RFL Communications 21 Sub-MUX Manual do Utilizador descarregar pdf (Página 32)

Solutions for an evolving world.

TX/RX

Protective Relay

TX/RX

MUX or

Channel

Bank

MUX or

Channel

Bank

Electrical,

µwave Radio

or Fiber

RX/TX

Direct via

Leased

POT lines

Audio Tone Connections,

Relay to Relay

Relay to MUX

• Analog phone lines are still used for many application, where

this is the only means of communication available. i.e. Utility to

Co-Gen…

• These lines can be 2-wire or 4-wire connections. In 2-wire all

information TX and RX is send and received over 2 wires. In 4-

wire there will be 2-pairs TX and RX. (never shall the two meet)

• Typically TX and RX will be cross-connected.

• There may be a direct wire connection via the local phone

company, or private network. Additionally, the 2/4wire

connection may use a MUX channel, and the connection will

be to a 2/4-wire E&M module w/RJ11 or terminal block

connection to the rear interface of the MUX chassis

• This form can be determined by the type of connections on the

equipment chassis or, If it terminates into a TELCO Punch down

block or a MUX chassis.

• Testing of the relay can be done via looping at any of the TX/RX

connections .

• In most cases Addressing is not required for security, if used

over a leased line, but may be required over a MUX channels. If

used, it will need to be disabled during loop testing.

2-wire

4-wire

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RFL Communications 21 Sub-MUX Manual do Utilizador Página 32