1U 19" 4 slot rack mountable E1 multiplexer


  • Four DTE devices may be linked  at data rates of 64Kbps to 2048Kbps.
  • Optional SNMP Network Management System, which allow the user to remotely control and manage the system via SNMP protocol.
  • Easy to configure the unit, execute the in-service diagnostics and monitor the network status.
  • Meets all of the E1 specifications including ITU-T G.703, G.704, G.706, G.732, and G.823.


Item Description
E1 and Sub-E1

Framing: Unframed / Framed CCS(PCM31)
Framed: CAS(PCM30)
Bit rate: 2.048Mbps±0 ppm
Line code: AMI / HDB3
Line impedance: 75 ohm (BNC) / 120 ohm (DB-15, RJ-45)

Transmitter level

Relative receive level: 0 to -43dB
Pulse: Nominal 2.37V ±10% for 75ohm
Amplitude: Nominal 3.00V ±10% for 120ohm
Zero amplitude: ±0.1V
Transmit frequency: Internal timing±100 ppm
Tracking: Recovery timing±100 ppm
External timing: ±100 ppm
Jitter performance: According to ITU-T G.823
Return loss: 12dB for 51 ~ 102KHz
18dB for 102 ~ 2048KHz,
14dB for 2048 ~ 3072KHz
Interface connector: 15-pin D-type F, BNC

User Data Channel

Data rate: Nx56Kbps or Nx64Kbps
Control signals: CTS constantly on DSR constantly on, except during test loops DCD constantly on or follows RTS, except during signal loss
Loopback: Line, Payload, local, DTE loopback
User Data Channel BERT Test Patterns: 511, 2047, 2e15-1, 2e20-1, QRSS, 2e23-1, All 1, All 0, Alt, 0011, 3 in 24, 1 in 16, 1 in 8,1 in 4 test pattern.

Key Pad

4 operation keys


16 x 2 character backlit LCD


Signal loss, Sync loss, Alarm (AIS, MRAI, RAI), TD, RD, Error, Test


ITU-T G.703/G.704/G.706, G.732 & G823

Power Input

AC: 90 ~250V,
DC24: -18 ~-36VDC, DC48: -36 ~-72VDC

Power / Consumption


Dimensions / Weight

235 x 438 x 45mm (D x W x H) / 2.9kg


0~50°C (Operating), -10~70°C (Storage)


10~90% non-condensing




57,000 hrs

Ordering Information

Order Code Description
CT-ETU02-MUX4-AC 4 data ports AC power
CT-ETU02-MUX4-DC 4 data ports DC power
CT-ETU02-MUX4-AD 4 data ports AC+DC power
CT-ETU02-MUX2-AC 2 data ports AC power

More Information