Title: Subway Tunnel Communication Cable Images and Prices - A Comprehensive Guide
Subway Tunnel Communication Cable Images and Prices - A Comprehensive Guide: This comprehensive guide provides readers with a detailed understanding of subway tunnel communication cable images and their corresponding prices. The guide covers the various types of communication cables used in subway tunnels, such as coaxial cables, optical fibers, and twisted pair cables. It also includes information on the different sizes of these cables and their respective prices. Readers will find helpful illustrations of these cables and their installation process in subway tunnels. Moreover, the guide discusses the importance of maintaining proper cable management and hygiene to prevent damage and ensure safe operation of subway systems. Overall, this guide aims to provide valuable insights for professionals involved in the design, installation, and maintenance of subway communication systems.
Introduction:
Subway tunnels are vital components of modern urban transportation systems, ensuring the safe and efficient movement of passengers and cargo. The success of these tunnels relies heavily on the reliable communication system within them, which is made possible by the use of communication cables. In this article, we will provide an in-depth look at the different types of communication cables used in subway tunnels, along with their images and prices.
Section 1: Types of Communication Cables Used in Subway Tunnels
1. Coaxial Cables
Coaxial cables are perhaps the most common type of communication cable used in subway tunnels. They consist of a central conductor surrounded by two insulating layers. Coaxial cables are relatively inexpensive and easy to install, making them a popular choice for underground installations. Some common coaxial cable models include UPC (Unshielded Power Cable) and BNC (Banana Jack Connector).
Image 1: Coaxial Cable Model UPC
Image 2: Coaxial Cable Model BNC
Price Range: $10 - $50 per foot
1. Twisted-Pair Cables
Twisted-pair cables consist of two or more wires twisted together to form a single cable. They are commonly used for voice and data transmission in subway tunnels. Twisted-pair cables are available in various grades, with higher grades offering better performance and durability. Some common twisted-pair cable models include Cat5e (Category 5e Ethernet), Cat6 (Category 6 Ethernet), and Cat7 (Category 7 Ethernet).
Image 3: Twisted-Pair Cable Model Cat5e
Image 4: Twisted-Pair Cable Model Cat6
Image 5: Twisted-Pair Cable Model Cat7
Price Range: $25 - $100 per foot
1. Optical Fiber Cables
Optical fiber cables are used for high-speed data transmission in subway tunnels. They consist of long, thin fibers surrounded by protective layers. Optical fiber cables offer higher bandwidth and faster data transfer rates compared to coaxial and twisted-pair cables. Some common optical fiber cable models include SFP (+23) and SFP+(-10).
Image 6: Optical Fiber Cable Model SFP (+23)
Image 7: Optical Fiber Cable Model SFP+(-10)
Price Range: $100 - $500 per foot
Section 2: Factors Affecting Cable Prices
Several factors can influence the price of communication cables in subway tunnels, including:
* Material costs: The material used to manufacture the cable can have a significant impact on its cost. For example, copper-based materials like coaxial and twisted-pair cables tend to be less expensive than fiber optic cables due to their lower production costs.
* Grade: The grade of the cable determines its performance and durability. Higher-grade cables are typically more expensive but offer better performance and longevity.
* Length: The length of the cable also affects its price. Longer cables generally have a higher unit cost due to their increased manufacturing and shipping costs.
* Installation complexity: The installation process can also contribute to the overall cost of the communication cable. For example, installing optical fiber cable requires specialized tools and equipment, which can increase the labor costs associated with the installation.
a) Diameter of cable strands/cores = x cm2/m2 (where x is number of strands/cores)
b) Number of twists per inch = y turns/inch (where y is number of twists per inch)
c) Diameter of core = z mm = x*y*z/(pi*L*S)*10^9 m (where L is length of cable, S is surface area of cable sheathing)
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