Network Terminating Unit


  • Network Terminating Unit for carriers and SME users, which offers three model choices with G.703 E1 or ITU-T V.35 and X.21 data interface.
  • Supports two different connectors for G.703 E1 applications that link to TDM services, either by balanced 120 ohm RJ45 jack (USOC RJ48C) or unbalanced 75 ohm dual BNCs, with bit rates from 64kbps to 2.048Mbps
  • SHDSL V.35, X.21 NTU supports a serial interface via DB25F connector along with DB25M to MB34F(V.35), DB25M to DB15F(X.21) cable adapters.
  • Provides the capability to extend transmissions over a copper loop such as ordinary, single pair, telephone twisted cable.
  • Standard G.SHDSL (ITU G.991.2) supports improved reach/speed and greater interoperability
  • Fast and cost-effective provisioning of traditional frame relay (FR or T-HDLC) or TDM leased line services
  • Use existing copper loop infrastructures
  • Operate in back to back connection
  • Efficient single wire pair usage
  • Up to 5.696Mbps symmetric service bit rate
  • Auto rate installation maximizes data rate based on loop conditions
  • Bandwidth guaranteed transmission equipment
  • Raw and per time interval statistics
  • SHDSL Line performance monitoring (Data Rate and SNR)


Item Description
WAN Interface

Line Rate: SHDSL per G.991.2
Coding: trellis coded pulse amplitude modulation(TCPAM-16)
Support: Annex A(ANSI) and Annex B(ETSI)
Payload rates: 192kbps to 5.696Mbps (N x 64kbps, N=1 to 36)
Connection: RJ-45 jack
Impedance: 135 ohms

G.703 Interface (E1)

Connection: RJ-48C for balanced 120Ω E1 cable and
BNC for unbalanced 75Ω E1 cable
Line Rate : 2048KHz +/- 50ppm
Line coding: HDB3/AMI
Framing :PCM30/PCM30C/PCM31/PCM31C and Unframed
Data Rate : 64Kbps to 2.048Mbps (Nx64Kbps, N=1 to 32)
Operation : Full E1 and Fractional E1

Data Interface (V.35, X.21)

Payload rates: 64~5.696Mbps (N=1 to 36)
Support V.35, X.21

DSL Timing

From E1 Recovery (as E1)

Performance Monitoring

ES, SES, UAS for E1
Alarms and Errors for SHDSL or interface


Configuration with keypads and LCD display
Console port (RJ45, RS232C)
Support firmware upgradeable
SNMP management via Ethernet port(Optional)

Loopback Tests (for E1 only)

Local Digital Loopback
Local Loopback
Remote Line Loopback
Remote Payload Loopback
Far-end Line Loopback
Far-end Payload Loopback
V.54 Loopback(For V.35 interface only)
Build-in 2047 bit (2 11 -1) BER Tester


ISO 9001 Quality Management
CE Approval & EN60950 Certificate

Physical / Electrical

Dimensions: 195 x 48 x 168 mm (D x W x H)
AC Input: 90~240VAC with 50~60Hz
DC Input: -36V~ -72V
Power Consumption: 10W Max
Operation temperature: 0 to 50°C
Humidity: Up to 95% (non-condensing)
External screw for frame grounding

Ordering Information

Order Code Description
CT-SHDTU03B-E1-AD E1 NTU, AC+DC Power (2-wire 5.7Mbps)
CT-SHDTU03B-V35-AD V.35 TDM NTU, AC+DC Power w/V.35 Cable (2-wire 5.7Mbps)
CT-SHDTU03B-X21-AD X.21 TDM NTU, AC+DC Power w/X.21 Cable (2-wire 5.7Mbps)

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