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Home Products Interface Converters E1 G.703 Single Modular Port E1 CSU/DSU

Single Modular Port E1 CSU/DSU

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ETU011 Single Modular Port E1 CSU/DSU

ETU011 Single Modular Port E1 CSU/DSU

The ETU011 stand-alone DSU/CSU is a digital access unit for Unframed E1, Fractional E1, or Fractional cascaded E1 service. The ETU01 data channel supports user-selectable transmission rates via randomly selected E1 timeslots, which provides integral multiples of 64kbps, up to a maximum 2.048Mbps (unframed), for a line attenuation of up to 43 dB on twisted pair or coax cable. This provides an approximate operating range up to 2km (using 22AWG). The ETU01 packs the data channels into the E1 link in user-selected time slots. The unused time slots can insert IDLE code (in frame mode).

Single Modular Port E1 CSU/DSU schematic


  • Supports Fractional E1 and Unframed E1 service with EOC control
  • Removable interfaces, support V35, X21, RS530, RS449, RS232, G.703 Co-directional, NRZ, Ethernet Bridge and Router
  • I/O connectors on rear panel
  • Multiple clock source selection
  • (Internal or External: E1 recovery, DTE or DCE)
  • Built-in BERT with V.54 diagnostic capabilities for performing local and remote loopback


G.703 E1

Framing: Framed CCS (PCM31) CAS (PCM30) / Unframed CRC4 on/off
Line Code: AMI/ HDB3
Relative receive level: 0 to -43dB
Transmit level:

  • Pulse Nominal: 2.37V ±10% for 75ohm
  • Amplitude Nominal: 3.00V ±10% for 120ohm, Zero amplitude ±0.1V

Jitter performance: According to ITU-T G.823
Connectors: BNC(unbalanced), RJ-48(balanced)
Clock modes:

  • Clock mode 0 Receive & transmit clock (DCE1) (recovered) to the sync. DTE
  • Clock mode 1 Receive & transmit clock (DCE2) (internal oscillator) to the sync. DTE
  • Clock mode 2 Receive clock to the sync. and transmit (DTE1) clock from the sync. device
  • Clock mode 3 Receive and transmit clock from the (DTE2) sync. DCE (from ETC and ERC pin)
  • Clock mode 4 Receive and transmit clock from the (DTE3) sync. DCE (all from ETC pin)

Test Switches: Digital local loopback, Analog local
Diagnostics: Digital local and remote loopback, Analog local loopback, Test pattern
Indications: LEDs (Power, TD, RD, RTS, DCD, Singal loss, Sync loss, Alarm)
Standard: ITU-T G.703, G.704, G.706 and G.732
Power Input: AC: 90~250VAC, DC: 18-72 VCD
Power Consumption: 10W
Dimensions: 250 x 195 x 45mm (D x W x H)
Weight: 510g
Temperature: 0~50°C (Operating) ,-10~70°C (Storage)
Humidity: 10~90% non-condensing
Certification: CE, FCC, RoHS
MTBF: 57,000 hrs (25°C)