(1) Coaxial cable
The coaxial cable takes hard copper wire as the core and is covered with a layer of insulating material. This layer of insulating material is surrounded by a densely woven mesh conductor, and a layer of protective material is covered outside the mesh. There are many different specifications of coaxial cable, the most commonly used are thin coaxial cable and thick coaxial cable. Thin coaxial cables are mainly used for network connections in buildings, while thick coaxial cables are often used for connection between buildings. The difference is that the thick coaxial cable has better shielding and can transmit longer distances.
The coaxial cable is composed of a center conductor, a layer of insulating material, a shielding layer composed of a mesh fabric, and an external insulating material layer. Its structure is shown in Figure 1:
Figure 1-3-1 Schematic diagram of the coaxial cable structure
(2) Twisted pair
Twisted pair is the most commonly used transmission medium in integrated wiring projects. The twisted pair consists of two copper wires with an insulating protective layer. Twisting two insulated copper wires with each other at a certain density can reduce the degree of signal interference. The radio waves radiated by each wire during transmission will be canceled by the radio waves emitted by the other wire, compared with other transmission media The twisted pair is subject to certain restrictions in terms of transmission distance, channel width, and data transmission speed, but the price is relatively low. Currently, twisted-pair cables can be divided into unshielded twisted-pair cables and shielded twisted-pair cables.
The structure of the twisted pair is shown in Figure 2:
Figure 1-3-25 Category 4 pairs of unshielded twisted pair
(3) Optical fiber
Optical fiber is a kind of soft medium that can directly transmit light waves with a diameter of 50 ~ 100um, generally made of glass. The optical fiber is divided into: the transmission point modulus class is divided into single mode fiber (SingleModeFiber) and multimode fiber (MulTIModeFiber). The core diameter of a single-mode fiber is very small, and it can only be transmitted in a single mode at a given operating wavelength, with a transmission frequency bandwidth and a large transmission capacity. Multimode fiber is an optical fiber that can be simultaneously transmitted in multiple modes at a given operating wavelength. Compared with single mode fiber, multimode fiber has poor transmission performance. The basic structure of the optical fiber communication system is shown in Figure 3.
Figure 1-3-3 Basic composition of optical fiber communication system
DC (AGM Deep Cycle) series is specially designed for frequent cyclic discharge.
By using strong grids and specially designed active material, the DC series battery offers 30% more cyclic life than the standby series.
1. Long shelf life
It can be stored for a long time period and no need to recharge during storage. Battery left-over capacity can be as high as 70% after being stored for 1 year and can be restored to 85% of its full capacity when fully recharged.
2. Over-discharge performance under low voltage
This battery can be restored to 80% of its full capacity while others only being rendered to failure because of the sulfuration of the sulfur-acid and its consequent maintenance, after subject to a long period of repeated over-discharging due to frequently engine igniting, lighting and insufficient charge for the battery caused by short-distance driving and low speed.
3. Over-discharge performance under high voltage
Being charged at 16V(not recommended, though, this battery can be as high as 95% of its full capacity, no drying up in the electrolyte due to little gas releasing and all released gas being absorbed by the plates, while this kind of sealed lead-acid battery usually being charged by an external 14.8V charger which is designed with different emphasis between amperage and voltage(because the charge voltage for flooding lead-acid battery is usually at 16V, so the prevalent charge voltage is 16V, it will be soon rendered useless caused by drying out of the electrolyte if the ordinary battery being charged by a 16V external charger.
4. Quick charge acceptance
This battery can quickly absorb the momentary charging energy generated by vehicle _borne generator and braking, the testing date shows that it can absorb 70% of the energy released while others only 40%, after being charged under this kind of condition for 1 hour.
5. High multiple rates starting performance
Small in internal resistance and self-discharge, normal temperature starting discharge multiple rates can be as high as 8C20 while other ordinary battery can only reach 6C20, so this battery can be used to substitute high power battery.
6. Super long life span
This battery's life span is twice as long as ordinary battery's due to its slow capacity attenuate rate under repeated deep discharge cycles.
7. Super long life span Battery's consistency
The consistency and balanced discharge performance rendered special match for battery working group unnecessary and only need to replace the damaged one in case there is any, thus speeding the responsiveness of post-sale service.
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Starlight Power Industrial Company Limited , https://www.starlite-power.com