Cables and Connectors Flashcards
1
Q
Phone Cable
A
Connector: RJ11
dial up connection
2 pairs of twisted cable ( a total of 4 wires)
2
Q
Cat 3
A
Connector: RJ45
designed for 10 megabit Ethernet or 16 megabit token ring
3
Q
Cat 5
A
Connector: RJ45
supports 100 megabit Ethernet and ATM networking
also supports gigabit (1000 Mb) ethernet
4
Q
Cat 5e
A
Connector: RJ45
provides better EMI protection than Cat 5
5
Q
Cat 6
A
Connector: RJ45
Supports 10 Gbps Ethernet and high-bandwidth, broadband communications
Cat 6 cables often include a solid plastic core that keeps the twisted pairs separate and prevents he cable from being ben too tightly
6
Q
Cat 6a
A
Connector: RJ45
Designed to provide EMI protection than Cat 6.
Cat 6a provides better performance than Cat 6 especially when used with 10Gbps Ethernet
7
Q
RJ11
A
- Has 4 connectors
- Supports up to 2 pair of wires
- Uses a locking tab to keep connector secure in outlet
- Used primarily for telephone wiring
8
Q
RJ45
A
- Has 8 connectors
- Supports up to 4 pairs of wires
- Uses a locking tab to keep connector secure in outlet
- Used for Ethernet & some token ring connections
9
Q
RJ48c
A
identical to RJ45 but is used for specific WAN connections such as a T1 line, and is wired differently
10
Q
Twisted pair
A
supports a wide variety of fast, modern network standards
11
Q
Facts about twisted pair
A
- 2 wires cay data signals ( 1 conductor carries positive signal other carries negative)
- PVC or plenum plastic insulation surrounds each wire
- Plenum is used when wiring above ceiling tile (fire resistant & non toxic)
- PVC can’t be used above ceiling ( toxic when burned)
- 2 wires are twisted to reduce EMI and crosstalk (since wires are twisted EMI affects both wires equally and should be cancelled out)
- Can be classified by the outer sheath as STP or UTP
- STP ha a grounded outer copper shield around the bundle of twisted pairs and around each pair that provides added protection against EMI
- UTP doesn’t have a grounded outer copper shield. (they are easier to work with and less expensive than shielded cables)
12
Q
Coaxial cable Facts
A
- Older technology that is usually implemented with a bus topology.
- Not suitable for ring or star because the ends of the cable must be terminated.
- It is composed of two conductors that share a common axis within a single cable
13
Q
Coaxial cable components
A
- Two concentric metallic conductors
- inner conductor carries data signal(made of copper or cooper coated tin).
- mesh connector is second physical channel that also grounds the cable. (made of aluminum or cct)
- Insulator that surrounds the inner conductor that keeps the signal separated from the mesh conductor (made of PVC plastic)
- A mesh conductor that surrounds the insulator and grounds the cable. (made of aluminum or cct)
- Cable encasement that surrounds and protects the wire ( made of PVC plastic)
14
Q
Coaxial advantages
A
- Highly resistant to EMI
* Highly resistant to physical damage
15
Q
Coaxial disadvantages
A
- More expensive than UTP
- Inflexible construction ( more difficult to install)
- Unsupported by newer networking standards
16
Q
RG-58
A
- 10Base2 Ethernet networking (also called thinnet)
* Resistance Rating: 50 ohms
17
Q
RG-59
A
- Cable TV and cable networking
* Resistance Rating: 75 ohms
18
Q
RG-6
A
- Cable TV, satellite TV, and cable networking
- less signal loss than RG-59 better choice for networking application especially when longer distance are involved
- Resistance Rating: 75 ohms
19
Q
RG-8
A
- 10Base5 Ethernet networking (also called Thicknet)
* Resistance Rating: 50 ohms
20
Q
F - Type
A
- Twisted onto the cable
- Used to create cable and satellite TV connections
- Used to connect a cable modem to a broadband cable connection
21
Q
BNC
A
- Molded onto the cable
* Used in 10Base2 Ethernet networks
22
Q
AUI
A
- Is a DB15 serial connector
* Used in 10Base5 Ethernet networks
23
Q
DB25
A
- has 25 pins arranged in two rows (top row 13 lower row 12)
* used for parallel, RS-232 serial, or SCSI aplications
24
Q
Fiber Optic Facts
A
- On strand transmits signal and the other receives
- The core carries the signal (made of plastic or glass)
- Cladding maintains the single in the center of the core as the cable bends
- The sheathing protects the cladding and the core
25
Fiber Optic Advantages
* Totally immune to EMI
* Highly resistance to eavesdropping
* Supports extremely high data transmission rates
* Allows greater cable distances without a repeater
26
Fiber Optic Disadvantages
* Very expensive
* Difficult to work with
* Special training required to attach connectors to cables
27
Single Mode
* Uses lasers
* Data transfers through the core using a single light ray (ray also called a mode)
* Core diameter is around 10 microns
* At distances up to 3km, single mode delivers dat rates up to 10 Gbps.
* Cable lengths can extend a great distance
28
Multimode
* Uses LEDs
* Data transfers through the core using multiple light rays
* Core diameter is around 50 to 100 microns
* At distances of under 2km, it delivers dat rates up to 1 Gbps
* Cable lengths are limited in distance
29
Straight-through cable
Computers connect to the network through a hub or switch with a straight through cable. There are two standards for creating them.
30
ST Connector
10
31
SC Connector
20
32
LC Connector
30
33
MT-RJ Connector
40
34
FC Connector
50
35
Fiber Coupler
60
36
T568A
Pin Order 1-8: GW, G, OW, B, BW, O, BrW, Br
37
T568B
Pin Order 1-8: OW, O, GW, B, BW, G, BrW, Br
38
Crossover Cable
* Computers can directly connect to each other with this cable
* Use T568A in the first connector and T568B in the second connector to create a crossover cable
39
Ethernet specification pins
* Pin 1: Tx+
* Pin 2: Tx-
* Pin 3: Rx+
* Pin 4: Unused
* Pin 5: Unused
* Pin 6: Rx-
* Pin 7: Unused
* Pin 8: Unused
* Tx = transmit signal Rx = receiving signal
40
Demarcation Point (demare)
* When you contract with a local exchange carrier (LEC) for data or telephone services, they install a physical cable and a termination jack onto your premises.
* Demarcation point is the line that marks the boundary between the telco equipment and the private network or telephone system
41
Demarcation Point Facts
* LEC is responsible for all equipment on one side of the demarc and the customer is responsible for equipment on the other side
* demarc is also called minimum point of entry (MPOE) or the end user point of termination (EU-POT)
* Is typically located on the bottom floor of a building, just inside the building. For residential service it is often a small box on the outside of the house
* For business installation it is identified by an orange plastic cover on the wiring component
42
Main Distribution Frame (MDF)
* Main wiring point for a building
* Usually located on bottom floor or basement
* LEC typically installs the demarc to the MDF
43
Intermediate Distribution Frame (IDF)
* Smaller wiring distribution point within a building
* Typically located on each floor directly above the MDF
* Additional IDF's can be added to each floor as necessary
44
Demarc Extension
Extends the demarcation point from its original location to another location within the building
45
Demarc Extension Facts
* Usually consists of a single wire bundle that attaches to the existing demarc and supplies a termination point to a different location
* Might need if your network occupies an upper floor of a building
* Need to place demarc into the IDF on your floor
* You are responsible for installing the extensions
46
Vertical cross connect
* Connects the MDF on the main floor to IDFs on upper floors
| * Cabling runs vertically between the MDF and the IDFs
47
Horizontal cross connect
* Connects IDFs on the same floor
| * Cabling runs horizontally between the IDFs
