Detailed explanation of various technical parameters of telephone mux

Time : Aug. 10, 2022    View : 88

Nowadays, with the rapid development of communication network technology, the application range of telephone optical multiplexer is becoming wider and wider. In the process of using telephone optical multiplexer, we must first understand the telephone optical multiplexer, such as various parameter settings of the telephone optical multiplexer, etc. Wait, only by clearly understanding the telephone optical transceiver, we can better use the telephone optical mux. Next, the editor of Feichang Technology will take you to learn more about the technical parameters of the telephone optical mux? Let’s take a look!


Technical parameters of telephone optical mux


  1. E1 interface:

Bit rate: 2.048Mbit/s ±50ppm

Reference standard: ITU-T G.703, G.704, G.712

Line code: HDB3

Jitter characteristics: ITU-T G.823

Interface impedance: 75Ω (optional 120Ω)

Physical interface: BNC (RJ45)


  1. User and loop interface:

Impedance: 600Ω

Insertion loss: -3±0.75dB

Frequency characteristics: 300~3400Hz (-0.6~+3dB)

Crosstalk attenuation: ≥65dB

Physical interface: RJ11


  1. Two/four wire audio interface:

Impedance: 200Ω+680Ω||0.1μF

Four-wire AD gain: 14dB (adjustable)

Four-wire DA gain: -2 dB (adjustable)

Four-wire AD frequency characteristics: -0.2 – +0.2dB

Four-wire DA frequency characteristics: -0.2 – +0.2dB

Second-line AD frequency characteristics: -0.2 – +0.2dB

Second-line DA frequency characteristics: -0.2 – +0.2dB (adjustable)

Return loss: 40dB

Balance: 70dB

Common mode rejection ratio: 70dB

Power supply rejection ratio: 30dB

Idle channel noise: ≥65dB

Ring resistance: 600Ω


  1. Ethernet interface:

Support IEEE 802.3/802.3u, IEEE 802.1Q (VLAN)

Interface rate: 10/100M adaptive

Full duplex, half duplex fully adaptive

Support cross-line straight-through line adaptation


  1. Physical interface: RJ45 seat

        RS232/V.24 interface:

Electrical Characteristics: Compliant with CCITT V.28 protocol

Transmission rate: asynchronous ≤ 19200bps


  1. Size:

19-inch 1U standard chassis:



  1. Power supply:

        Input: AC 220V DC-48V

        Power consumption: ≤10W static