TDM Digital Switch E1

Telephone digital switching system with support up to 16 E1 ports and signaling conversion function


  • up to 16 E1 interfaces
  • SS7, PRI (DSS1, QSIG, Q.931), V5.2, R2 MFC, R1.5
  • full accessible commutation 16 E1
  • remote TCP/IP access for configuration and monitoring
  • configurable from 2 E1 ports to 16 E1 ports depending on user requirements
  • reduce access costs by combining partially loaded E1s to a single E1


Terratel telephone digital switching system supports SS7, ISDN PRI, V5.2, R2 CAS, R2 MFC, R1.5 signaling types simultaneously, which makes it the best solution for building and upgrading PSTN and corporate communications networks.

TDM digital switch, Protocol and signaling converter, E1 PCM Multiplexer - Application Diagram

Pic 1. TDM Digital Switch E1 Application Diagram

Telephone digital switching system provides:

  • Protocol and signalling converter functionality
  • E1 PCM Multiplexer functionality
  • full-service switching of 16 E1 / PCM30 ports
  • Converting signalling protocols of PCM30 digital ports
  • dividing E1 port into channels
  • visual monitoring of how system information flows in signal channels

The E1 digital links switch supports the following signaling protocols:

  • SS7 (supporting subsystem MTP2, MTP3, ISUP)
  • ISDN PRI (DSS1, QSIG, Q.931)
  • V5.2
  • R2 MFC
  • R1.5

Additional Features

  • assigning signaling protocols for each E1 ports (or part of E1 ports)
  • redirecting links depending on the subscriber number
  • converting the subscriber number when the connection is being established
  • combining several PBX into a corporate network with internal dialing plan
  • changing numbers based on assigned masks

Information Support

  • monitoring the connection process over all channels
  • detailed monitoring of all connection stages over the dedicated group of channels
  • monitoring line and register signals when CAS or R2 signaling is used
  • monitoring the signaling system data with the dedicated signal channel (SS7, DSS1, V5.2)

Signalling converter or E1 PCM Multiplexer

You can use signalling converter or E1 PCM Multiplexer for connection between multiple switching equipment (telephony exchange, PBX, equipment with Internet access, IP-PBX, IP-telephony gateways, etc.) and types of signalling:

  • SS7 — DSS1 or DSS1 — SS7
  • CAS — SS7 or SS7 — CAS (R1,5 — decade code)
  • SS7 — R2 or R2 — SS7
  • SS7 — V5.2 or V5.2 — SS7
  • CAS — DSS1 or DSS1 — CAS
  • R2 — DSS1 or DSS1 — R2
  • SIP — SS7, DSS1, V5.2, R2 CAS, R1.5

Design and Management

Technically, the product is designed as a dedicated industrial controller based on the state-of-the-art telecommunications processor. The Signaling Converter is designed to be installed in a server closet 19″ rack with 1U height of the housing.

Monitoring and control (changing configuration, monitoring operation etc.) are performed locally (RS-232 interface, COM1 port) or over Ethernet (TCP/IP).

Monitoring the operation of the device and reporting of accidents is carried out using the SNMP protocol.

Electrical power supply

The power is supplied from the DC source operating within from -36V to 72V range or from the AC source operating within from -90V to 265V range.

AC/DC redundancy power supply support. Power redundancy can be provided by installing two power sources that are operated concurrently with various configurations: AC 220V+AC 220V, AC 220V+ DC 48V/ DC 60V or DC 48V/60V+DC48V/60V.

Technical Specifications

Network Interfaces
TDM up to 16E1 interfaces
Management Fast Ethernet, RS-232
Signaling Protocols
PSTN SS7, ISDN PRI, V5.2, R2 CAS, R2 MFC, R1.5
Rated voltage 220V or 48V/60V
Power consumption up to 20W
Operating Environment
Operating temperature from 0°С to +60°С
Humidity up to 80% at +25°С
System Type Board
Dimensions 1U high, 19″ wide rack mountable