Comparison and difference between X.25 and Frame-Relay protocols

Comparison and difference between X.25 and Frame-Relay protocols

Due to the characteristics of early wide area network links: the unreliability of the link and the high bit error rate, the X.25 protocol is designed to be a rigorous, connection-oriented protocol, which corrects errors piece by piece during the entire transmission process Compared with flow control, the maximum frame length is 256 bytes, which is inefficient for the IP protocol.
In the later period, due to the greatly improved WAN link quality and the wide application of optical fiber, the Frame Relay protocol simplifies the third layer function of X.25, adopting the two-layer structure of the physical layer and the link layer, and only the link layer The core subset is simplified, the X.25 complex error correction and retransmission mechanism is simplified, the link layer is efficiently encapsulated, the maximum frame transmission length is increased to 1600 bits, which is suitable for the transmission of IP packets and improves the network. The efficiency of processing information.

12V UPS Charger, Restorer and Tester 3-in-1 Recovery system , is fit for 12V/36 Ah~300Ah lead-acid battery banks, With digital pulse charger, adjustable restorer and adjustable discharge Tester, high-performance of recover battery, convenient and reliable. Mainly used in the UPS industry of  Wind and Solar energy storage battery, UPS Back up power system, Telecom base site battery , State Grid and Military battery for sudden affair, etc.  It has been selected as a approval item of Chinese military cooperation products list, and as an important part of the military emergency combat system, as well as reducing a large number of military batteries back up power purchase cost than before.  

This 3-in-1 integrated Recovery system is composed of 3 parts and a professional standard restore process: 1) 12V Battery Restorer Device(36~300Ah); 2) 12V Battery Digital Pulse Charger; 3) 12V Battery Discharge Tester. It is applicable to all of Lead Acid UPS Battery(AGM, GEL, VRLA, Flooded, Dry, Deep cycle and Stationary), and widely used in 12V (36~300Ah) cell batteries. 

1) Digital pulse charger

4 Pulse charge channels , each channel have three ranges :10A, 15A, 20A , Select the right charging current according to the capacity and conditions of batteries , the system have a special IC to control automatically recharging without on duty. The multiple-stage pulse charger has the function of preventing battery dehydrated, preventing overcharged, and protect battery plate with equalized pulse charging function.
2) Non-destructive Smart Pulse Restorer 
8 Pulse restore channels for different capacity of batteries: 36Ah~75Ah, 75Ah~120Ah, 100Ah~300Ah. Selecting the suitable range can be ensure better protection of battery plate in restore working, and  extend batteries life up to 2 times than before. It is also called Battery Pulse Desulfurizer, Battery Refresher or Sulfuric Crystal Cleaner and maintainer
3) Discharge Capacity Tester
4 discharge channels of detecting and capacity testing , with discharge current range: 0A~ 20A(Output discharge current can be adjusted continuously and input power accurately.), current precision: ±1% and voltage error: 0.05V. Choose the right ranges of discharge current in order to improve the efficiency of battery recovery,  Prevent deep discharge and make sure the plates to be protected better.

12V UPS Charger Restorer Tester 3-in-1

12V UPS Charger Restorer Tester 3-in-1,UPS Battery Saver,12V UPS Charger Restorer Tester,UPS Battery Smart Charger and Tester

Shenzhen Daceen Technology Co., Ltd. , https://www.daceen-sz.com