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Twinax Cable Knowledge
- Cable Labeling as Part of Data Center Management
- How to Correctly Run cables On Servers in a Data Center?
- 4 Realities You Should Consider 10G Ethernet for Your Business
- Is it finally the end of copper?
- Why We Need Both 40G and 100G Ethernet Cable?
- What is Twisted Pair Cable?
- Benefits of Twisted Pair Cable Construction
- Why Copper Is Used in Cables?
- A Brief Look at Ethernet Cable Construction
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Twinax Cables are mainly used with PCI or PCI-E Card for the short distance interconnection in the server room.
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Performance Feature
Stable Transmission Speed
Reliable Transmission
Various Length Selection
Wider Operating Temperature
Good for HPC
Good for Data Center
Twinax Cable Knowledge
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Modular Data Center Infrastructure
The cabling and infrastructure design for a modern data center is governed by multiple factors. The TIA/EIA-942 Telecommunications Infrastructure Standard for Data Centers provides guidelines for data center cabling infrastructure that customers can adopt as a guide in the data center cabling and planning process.
Other standards, such as BICSI, provide guidelines for data center cabling and implementation. The TIA/EIA-942 cabling specification considers the need for flexibility, scalability, reliability, and space management. While the standard provides guidelines, specific design elements will vary with each data center. General considerations that apply to all data centers include:
- Support for storage devices (Fibre Channel, Small Computer System Interface [SCSI] or NAS, FCoE, etc.)
- Support for convergence and unified fabric with growth factors incorporated
- Reliability, scalability, and redundancy
- High-capacity and high-density server access requirements
- Flexibility and expandability with easy access for moves, additions, and changes
- Migration from Gigabit Ethernet to 10 Gigabit Ethernet server connectivity with future support for 40 and 100 Gigabit Ethernet
- Cabling architecture balance with power, cooling, structural loading, management, and operations needs
In the context of the TIA/EIA-942 simplified logical data center layout, the ToR architecture maps directly to the EDA and the horizontal distribution area (HDA). Figure 1 shows a mapping of the logical network architecture to the physical infrastructure.
Figure 1 TIA/EIA-942 Logical Layout
The EDA in the TIA/EIA-942 logical layout corresponds to the area where server racks are placed. Traditional structured copper cabling with a mix of fiber if needed for SAN or high-speed server connectivity is used to connect the EDA to the HDA.
The environment requires careful planning to help ensure that the structured cabling meets the initial design requirements with enough room for growth. In cases where server racks are not yet in place or without the physical infrastructure needed to support rack-level flexibility, a zone distribution area (ZDA) cabling model is used.
The ZDA allows for structured cabling to be placed under the floor or above the rack in anticipation of future server racks requiring connectivity to the network equipment that may be housed in the HDA. The ZDA follows a structured cabling model to the HDA. The primary difference in the horizontal cabling model between the ZDA and EDA is that the cables are terminated in the EDA racks, whereas the ZDA uses zone distribution blocks located outside the server racks.
The ToR cabling and network architecture in Figure 1 optimizes the requirement for horizontal cabling from the server rack by placing the ToR aggregation device at the top of the server rack. Actual placement of the ToR device may vary based on customer requirements (for example, in or above the server rack or ToR aggregation per two or three server racks) and seeks to optimize customer requirements for density, cabling, and design methodology.
The aggregation of the ToR device will be in the HDA based on the specific TIA/EIA reference cabling model deployed. The ToR cabling design model follows a logical network layer construct in which the server network connectivity is aggregated at the rack level in the network access layer. The access layer is in turn connected to the network aggregation layer.
The ToR model uses fiber as the backbone cabling infrastructure that connects the EDA with the HDA and main distribution area (MDA). The ToR model augments the TIA/EIA-942 logical approach shown in Figure 1 by extending fiber as the backbone cabling of choice to the EDA or server rack.
The amount of fiber required will vary based on design requirements. For example, in a migration-type design in which a ToR model is used for Ethernet aggregation and Fibre Channel connectivity is not unified I/O (UIO), additional fiber will be required for those servers requiring Fibre Channel connectivity.
In models in which UIO for Fibre Channel and Ethernet is assumed, the fiber requirement to the rack will be reduced. Other design augmentations, such as ToR for few racks with inter-rack cabling, will modify the fiber requirements. These are a few examples of some deployment models that have been adopted based on particular environment and requirements.
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