Contra G.703 64Kbps CESoPSN Unit
(1) DB15 Port + (2) 10/100/1000Base-T Ports + (1) 100/1000Base-X SFP Slot

The PB-TDM1-CONTRA Series enables a Contra-clocked, 64Kbps G.703 circuit to be transported over Ethernet or IP networks. The units are typically deployed in pairs, connecting the Contra clocked CPE across the packet network. Point to multi-point applications are supported with a maximum of 16 slaved devices connecting to a master unit.

For Contra applications requiring low latency operation, comprehensive features are available via the management system to tune the unit’s performance.

PB-TDM1-CONTRA Series Overview


  • Multi-standard TDM pseudowire support: CESoPSN, SATOP, TDM over IP
  • Highly accurate & stable clock recovery
  • Oscillator Performance
    • Hold-over 24hrs 150ppb (typical)
    • Aging per day 10ppb
    • Temperature Stability 12ppb
  • G.823/4 Synchronization levels
  • Contra port
    • 1 port – DB15 (female) connector
    • G.703 64kbps contra
    • Presents as DCE (cables for DTE)
    • ITU G.706
    • Transparent to user signalling
  • Support for Jumbo Packets up to 9,600 bytes on Ethernet ports
  • Port based VLAN, IEEE 802.1Q VLAN including Q-in-Q
  • Link Aggregation Control Protocol (LACP)
  • Ring Protection: MSTP, RSTP, STP
  • SNMP v1, v2c and v3
  • RMON and Syslog
  • Management via CLI, Telnet, SSH, SSL, SNMP, Web GUI
  • Authentication: Radius, TACACS+, IEEE 802.1x
  • IGMP Snooping
  • LLDP
  • IPv6 and IPv4 dual protocols
  • Firmware/Configuration backup/restore via Web/FTP
  • TDM packets can be assigned IP Diffserv (DSCP) or ToS and IEEE 802.1p CoS values
  • Supports full IEEE 802.1Q tagging & associated IEEE 802.1p CoS prioritization levels
  • All egress packets, including TDM links, can be prioritized across four output queues
  • Various clocking options for different network types & clock recovery requirements
  • Quality of Service: Supports 8 hardware queues with strict priority and WRR, shaping, policing. Per port bandwidth management.


  • Contra

PB-TDM1-CONTRA Series Tech Specs


  • IEEE 802.3
  • IEEE 802.3u
  • IEEE 802.3z
  • IEEE 802.3ab
  • IEEE 802.3x
  • IEEE 802.3ad
  • IEEE 802.1p
  • IEEE 802.1Q
  • IEEE 802.1w
  • IEEE 802.1s
  • IEEE 802.1x
  • IEEE 802.1AB
  • ITU-T G.823/4
  • ITU-T G.703


  • (1) Contra DB15 (female) connector
  • (2) 10/100/1000Base-T RJ-45 ports
  • (1) 100/1000Base-X SFP slot (empty)
  • (1) RJ-12 console port


  • Width: 8.86″ [225 mm]
  • Depth: 7.87” [200 mm]
  • Height: 1.73” [44 mm]

Power Input

  • AC Version
    • Bale lock cable clamp
    • Auto-sensing 100VAC-240VAC, 47-63Hz
    • Max consumption 0.2A @ 230VAC
    • Typical Consumption 18 Watts
  • DC Version
    • External presentation -48VDC, 0VDc and GND via external screw down termination
    • Wide input range -18V to -72V
    • Typical consumption 13 Watts


  • Operating: 0°C to +60°C
  • Humidity: 10% to 90% (non-condensing)


  • 5.73 lbs. [2.6 kg]


  • CE Mark
  • EN60950-1:2006+ A11:2009+ A1:2010+ A12:2011
  • EN50121-4:2006, EN61000-3-2:2006+ A1&A2:2009
  • FCC CFR47 Parts15: 107&109, CB Scheme Certified


  • 1 Year

PB-TDM1-CONTRA Series Downloads

Additional Product Information

Note: Some Documentation may have Transition Networks named or pictured. Transition Networks was acquired by Lantronix in August 2021. Learn more about the acquisition here.

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(1) DB15 port + (2) 10/100/1000Base-T ports + (1) 100/1000Base-X SFP slot (empty) AC input (serial control cable included)

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(1) DB15 port + (2) 10/100/1000Base-T ports + (1) 100/1000Base-X SFP slot (empty) -48VDC input (serial control cable included)

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