FTEC - G.703/G.704 (E1) to G703/G.704 (T1) Converter


  • Model No. : G703/FTEC-110(AC110v)
  • Model No. : G703/FTEC-220(AC220v)
  • Model No. : G703/FTEC-48 (DC -48v)


The G.703-FTEC is a T1/E1 converter and timeslot cross connect which enables conversion between one T1 signal and one E1 signal. Tests and diagnostics can easily be performed from the front panel push-switches. Diagnostics include T1 local/ remote and E1 local/remote loop back.

The T1 interface complies with ANSI T1.403, and AT&T TR-62411 standards, and supports both D4 or ESF frame formats with B8ZS or AMI line code. The E1 interface complies with ITU G.703, G.704, G.732, and G.823 standards, and supports both 2 and 16 frames per multiframe without CRC-4 and framing with CRC-4. The line code is HDB3.

All setup controls are performed via internal DIP switch settings.


  • Support G.802 Annex B
  • Enables equipment to operate at T1 and E1 rates.
  • converts between T1 and E1 data and signaling.
  • Configurable A-law / µ-law signaling conversion.
  • Transparent conversion at 64kbps timeslot level.
  • Controlled slip for buffer over/underflow.
  • The 24 timeslots of T1(nx64) can be inserted into E1(nx64), 30/CAS or 31/CCS timeslots.
  • Local/remote loopback test capabilities on both T1 and E1 interface.
  • Complies with CCITT G.703, G.704, G.823 recommendations.
  • Function setting via internal DIP switch setting or Console Port.
  • Timing selectors:
  • Transparent timing,
  • T1/E1 recovery timing
  • Internal timing
  • (1.544Mbps/2.048Mbps)
  • External timing
  • (1.544Mbps/2.048Mbps).

Interface Specifications

T1 Interface :

 Complies  ANSI T1.403;  ITU G.703
 Bit rate  1.544Mbps
 Line code  AMI or B8ZS selectable
 Frame format  D4 or ESF selectable
 Equalization  0-655 feet settable
 Voice channel sample rule    µ-Law
 CRC check  CRC-6(when ESF)
 Impedance  100 ohm balanced
 Transmit pulse level  3.0V (±10%)
Receive signal level  0 to -36dB
 Connectors  DB15/ Bantam jack

E1 Interface:

 Complies  ITU G.703
 Bit rate  2.048Mbps
 Line code  HDB3
 Frame format  CAS/PCM30 orCCS/PCM31 selectable
 Voice channel sample rule    A-Law
 CRC check  CRC-4enable/disable
 Impedance  75 ohm or 120 ohmselectable
 Transmit pulse level  75 ohm 2.37V (±10%)120 ohm 3.0V (±10%)
 Receive signal level  0 to -30dB
 Connectors  DB15/ BNC


Timeslot Mapping Selectable

E1/CAS mode:

  • TS1-TS15, TS17-TS31, any 24 timeslots.

E1/CCS mode:

  • TS1-TS31, any 24 timeslots.

Timing Source

  • Internal timing 1544 or 2048KHz ±50 ppm
  • Transparent
  • Loopback timing
  • E1 recovery timing
  • T1 recovery timing
  • External 2048KHz
  • External 1544KHz

Elastic buffer

  • Buffer length:
  • ±2 T1 Frames
  • Underflow:
  • A frame of data was repeated
  • Overflow:
  • A frame of data was deleted

Unconnected Codes

  • FF Hex code on unused timeslots

Alarm Responses

  • Received impairment on E1:
  • Loss Of Signal
  • Transmitted response on E1:
  • Remote Alarm Indication (RAI)
  • Transmitted response on T1 :
  • Yellow Alarm
  • Received impairment on T1:
  • Loss Of Signal
  • Transmitted response on T1:
  • Yellow alarm
  • Transmitted response on T1:
  • Yellow Alarm Indication (RAI)

Diagnostic Tests

  • T1 Local loopback
  • T1 Remote Control loopback
  • E1 Local loopback
  • E1 Remote Control loopback
  • Indicators
  • Power
  • Failure

LED indicators for both T1 and E1

  • Signal Loss
  • Frame Loss
  • BPV
  • AIS
  • Slip
  • Yellow Alarm
  • Loop Test

Power Source

  • AC110V or 220V
  • DC-48V


  • Dimension :26(L)*19.5(W)*4.4(H)cm
  • 101/4(L)*75/8(W)*13/4(H)in.
  • Weight: 1.5Kg(3.3 lb)net weight


  • Temperature: 0-500C (32-1250F)
  • Humidity: Up to 90% Non-condensing
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