All Things Regarding Change Ports
There are only 2 major switches that work with most if not all FTA receivers and regular(legacy) LNBs they are:
22khz switch, connects two LNBs to one receiver
DiSEqC 4×1 switch, connects approximately 4 LNBs to just one receiver.
This makes it possible for both polarities from every LNB to be inside the change at all times, so any from the 4 receiver can entry any polarity on either with the 2 LNBs.
These switches also are available in a 4×8 for approximately 8 receiver hook ups to 3 satellites.
DiSEqC is a pulse switch, it also uses a 22khz signal but it uses a one time pulse to set the DiSEq alter to one of 4 ports, these switches come in 2×1 and 4×1 models, for 3 LNBs to ONE receiver or 4 LNBs to ONE receiver, respectively, these can NOT be utilized for a lot more than one receiver, you ought to use a different DiSEq move for second receiver.
DiSEqC-1 or a couple of or three or 4 with your menu will result in the DiSEqC change to alter to that numbered port, some receivers use A, B, C, D as opposed to 1, 2, 3, 4.
This “pulse” is only sent once, if the DiSEq move is always to far away in the receiver it can miss it and not change ports, some times toggling back and forth between channels can make the adjust happen, the pulse is repeated each time you alter channels, but moving the switch closer towards receiver can improve its performance.
DiSEqC = Digital Satellite Equipment Control, this was intended for FTA receivers.
DiSEqC switches come in only two principal flavors, Committed(1.0) and Uncommitted(1.1), but also Committed 2-way(2.0) and UnCommitted 2-way(2.1).
Committed(1.0) switches are the most typical and are what come with the receivers.
These switches need FACTORY software in your FTA to run properly, 1.0 means your receiver can operate Committed switches ONLY, 1.1 suggests it can function Committed AND UnCommitted switches, 1.2 signifies it can work Committed and UnCommitted plus DiSEqC motor controls.
2.0 could be the exact same as above, 2.0, 2.1, 2.2 but the receiver can also acquire data back in the switch, 2.0 switches obtain the pulse command from your receiver, then adjust ports, they then send back a confirmation towards receiver, if a 2.0 receiver doesn’t receive the confirmation it will send the DiSEqC pulse again and once more until the move confirms it can be on the correct port.
As a CCNA/CCNP candidate you’re expected to understand the reason and function of Spanning-tree Portfast. The CCNA/CCNP’s exam will ask of you to decide the goal with the Portfast within the spanning-tree protocol.
Before we go into the detail for the objective and operation in the Portfast feature we have to comprehend the switched network environment behaviour prior to the introduction of portfast as being a command..
Putting 3 DiSEqC Committed switches on a single cable is a no-no, which is why you will find Committed and UnCommitted kinds of switches, a Committed swap is placed initial in line (DiSEqC pulse comes from your receiver so 1st would be closest towards the receiver), then you can hookup an UnCommitted switch on the Committed switch, the Committed alter will ignore the UnCommitted switches commands.
There are no multiple receiver DiSEq switches for Legacy(regular) style LNBs
22khz switches and DiSEq switches can perform well together, with one restriction, the 22khz move must are available AFTER the DiSEq switch.
From the “BPDU Guard” article you’ll recall that the stability from the Root Bridge is of paramount significance inside operation and continual uninterrupted service of spanning-tree and that a adjust within the position in the Root Bridge will trigger service disruption about the network; another critical factor to bear in mind is that is certainly it not just the changing of the position of the Root Bridge that can cause network disruption but events for example access switchports transitioning on/off line can develop an unstable network.
When a port 1st goes on-line spanning-tree will treat it like it treats any other port and will cycle via the normal spanning-tree port roles, i.e. blocking, listening. Learning, forwarding. The port will transition for the forwarding state immediately after 30secs. In which no user traffic is allowed to pass.
If you decide that the information is helpful you might also want to be finding out about Tomcat Change Port.
Posted by admin on July 21st, 2010 :: Filed under Satellite TV
Tags :: one, receiver, switch, two