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=**__Nvision 8144 router__**=

The Nvision 8144 router, made by Miranda, it has high flexibility and density likewise to the rest of the NV8500 family. They support standard definition, high definition and 3.Gbs of video signal as well as Asynchronous audio signals. The Nvision 8144 can be used as a standalone 144x144 matrix although some of the Nvision models can be connected together to make large matrices.  The Nvision 8144 can make connections from one input to one output and can also connect one input to many outputs.  In all of the Nvision 8500 family the input cards, output cards, control cards, crosspoint cards, monitor cards and power supplies are all "hot swappable", this is to allow the system continue working without any interruption due to maintenance. All the cards are accessible through the front panel. Facing the front of the router, on the left hand side you have the output cards which there are 8 of, these link with the output backplanes to make up to 144 outputs. next is the monitor card, this is a single card used for monitoring signals coming in and out the router, next there is 2 crosspoint cards (one optional) this is where all the switching is done. Behind the cards are the control connections. The next 16 cards are use for input cards, the total input connections from these cards are 144 inputs. On the far right are the 2 control cards, which control the crosspoint cards. Above the cards is the fan tray, used for extracting the hot air. Below the cards there are 2 power supplies, one redundant for backup if the other fails. All the cards are behind a front plate which must be removed to access the cards for maintenance.

The rear of the Nvision 8144 there is the system connections and backplanes. When facing the rear of the Nvision 8144 the left section has a blank plate, this is where the control cards are. Next to the control card plate is the router inputs, there are 16 backplanes for input connections, and each backplane can contain 9 connections, these correspond to active card inputs. The middle (slightly to the right) section contains all the system connections, such as reference signals for audio and video and the control systems. Behind the system connections are the crosspoint cards. Beside this is a single monitor backplane, used for connecting test equipment for checking things like the signal quality, this corresponds with the monitor card. To the right of the Nvision 8144 are the output connections, there are 8 backplanes in total, each containing 18 connections, each backplanes corresponds with the output cards. All the system cards must be installed through the front. At the top of the frame there is the exhaust grills for keeping the system cool by the fans in the fan tray. At the bottom there is the power connections, there are two power supplies modules. Next to the left side power connection is the alarm connection.



The backplanes can be changed for different types of connections; these include fiber, coax (DIN 1.0/2.3) and AES connections.

in previous installations you needed 2 routers one for video signals and one for audio signals, with the Nvision 8144 this is not the case, this is because the router has audio processing built in, this helps to bring down the cost of setting up a studio installation

 the Nvision 8144 fits within a standard 19" rack, and takes up 8RU (13.97" or 0.355m). The depth of the frame is approximately 17" but for installation you would need to have an extra 3" more for clearance and cabling, though you must make sure to leave enough space for airflow through the front and rear of the router.



With any of the Nvision 8500 family you can use the Nvision 9500/915 controllers. The remote control panels include highly configurable hardware and virtual control panels. They provide all the features, functions and redundancy essential to address a broad range of applications, from the smallest television station to the largest uplink and origination centres



A router is a device used to switch incoming signals to a designated output connection, without the need to change it with patch bays. Any input connection can be sent to any output connection; it can also be sent to multiple output connections, acting like a DA. The switching of the signals are configured by a router control system, this sends commands to the control card which in turn directs how the switching occurs on the crosspoint card. The Nvision 8144 can house two crosspoint cards, one required for switching and the other for redundancy, this help to make the system more suitable for a broadcast environment where there should be no single point of failure.  Each standalone router switches signals via the crosspoint card differently. In a fully loaded Nvision 8144 frame, all inputs are sent to the crosspoint cards for distribution to any or all outputs.

 When installing the router it is recommended that you put all the inputs and out through jackfeilds, this is so that in the unlikely event of the router failing you can still continue to use the facilities to an extent. but this is not necessaries.

 An example of a system using the Miranda Nvision 8144, is the one used by the educational institute Ravensbourne. Although the router can support up to 144 x 144, Ravensbourne has there’s set up for 72 x 72, this is to allow for further expansion within their new building. The router in this system is used primarily for video signals in this system but dose deal with embedded audio. In the Ravensbourne system the router inputs are the studio cameras, the Kahuna mixer, GFX V, ingest devices like VTR's and DVD, the audio post, online editing, pres, TX, down converter output and test signals, these can then be routed to the outputs which are things like the studio PGM, links to the recording server, PVWs,edit suites, VTRs and DVD recorders, studio wall box , the Kahuna mixer, the down converter and many more. The Ravensbourne system uses the Nvision 9601 XY/multi-destination panel, which takes up 2RU.

﻿Cad drawing of the Ravensbourne system.