What’s the E1?
The 30-channel pulse code modulation PCM in Europe is referred to as E1, and the rate is 2.048Mbit/s. There are two types of E1 interfaces, they are G. 703 unbalanced 75-ohm and balanced 120-ohm connectors.
Features of E1 Interface
1. An E1 link is 2.048M, encoded with PCM.
2. The frame length of an E1 is 256 bits, which is divided into 32-time slots, and the one-time slot is 8 bits.
3. There are 8k E1 frames per second through the interface, that is, 8K*256=2048kbps.
4. Each time slot occupies 8 bits in the E1 frame, 8*8k=64k, that is, one E1 contains 32 64K.
How to use the E1 interface
1. Use the entire 2M as a link, such as DDN 2M;
2. Use 2M as several 64k and their combinations, such as 128K, 256K, etc., this is CE1;
3. When used as a digital relay of a voice switch, this is also the most original usage of E1. An E1 is used as 32 64K, but time slot 0 and time slot 15 are used for signaling, so One E1 can transmit 30 channels of voice. PRI is one of the most commonly used access methods, and the standard is called PRA signaling.
Use 2611 and other WAN interface cards, and connect the E1 line through the V.35-G.703 converter. This cost should be lower than the E1 card. At present, the 2M rate line of DDN is usually pulled to the user side through the HDSL line. E1 can be pulled from the optical fiber from the transmission equipment to the optical transceiver on the user side to provide E1 services.
Well, the above is some information about the E1 interface. If you want to buy E1 products, please come to consult.