Europe's 3-channel pulse code modulation PCM is abbreviated as E1, and its speed is 2.48mbit/s.
the FE interface, also known as the Fe port, is the abbreviation of fast Ethernet, that is, fast Ethernet, which is the name of the mainstream 1M network at present. It is also commonly referred to as a 1-megabit network, with optical fiber and ordinary cable interfaces. Commonly used FE and GE mostly refer to port configuration.
GE interface refers to Gigabit Ethernet gigabit Ethernet interface, and the interface marked with GE means 1M Ethernet network interface. This kind of interface has optical fiber interface and electrical interface.
China adopts the European E1 standard. A time-division multiplexed frame of E1 (its length is t = 125US) is divided into 32 equal time slots, and the number of time slots is CH~CH31. Among them, time slot CH is used for frame synchronization, time slot CH16 is used for signaling, and the remaining 3 time slots CH1~CH15 and CH17~CH31 ***3 used for 3 sessions. Each time slot transmits 8 bits, so * * * uses 256bit. 8 frames are transmitted every second, so the data rate of PCM primary group E1 is 2.48 mbit/s.