1U 19" 4 slot rack mountable E1 multiplexer




E1 Multiplexer with 4 configurable X.21/RS-530/449 data ports.

  • Four DTE devices may be linked  at data rates of 64Kbps to 2048Kbps.
  • Optional SNMP Network Management System
  • Easy to configure
  • In-service diagnostics and network status monitoring
  • Meets all of the E1 specifications including ITU-T G.703, G.704, G.706, G.732, and G.823.


The ETU02-MUX is a 1U 19(23)" 4 slot rack mountable multiplexing solution for Fractional E1 network services. Up to four DTE devices may be linked to this model at data rates of 64Kbps to 2048Kbps. There is also provision for one optional E1 sub-link which will perform drop & insert with user-defined timeslot connections from a PABX or other E1 equipment to E1 network services. The Fractional E1 2 or 4 port multiplexer supports local control and diagnostics via an LCD display and LED status indicators located on the front panel or via a serial console port.These features enable users to easily configure the unit, execute the in-service diagnostics and monitor the network status. The ETU02-MUX provides for optional SNMP Network Management System, which allow the user to remotely control and manage the system via SNMP protocol. This model fully meets all of the E1 specifications including ITU-T G.703, G.704, G.706, G.732, and G.823

E1 multiplexor


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