Media5 Mediatrix 3308, Руководство по установке оборудования

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RJ-11 (Telephone) Cable Hardware Installation Guide
Mediatrix 3300 – Analog Gateway 37
Crossover Cable
A RJ-45 crossover cable is used when only two systems are to be connected to each other, peer to peer, at
the Ethernet Cards by “crossing over” (reversing) their respective pin contacts. An example would be
connecting two computers together to create a network. The crossover eliminates the need for a hub when
connecting two computers. A crossover cable may also be required when connecting a hub to a hub, or a
transceiver to transceiver or repeater to repeater. When connecting a hub to a transceiver, a straight through
cable is always used.
A crossover cable is sometimes called a null modem. The coloured wires at either end are put into different
pin numbers, or crossed over.
Figure 15: Crossover Connectivity
RJ-11 (Telephone) Cable
The RJ-11 cable is commonly used for telephone connection.
Wiring Conventions
For telephone connections, a cable requires one pair of wires. Each wire is identified by different colours. For
instance, one wire might be red and the other, red with white stripes. Also, an RJ-11 connector must be
attached to both ends of the cable.
Each wire pair must be attached to the RJ-11 connectors in a specific orientation. The following figure
illustrates how the pins on the RJ-11 connector are numbered. Be sure to hold the connectors in the same
orientation when attaching the wires to the pins.
Figure 16: RJ-11 Connector Pin Numbers
Note:
This is not an IEEE supported configuration and should be used for test purposes only.
1- TX+
2- TX-
3- RC+
6- RC-
TX+ -1
TX- -2
RC+ -3
RC- -6
Caution:
Do not plug a phone jack connector into an RJ-45 port.
Table 18: RJ-11 Pinout Information
Pin # Function
1 Not used
2 Not used
3 Ring
4 Tip