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The FRM220-FTEC is a slide-in card T1 (US Standard), E1 (European Standard) converter and timeslot cross connect which enables conversion between one T1 signal and one E1 signal. T1 and E1 signals with frames employ u-Law and A-Law compander encoding principles respectively and encode those analog signals into 64kbits digital data. The E1 interface supports CCS (PCM31) or CAS (PCM30) frames with or without CRC-4 and with HDB3 line coding. The T1 interface supports D4 or ESF frame formats with B8ZS or AMI line code. Multiple clock source selection provides maximum flexibility in connecting both T1 and E1. The clock source may be from the T1 recovery clock, from the E1 recovery clock, from the internal oscillator, from an external clock or via transparent timing. All setup controls can be performed via FRM220 CH01M RS-232 console port and ASCII terminal. Tests and diagnostics can easily be performed. Diagnostics include T1 local/remote and E1 local/remote loop back. When FRM220-FTEC card in placed in the FRM220 chassis, SNMP management allows veiwing the card converter's status, type, link status, data link status and alarms.

Data Sheet


  • Converts between T1 and E1 data and signaling
  • Enable equipment to operate at T1 and E1 rates
  • Support G.802 Annex B (T1 over E1)
  • Configures A-law/μ-law and signaling conversion
  • Transparent conversion at 64kbps timeslot level
  • Controlled slip for buffer over or under flow
  • 24 timeslots of T1 Nx64 can be inserted into E1 Nx64, 30/CAS or 31/CCS timeslots

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