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|   8E1 and 16E1 over Ethernet Multiplexer (TDMoIP)  |

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Comarra's offers 8/16 x E1 over Ethernet multiplexer (TDM over IP) product supports transportation of 8 E1 or 16 E1s and 5 GE electrical ports and 1 GE optical port. The uplink ports and user data ports are IEEE 802.3 compliant, 10/100/1000M auto-sensing Ethernet ports.

The state-of-art design provides the highest availability with the accurate timing signal and data bit stream reconstruction.

8 E1 and 16 E1 over Ethernet multiplexer (TDM over IP) - Product Brochure (PDF)

Telecom and Enterprise users can save a lot of equipment costs and generates new revenue by offering different types of services over their packet-switched infrastructure. It is also suitable for connecting to the wireless equipment to achieve fast deployment of E1 services. One particular application is to build E1 links with low cost Wireless LAN bridges, replacing much more costly microwave radios. Operators can use 8/16 x E1 over Ethernet multiplexer (TDM over IP) to provide legacy TDM services over wired or wireless Ethernet/IP network.


  • Provides 8E1 and 16E1 ports (available in 1E1, 2E1, 8E1 and 16E1 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 E1 cards, each card supports 8 E1s
  • Stable E1 clock recovery, low jitter and wander
  • Low processing delay for E1 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 E1 service and in-band VLAN management
  • Jitter buffer for packet delay variation (PDV)
  • Local Ethernet Port throughput limit assuring E1 QoS
  • 120 Ohms balanced E1/T1 port, RJ-45 connector
  • Supports 75 Ohms unbalanced port (optional extra)
  • Support cascade concatenate for more than 16 E1 ports
  • Online upgrade for software
  • -48V DC Power supply redundancy.


Point to Point 8E1 or 16E1 over Ethernet Application Diagram

(A) Typical Application in Wireless Network

Point to Multipoint 8E1 or 16E1 - over Ethernet Application Diagram

(B) Typical Application in Wired Network

This configuration guarantees that the E1 channels get higher priority over computer data for maximum QoS.

The most widely used application of 8E1/16E1 x E1 over Ethernet multiplexer is to set up point to point wireless E1 links using low cost wireless LAN bridges or Ethernet RPR fiber links. 8/16 x E1 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-EthMux x 8E1-xx or 16E1-xx

8/16 x E1 over Ethernet, Multiplexer (TDM over IP) 5 GE electrical ports and 1 GE optical port (8E1 or 16 E1s 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
E1 Ports 8 E1 Ports Supported
16 E1 Ports Supported
Compiled to G.703
Impedance: E1-120 Ohms or 75 Ohms (optional extra)
Management Port IP / Ethernet Port
Web server and SNMP management supported
User (Local) Data Port(s) Available in 8E1/T1 and 16E1/T1 versions.

Technical Specifications

E1 Interface

Line Rate E1 (2.048 Mbps 50 bps)
Available Time Slots 1-31
Framing G.704
Electrical G.703
Jitter G.823
Impedance 120 ohms
Connector RJ-45 (F) or BNC

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-E1-EthMux-8E1-DC 5 GE Uplink Ports, 8E1, 1 user data port with -48V DC power
TDMoIP-E1-EthMux-8E1-AC 5 GE Uplink Ports, 8E1, 1 user data port with AC power
TDMoIP-E1-EthMux-16E1-DC 5 GE Uplink Ports, 16E1, 1 user data port with -48V DC power
TDMoIP-E1-EthMux-16E1-AC 5 GE Uplink Ports, 16E1, 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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