extracts data, signalling and alarm flags. It provides information like frame, multiframe alignment, calculates CRC4, counts CRC4 errors and performs A-bit processing.