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 Fibre Channel (FC) is a high-speed data transfer protocol (commonly running at 1, 2, 4, 8, 16, 32, 64, and 128 gigabits per second rates) providing in-order, lossless delivery of raw block data. Fibre Channel networks form a switched fabric because the switches in a network operate in unison as one big switch. An FC fabric is a switched network topology that interconnects FC devices using FC switches, usually to create a SAN. An FC switch is a Layer 3 network switch that is compatible with the FC protocol, forwards FC traffic, and provides FC services to the components of the FC fabric.
 FCIP(Fibre channel over IP) is a IP-based protocol that is used to connect distributed FC-SAN islands. Creates virtual FC links over existing IP network that is used to transport FC data between different FC SANS. It encapsulates FC frames into IP packet. It provides disaster recovery solution.
 iSCSI is an IP based protocol that establishes and manages connections between host and storage over IP. iSCSI encapsulates SCSI commands and data into an IP packet and transports them using TCP/IP. iSCSI is widely adopted for connecting servers to storage because it is relatively inexpensive and easy to implement, especially in environments in which an FC SAN does not exist.
VTU      Semester -5    Subject -
 

Applications for FCIP include:  

 

1.Remote data asynchronous replication to a secondary site. 

 

2.Centralised SAN backup and archiving, although tape writes can fail if packets are dropped. 

 

3.Data migration between sites, as part of a data centre migration or consolidation project.

 

The forms of bitumen are as follows:-

  1. Cutback bitumen 
  2. Bitumen Emulsion 
  3. Cutback  Bitumen 
  4. Bituminous  primers 
  5. Modified Bitumen 

1. Cutback bitumen 

         Normal practice is to heat  bitumen to reduce its viscosity. In some situations preference is given to use liquid binders such as Cutback bitumen.  In Cutback bitumen suitable solvent is used to lower the viscosity of the bitumen. Cutback bitumen is used for cold weather bituminous  road construction and maintenance. 

2.Bitumen Emulsion 

         Bitumen emulsion is a  liquid product in which in which a substantial amount of bitumen is suspended in a finely divided condition in an aqueous medium and stabilized suitable material The Bitumen emulsion may be of anionic type or cationic type. Three types of bitumen emulsion  are available Rapid setting (RS), Medium setting (MS), and Slow setting (SS).

3.Cutback Bitumen 

       Cutback bitumen is obtained by blending bitumen blinder with suitable diluent or solvents in the required proportion to reduce its  viscosity tobthe desired range. Cutback is available in three types,  Rapid curing (RC), medium curing (MC), slow curing (SC).

4. Bituminous primers 

      In Bituminous primers the distillate is absorbed by the road surface in which it is  spread. The absorption there for depends on the porosity of the surface. 

 

Flexible pavement will transmit wheel load stresses to the lower layers by grain - to -grain transfer through the points of contact in the granular structure.  The wheel load acting on the pavement will be distributed to a wear area, and the stress decreases with the depth. Taking advantage of this stress distribution characteristics the lower layers will experience lesser Magnitude of stress and less quality material can be used.  Flexible pavements ate constructed using bituminous  materials. 

Types of Flexible pavement 

  1. Conventional layered Flexible pavement
  2.  Full depth asphalt pavement 
  3. Contained rock asphalt mat (CRAM )

1.   Flexible pavement are layered  systems with high quality expensive materials are placed in the top where stresses are high, and low - quality cheap materials are placed in lower layers.

2. Full depth asphalt pavement are constructed by placing bituminous  layers directly on the soil subgrade . 

3. Contained rock asphalt mats are constructed by placing dense/open graded aggregate layers in between two asphalt layers.

 

 

This is a penetration test developed by the California division of highway . For evaluating the stability of soil subgrade and other pavement materials.  The test results have been correlated with flexible pavement thickness requirements of highway and airfield.  CBR test may be conducted the laboratory in a prepared specimen in a mould or in situ in the field. 

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