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Home Products Interface Converters E1 G.703 E1/T1 Cross Rate Converter

E1/T1 Cross Rate Converter

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E1/T1 Cross Rate Converter

E1/T1 Cross Rate Converter

The FRM220-FTEC is a slide-in card E1/T1 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 internal DIP switch settings or via the RS-232 console port and ASCII terminal. Tests and diagnostics can easily be performed from the front panel push button switches.  Diagnostics include T1 local/remote and E1 local/remote loop back.

E1/T1 Cross Rate Converter schematic


  • Converts between T1 and E1 data and signaling
  • Enable equipment to operate at T1 and E1 rates
  • Support G.802 Annex B
  • 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


E1 interface

Framing: CAS/PCM30 or CCS/PCM31 selectable
Bit rate: 2.048Mbps
Line Code: HDB3
Line Impedance: 75 ohm (BNC) / 120 ohm (RJ-45); Voice channel sample rule A-Law
CRC check: CRC-4 enable/disable
Pulse amplitude: Nominal 2.37V ±10% for 75ohm, Nominal 3.00V ±10% for 120ohm
Zero amplitude: ±0.1V
Connector: RJ-45 and BNC pair

T1 interface

Framing: D4, ESF selectable
Bit rate: 1.544Mbps
Line Code: B8ZS / AMI
Equalization: 0 ~655 feet settable; Voice channel sample rule u-Law
CRC check: CRC-6 when ESF
Line Impedance: 100 ohms
Transmit Pulse level: 3.0V ±10%
Receive signal level: 0 ~-10dB
Connector: RJ-45 and Bantam Jacks

Indications: Power Alarm
Standard: ITU-T G.703, G.704, G.706, G.823, G.824, ANSI T1.403
Power Input: AC: 100~240VAC, DC24: -18 ~36VDC, DC48: -36 ~72VDC
Power Consumption: 15W
Dimensions: 160 x 88 x 24mm (D x W x H)
Weight: 280g
Temperature: 0~60°C (Operating), 10~70°C (Storage)
Humidity: 10~90% non-condensing
Certification: CE, FCC, RoHS
MTBF: 57,000 hrs (25°C)