To understand the importance of the SDL queue parameters, you need to know about the call-throttling feature in CallManager. Selecting SDL Queue from the CallProcess view displays the number of signals and requests in various SDL queues and the number of processed requests. The information displayed under Gateway Activity assists you in evaluating the capacity of the PRI usage and assists you in troubleshooting issues with PRI when the channel is activated but not operating. Just wanted to add to the answers from Sankar and Greg (surely two of the best!!) ĬallProcess view displays information about call activity, gateway activity, trunk activity, and SDL queues. The description above is very self explanatory. Valid values specify 0 (disable throttling), 10, 20, 30, 40, 50, and 60. The default value of 30 seconds allows Cisco CallManager to have reasonable time to clean up the buffered messages and, at the same time, to allow the new legitimate call attempt to complete as soon as possible. If the timer has the value of 0, Cisco CallManager does not throttle new call attempts. By doing so, Cisco CallManager can protect itself from high CPU usage or crashing the system. When Cisco CallManager detects an unusually high number of call attempts for the H.225 trunk, which might be caused by events such as intercluster trunk looping, it triggers a call-throttling mechanism to reject the new call attempt with a switch system congestion cause code value. Miller, Computational Methods of Neutron Transport, American Nuclear Society, 1993, ISBN: 2-4.This parameter defines the length of time that Cisco CallManager will throttle the new call attempt after it detects an unusually high number of call attempts for the H.225 trunk. Hetrick, Dynamics of Nuclear Reactors, American Nuclear Society, 1993, ISBN: 3-2. Neuhold, Introductory Nuclear Reactor Dynamics, American Nuclear Society, 1985, ISBN: 9-4. Bezella, Introductory Nuclear Reactor Statics, American Nuclear Society, Revised edition (1989), 1989, ISBN: 3-2. Department of Energy, Nuclear Physics and Reactor Theory. DOE Fundamentals Handbook, Volume 1 and 2. January 1993. Robert Reed Burn, Introduction to Nuclear Reactor Operation, 1988.Physics of Nuclear Kinetics. Addison-Wesley Pub. Nuclear and Particle Physics. Clarendon Press 1 edition, 1991, ISBN: 978-0198520467 Nuclear Reactor Engineering: Reactor Systems Engineering, Springer 4th edition, 1994, ISBN: 978-0412985317 Stacey, Nuclear Reactor Physics, John Wiley & Sons, 2001, ISBN: 0- 471-39127-1. Baratta, Introduction to Nuclear Engineering, 3d ed., Prentice-Hall, 2001, ISBN: 8-1. Lamarsh, Introduction to Nuclear Reactor Theory, 2nd ed., Addison-Wesley, Reading, MA (1983). In this case of the throttling process (1.15MPa to 1MPa) the vapor quality increases from 87% to 87.4% and the temperature decreases from 186☌ to 179.9☌. H T, wet = h T,vapor x + (1 – x ) h T,liquid From steam tables we have to find the vapor quality using the same equation and solving the equation for vapor quality, x: Since it is an isenthalpic process, we know the enthalpy for point T. H D, wet = h D,vapor x + (1 – x ) h D,liquid = 2782. The enthalpy for the state D must be calculated using vapor quality: Assume the process is adiabatic and no work is done by the system. Determine the vapor quality of the steam when throttled from 1.15 MPa to 1.0 MPa. Steam leaves this stage of turbine at a pressure of 1.15 MPa, 186☌ and x = 0.87 (point D). A high-pressure stage of steam turbine operates at steady state with inlet conditions of 6 MPa, t = 275.6☌, x = 1 (point C).
0 Comments
Leave a Reply. |