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    This EOPM-4E1/T1 is a LAN to WAN converter that provides conversion from 10/100M Ethernet to multiple E1/T1 frame. The EOPM-4E1/T1 provides 25M bits/s byte interface with 2.5M bits/s control bus (MDIO). The EOPM-4E1/T1 support standard based GFP Frame encapsulation/de-capsulation with (X 43 +1) scramble and optional FCS (32-bit CRC).
    The External 32-bit SDRAM interface is employed to buffer the burst FE traffic from MII. Maximum 2K-byte and minimum 64-byte Ethernet length are checked. The illegal FE packets such as CRC-error packet and runt/over- size packet can be optional dropped or pass through.
    The framer block will search E1 frame in either  CRC-4 multi-frame or non-CRC4 frame-mode. For T1 mode, it only support ESF mode. The EOPM-4E1/T1 provides alarm reports for LOS, LOF, AIS, RAI (Far-End Failure) and LOM (loss of CRC-4 Multi-frame). It also provides code-violation, frame-error, E-bit counters for performance monitoring.

1.	Support both CRC4 and non-CRC4 frame mode for E1
2.	Support ESF frame mode for T1
3.	Support full duplex MII interface with IEEE 802.3 flow control
4.	Multiple E1/T1 Virtual Concatenation per ITU-T G.8040/G.7043
5.	GFP (Generic Framing Procedure) Encapsulation/De-capsulation per ITU-T G.7401
6.	Built-in 16-bit SDRAM controller to handle burst Ethernet traffic
7.	Support generic 8-bit microprocessor interface with interrupt capability
8.	Low power 3.3V I/O and 2.5V/1.2V core power supplies

1.	Media Converter
2.	Ethernet Over PDH Network
3.	CSU/DSU
4.	IPDSLAM

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