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|  8 T1 and 16 T1 over Ethernet Multiplexer (TDMoIP) |

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Comarra's 8 T1 and 16 T1 over Ethernet multiplexer (TDM over IP / TDM over IP) product is used to provides 8 T1 or 16 T1 communication channels over Ethernet or IP networks. This product transmits information at T1 (1.544Mbps). The equipment supports point-to-point and point-to-multi-point applications.

To transport T1 channels over an Ethernet or an IP network and to accelerate traditional telecom services to migrate to the IP packet networking technology, the -8/16T1 over Ethernet multiplexer product uses TDM over IP technology. This solution transports the legacy T1 data through the existing Ethernet or IP network.

8 T1 and 16 T1 over Ethernet multiplexer (TDM over IP) - Product Brochure (PDF)

The 8/16T1 over Ethernet multiplexer product is the new generation of the TDM over IP equipment with IP circuit emulation that supports transportation of upto 8 T1 / 16 T1 and 5 GE electrical ports over an Ethernet or an IP network. The uplink Ethernet ports and user data port are IEEE 802.3 compliant, 10/100BaseT auto-sensed ports.

The 8/16 x T1 over Ethernet can be used to emulate transparent T1 channels over an Ethernet link with an acceptable QoS (Please see the note: QOS, below), so that a majority of the existing T1 based applications can be readily setup over Ethernet LANs and WANs.

(Note: QoS shall depend on the quality of the Ethernet link and packet losses).


  • Provides 8T1 and 16T1 ports (available in 1T1, 2T1, 8T1 and 16T1 versions)

  • Supports point-to-point and point-to-multi-point applications

  • Provides 5 GE electrical ports and 1 GE optical ports

  • User-friendly web server supported for easy setup and maintenance, Alarm logs provided

  • Supports Ethernet spanning tree protocol which enables work and protection in ring and mesh topology

  • Support SNMP V1/V2 Network Management

  • Ethernet built-in layer 2 switch, supports VLAN, complies with IEEE 802.3x, 802.1P

  • Provide two pluggable T1 cards, each card supports 8 T1s

  • Stable T1 clock recovery, low jitter and wander

  • Low processing delay for T1 channels, high bandwidth usage efficiency

  • PCM frame synchronization protection

  • User definable encapsulation packet size for different applications

  • Supports Ethernet encapsulation and UDP/IP protocol encapsulation

  • Supports VLAN settings for T1 service and in-band VLAN management

  • Jitter buffer for packet delay variation (PDV)

  • Local Ethernet Port throughput limit assuring T1 QoS

  • 100 Ohms balanced T1 port, RJ-45 connector

  • Support cascade concatenate for more than 16 T1 ports

  • Online upgrade for software

  • -48V DC Power supply redundancy.


Point to Point 8T1 or 16T1 over Ethernet Application Diagram

(A) Typical Application in Wireless Network

Point to Multipoint 8T1 or 16T1 - over Ethernet Application Diagram

(B) Typical Application in Wired Network

This configuration guarantees that the T1 channels get higher priority over computer data for maximum QoS.

The most widely used application of 8T1/16T1 x T1 over Ethernet multiplexer is to set up point to point wireless T1 links using low cost wireless LAN bridges or Ethernet RPR fiber links. 8/16 x T1 over Ethernet multiplexers can work with most LAN bridges available in the market. It may be necessary to adjust different parameters such as packet size and packet jitter absorption buffer size for best operation for different LAN bridges.

Product: TDMoIP-T1-EthMux x 8T1-xx or 16T1-xx

 8/16 x T1 over Ethernet, Multiplexer (TDM over IP) 5 GE electrical ports and 1 GE optical port (8T1 or 16 T1s ports offered)
Ethernet Ports 5 GE electrical ports and 1 GE optical port. Complied to IEEE 802.3, 802.1Q, 802.1P Speed and duplex auto-negotiation or manual
T1 Ports 8 T1 Ports Supported
16 T1 Ports Supported
Compiled to G.703
Impedance: T1-120 Ohms or 75 Ohms (optional extra)
Management Port IP / Ethernet Port
Web server and SNMP management supported
User (Local) Data Port(s) Available in 8T1/E1 and 16E1/T1 versions.

Technical Specifications

T1 Interface

Line Rate T1 (1.544 Mbit/s) 50 bps)
Available Time Slots 1-24
Framing D4, ESF (Pass Through / Transparent)
Electrical G.703
Jitter G.823
Impedance 100 ohms
Connector RJ-45 (F)

Configuration and Monitoring

HTTP Web Manager

Power Supply Options

Power Supply options Supply Pluggable dual power supply
2 x - 48 V DC
-48V-72V DC
100-240V AC
Consumption +<15W


Environmental Temperature 00C to 500C
Relative Humidity <90% (non-condensing)


Dimension W x H x D (mm) 440 x 44 x 231 (1U height)

Compliance and Regulatory

EMC FCC Part 15 Class 2
Operation ETS 300 019 Class 3.2
Storage ETS 300 019 Class 1.2
Transportation ETS 300 019 Class 2.3

Ordering Information

Model Number / Ordering Code Description
TDMoIP-T1-EthMux-8T1-DC 5 GE Uplink Ports, 8T1, 1 user data port with -48V DC power
TDMoIP-T1-EthMux-8T1-AC 5 GE Uplink Ports, 8T1, 1 user data port with AC power
TDMoIP-T1-EthMux-16T1-DC 5 GE Uplink Ports, 16T1, 1 user data port with -48V DC power
TDMoIP-T1-EthMux-16T1-AC 5 GE Uplink Ports, 16T1, 1 user data port with AC power

Others Links:

  STM SDH Multiplexers
  E1 VoIP-GSM Gateways
  VoIP SS7 and C7 Solution
  Echo Cancellers and VQE Solutions
  GSM Gateways / GSM Channel Banks
  E1 and T1 over Ethernet (TDM over IP)
  Digital Access Cross Connect Switch (DACS)
  E1, T1, E3, DS3, Ethernet Converter (IP over TDM)

Technical specifications are subject to change without notice.
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