Vertical Cross Connect – is a location within a building where cables originate and / or are terminated, reconnected using jumpers or pass throughs or are connected to patch panels or other similar devices where the locations are from upper or lower floors in the building. These cables could be of multiple different types and mediums such as phone networks, data lines, copper based, fiber channel, etc.
Horizontal Cross Connect – similar to Vertical Cross Connect locations; these are within a building where cables originate and / or are terminated but these locations are all on the same floor or building level. As with Vertical Cross Connect configurations, these locations can be of multiple different network types and mediums.
Patch Panel – wall or rack mounted collection of data connections where all of the network media converges. These rooms are generally some form of telecommunications closet in a facility and it is used to connect all of the different types of incoming and outgoing media types on the LAN. When they all span the same floor of a building they are sometimes referred to as Horizontal Cross Connect locations and when they span different levels of a location / different floors of a building they are sometimes referred to as Vertical Cross Connect locations. The main Patch Panel room will often be the connection point for the LAN to be connected to the WAN and / or the internet.
66 Block – is a legacy type of punch down block used to connect sets of 22 through 26 American Wire Gauge (AWG) solid copper wire in a telephone system. They have a 25-pair standard non-split capacity and generally are unsuited for traffic and data network communications above 10 megabits per second (Mbps).
Main Distribution Frame (MDF) – is a wire distribution frame for connecting equipment inside a facility to cables and subscriber carrier equipment outside of the facility. One example of this is where all of the phone cabling inside a facility is run to planned phone locations (e.g. offices) back to the MDF. When the local telephone company makes the external connections then all circuits are completed.
Intermediate Distribution Frame (IDF) – is another place much like a Horizontal Cross Connect location or a Vertical Cross Connect location where network administrators can physically change the network media around and where they can house other needed network equipment such as routers, switches, repeaters and so forth.
25 Pair – is a grouping of 25 pairs of wires all inside a single covering / housing or outer insulation casing. It is best suited for telephone / voice cable runs rather than data cable runs and is generally used as a feeder cable.
100 Pair – is a larger cabling segment to its 25 pair cousin but used in the same manner; all of the 100 pairs of wires are inside a single covering / housing or outer insulation casing. It is best suited for telephone / voice cable runs rather than data cable runs and is generally used as a feeder cable.
110 Block – is the more modern replacement of the legacy 66 Block and is used as a wiring distribution point for wired telephone systems (voice) and other types of wired networking (data). On one side of the block wires are punched down into RJ-11 connectors for voice and RJ-45 connectors for data communications.
Demarc – is the point of operational and administrative control change in a network. One example of this is the Main Distribution Frame (MDF) point in a facility. This is where the wire distribution frame for connecting equipment inside a facility to cables and subscriber carrier equipment outside of the facility occurs and this is considered a demarcation point of the operational control of the internal systems where it changes over to the control of the external presence.
Demarc Extension – where the end of the line of the external administrative control is extended beyond that actual endpoint. Example – you are one business inside of a large high rise building on the 15th floor only and the Main Distribution Frame (MDF) point is on the ground floor. Your responsibility probably ends at the Intermediate Distribution Frame (IDF) on your floor and the external administration (example – Phone Company) ends at the Main Distribution Frame (MDF) on the ground floor. The building administration owns all the cabling responsibility between the Main Distribution Frame (MDF) on the ground floor and your Intermediate Distribution Frame (IDF) on your floor. That cabling is effectively the Demarc Extension
Smart Jack – is a network connection device that is used to connect your internal network to an external service provider network. The device handles all of the code and protocol differences between the two networks and is often the actual demarcation point between the two service entities.
Wiring Installation – is the physical installation of internal wiring in a facility. This may be the pulls of copper phone and data lines to the running of fiber optic medium from the different cross connect locations.
Wiring Termination – is the end point of networked cable runs that will generally end either in a patch panel or a jack location in an office. This has historically been the copper wire runs associated with phone lines to the RJ-11 jacks / blocks to the data lines on the RJ-45 connections. Wire termination is also a consideration on fiber optic pulls as well which requires a higher set of skill level.
**Source by wikipedia**
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