Chapter 1 Introduction
1.7.22 FRM220-FTEC E1/T1 Cross Rate Converter Card
The FRM220-FTEC is a 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 framing employ u-Law and A-Law compander encoding principles respectively and encode
those analog (voice) signals into 64kbits digital data.
The T1 interface supports D4(SF) or ESF frame formats with B8ZS or AMI line code. The E1 interface supports
CCS (PCM31) or CAS (PCM30) framing without CRC-4 and framing with CRC-4. The line coding is HDB3.
Tests and diagnostics can easily be performed from the local console interface or via Web based management of
the FRM220. Diagnostics include T1 local/remote and E1 local/remote loop back.
Features
• 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/u-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
Specifications
T1 Interface Specifications
• Complies with: ITU-T G.703 Recommendation
• Bit rate: 1.544Mbps
• Frame format: D4(SF) or ESF selectable
• Line code: AMI or B8ZS selectable
• Equalization: 0-655 feet settable
• Voice channel sample rule: u-Law
• CRC check: CRC-6 (when ESF)
• Impedance: 100 Ohm balanced
• Transmit pulse level: +/-3.0V (10%)
• Receive signal level: 0 to –36dB
• RJ-45 Connector USOC RJ-48C
E1 Interface Specifications
• Complies with: ITU-T G.703 Recommendation
• Bit rate: 2.048Mbps
• Frame format: CAS (PCM30) or CCS (PCM31)
• Line code: HDB3
• Voice channel sample rule: A-Law
• CRC check: CRC-4 enable/disable
• Impedance: 75 Ohm or 120 Ohm selectable
• Transmit pulse level: 75 Ohm +/-2.37V (10%)
•
Impedance: 120 Ohm +/-3.0V (10%)
• Receive signal level: 0 to –30dB
• RJ-45 Connector USOC RJ-48C
• BNC via RJ-45 to 2xBNC adapter cable
Timeslot mapping selectable
• E1 CAS mode: TS1-TS15, TS17-TS31 any 24 timeslots
• E1 CCS mode: TS1-TS31 any 24 timeslots
This product includes the following models:
FRM220-FTEC E1/T1 Cross Rate Converter Card
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