Telesis PX24 IP PBX Business Phone System
Design and manufacture IP PBX Business Phone System, Switching System, VoIP Gateway, and Signaling Converter  

E1 Interfaces


Telesis Systems Offering E1 Interfaces

  • Telesis Business Phone Systems:
    • PX24X Hybrid IP PBX Business Phone System
  • Telesis Switching Systems:
    • X1 Large Capacity TDM - IP Telephony Switch
  • Combined VoIP Gateway and Signaling Converters:
    • Stillink 200
    • Stillink 800
    • Stillink 3200
  • Large Capacity IP PBX for Enterprises
    • Stillink 3200

Technical Specifications

The 2.048 Mbit E1 digital interfaces can connect to 120 ohm balanced terminations. The clock of a Telesis system can be programmed to synchronize with any of the E1 interfaces that may be present in the system or it may run freely. The line code is programmable as AMI or HDB3. Cyclic redundancy check (CRC4) can be enabled or disabled for each E1 interface individually. The direction of each channel of every E1 present in the system can be programmed as incoming, outgoing, bothway, or unavailable and therefore may yield fractional E1 connections.

E1 interfaces in Telesis systems

Telesis systems have E1 interfaces to connect to PSTN and private network. E1 interfaces support numerous protocols and signaling types

Signaling on 2.048 Mbit E1 (ITU-T G.703) interfaces

  • Channel-Associated Signaling (CAS)
    • Single-bit E&M emulation
    • Two-bit ITU-T R1
    • Two-bit ITU-T R2
    • Many variations of signaling types (such as CL-1B, OCL-1B, TCL-1B, CL-1VF, OCL-1VF, TCL-1VF, SL/ZSL, SLM) widely employed in CIS countries
  • Common-Channel Signaling (CCS)
    • DSS1 (Euro-ISDN in the TE direction)
    • DSS1 (Euro-ISDN in the NT direction)
    • ECMA QSIG (in the TE direction)
    • ECMA QSIG (in the NT direction)
    • ITU-T Signaling System No.7 ISUP
    • V5.2 LE and AN protocol

Related Readings

We recommend you to visit Telesis WiKi Pages for technical readings.


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