30Voice+FE over E1 PCM Multiplexer

This PCM multiplexer provides E1 access, 1~30 channels voice outputs, and 1-channel 64Kbps ethernet optional (or 29chs voice + 128Kbps ethernet). The electricity part is a digital circuit.

The superiority of this PCM multiplexer is reliable work and stability with high integration and lower energy consumption. Its small size is easy for installation and maintenance. Most clients of telecom operators rent E1 lines for ethernet networking, while this PCM multiplexer could supply more telephone lines on E1 and free calls between the head office and branch.

photos of pcm multiplexer

● Based on self-copyright IC;

● The PCM multiplexer can monitor the remote alarm status;

● E1 interface complies with G.703 and adopts digital clock recovery and smooth phase-lock technology;

● It supports FXO/FXS, EM2/4 audio, Magnet Telephone Interface, FXO port docking with program-controlled switchboard, FXS port connected to the user’s telephone;

● It provides 4 expansion interfaces, which can be extended from 1 to 4 asynchronous data, such as RS232/485/422/Manchester codes; Or 1 to 8 channels dry contact interface;

● Ethernet interface rate is 10/100M, duplex/half duplex adaptive;

● 1~30 Channel voice access, supports caller ID feature and reverse polarity billing functions;

● It supports various sites’ mutual number allocation function;

● It can detect the end device is power-off or the E1 line is broken when they lose signal, through the LED indicates alarm;

● It provides 2 clock types: E1 master clock and E1 line clock;

● This PCM multiplexer has three Loop Back Mode: E1 interface Loop Back (ANA)、Ethernet interface Loop Back(DIG)、Command the remote Ethernet interface Loop Back(REM);

● This PCM multiplexer has a PATT function, easy for opening lines, and can use as an E1 bit-error tester;

● E1 can support N * 64k (N = 1-32) rate, which means the rate is adjustable from 64K-2048K

● With the Console interface, Can display the local and remote equipment status

● It supports 6U 13 slots rack plug-in, can realize centralized SNMP, 1U type can equipment with independent SNMP;

● Multiple power mode options: AC220V, DC-48V/DC24V and so on;

● Telephone interface with lightning protection, lightning reached IEC61000-4-5,Short circuit current wave 8/20μs,open-peak output voltage 6KV standards.

● E1 Interface

 Interface Standard: comply with protocol G.703;
 Interface Rate: n*64Kbps±50ppm;
 Interface Code: HDB3;

 E1 Impedance: 75Ω (unbalance), 120Ω (balance);

 Jitter tolerance: In accord with protocol G.742 and G.823

 Allowed Attenuation: 0~6dBm

● FXS Phone Interface

Ring voltage: 75V

Ring frequency: 25HZ

Two-line  Impedance: 600 Ohm (pick up)

Return loss: 40 dB

● FXO Switch Interface

Ring detect voltage:  35V

Ring detection frequency:     17HZ-60HZ

Two-line  Impedance:     600 Ohm (pick up)

Return loss:  40 dB

● EM 2/4 Line

AD: 0dB

DA: 0dB

Two/Four-line  Impedance: 600 Ohm

Return loss: 20 dB

● Ethernet Interface (10/100M)

Interface Rate: 10/100 Mbps, half/full duplex auto-negotiation

Interface Standard: Compatible with IEEE 802.3, IEEE 802.1Q (VLAN)

MAC Address Capability: 4096

Connector: RJ45, support Auto-MDIX

● Working Environment

Working Temperature: -10°C ~ 50°C

Working Humidity: 5%~95 % (no condensation)

Storage Temperature: -40°C ~ 80°C

Storage Humidity: 5%~95 % (no condensation)

application 1 of pcm multiplexer

Typical solution 1——- Ordinary voice Access

application 2 of pcm multiplexer

Typical solution 2——- Hotline Access

application of 30ch voice over e1 pcm multiplexer