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|   Ethernet over 4E1 Converter   |

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Ethernet over 4 E1 converter. The 10Base-T Ethernet interface to 4 E1 interface converter which offers a channelized E1 and 10Base-T interface conversion. This equipment offers electrical level conversion between 10Base-T Ethernet interface and a G.703 / E1 (or fractional E1) interfaces.

Ethernet over 4 E1 – 4E1/10(100) Base-T Interface Converter provides the user with 4 x Ethernet over  4 x E1 conversion enabling the user to transport Ethernet data over up to 4 E1 links.

The equipment be always installed and used in pairs, with one terminal being installed at either end of the network.

The equipment be always installed and used in pairs, with one terminal being installed at either end of the network.

The Ethernet over 4 E1 - 4E1/10(100) Base-T Interface Converter is an Ethernet extension device utilizing TDM telecom infrastructure (the telecom network of E1s, or of PDH, SDH and E1/E3/SDH microwave etc. carrying E1s). It converts the Ethernet data into E1 frame format for transmission over the existing TDM (E1) links and then re-converts the E1s back into Ethernet data the far-end terminal, to BRIDGE two Ethernet LANs over the existing E1-based telecom network. The device can effectively utilize the redundant bandwidth of telecom operators’ existing TDM network to transport Ethernet data with low investment.


The equipment may be used for the following purposes:

  • Bridging Ethernet LANs over existing TDM (E1) telecom network.
  • Extending Ethernet networks utilizing TDM (E1) landline based telecom infrastructure.
  • Interconnecting DSLAMs to Central Routers over PDH/SDH
  • Interconnecting IP based GSM base stations
  • Interconnecting WiMAX base stations
  • Using telecom network of E1s / PDH / SDH microwave etc. carrying E1s to transport Ethernet data.

In all cases the equipment be always installed and used in pairs, with one terminal being installed at either end of the network.

Application Diagram


  • Provides 4 E1 interfaces
  • Provides 4 Ethernet 10/100Mbps (Electrical) ports for each converter
  • The maximum transmission rate of Ethernet data over E1 links is 32.768Mbit/s
  • Optionally provides 3 Ethernet 10/100Mbps (Electrical) ports and 1 Ethernet (Optical) port for each converter
  • E1 supports three working modes of transmission. Un-Framed/Transparent, Framed, CAS / PCM 30 format
  • Supports VCAT (virtual concatenation) and LCAS (link capacity adjustment scheme) protocol, and complies with ITU-T G.7042 specifications
  • Mapping to E1 complies with ITU-T G.7043 and G.8040 specifications
  • Supports differential delay of up to 120ms on E1 links
  • Complies with IEEE 802.3 specifications
  • Support VLAN tagging as per 802.1Q
  • Supports 802.1 based QoS feature
  • Supports base priority classification for incoming 802.1Q packets
  • Supports IEEE 802.1p standard recommended Class of Service traffic categorization
  • Supports 802.1P priority classification for ingress packets
  • Provides 4 different user selectable ratios (0:1, 1:2, 1:5 and 1:10) for delivery of high and low priority packets
  • Supports 802.1 p based classification of 802.1Q based VLAN Packets which provides a mechanism for implementing Quality of Service (QoS)
  • User selectable ports for enabling / disabling the QoS service
  • Supports port based priority if the Equipment fails to classify the 802.1Q packets
  • Supports port based Ethernet bandwidth limit for ingress traffic
  • Port based Ethernet limit allows user to provide different speed for the different customers to utilize bandwidth according to their requirement.
  • Supports differential delay of up to 120ms on E1 Links
  • Complies with IEEE 802.3 specifications
  • Supports X.86, LAPS and HDLC transmission protocols
  • Supports 100M full-duplex mode
  • Configurable frame length upto 1916 bytes (MTU size)
  • Supports GFP-F encapsulation complying with ITU-T G.7041
  • Provide smooth adjustment of bandwidth
  • Provides Loss of Frame alarms
  • Provides error frame statistic
  • Supports automatic removal and addition of E1 links
  • Available with MAC address list filtration, learning, and updating functions
  • A large external SDRAM buffering for handling data bursts
  • E1 Interfaces support errors count
  • Supports two synchronization clock modes, Internal clock and Network clock (Loop-Timed clock) 

Salient Features

  • Data rate recovery after restoration of lost E1 (LCAS)
  • Automatic data rate management according to number of available E1 links
  • Maximum cable length supported (upto 1000 feet / 333 meters)

10/100BaseT Interface (Electrical)

Number of Interfaces 4
 Interface Types 10/100BaseT
Standards Compliance IEEE 802.3
Transmission Bit Rate 10/100BaseT limited to 2.048 Mbps
Connectors RJ-45 (10/100 BaseT Electrical)

10/100BaseT Interface (Optical)

Number of Interfaces 1
Wavelength 850nm / 1310nm / 1550nm
Compliance ITU-T G.957
Data Rate 125Mb/s
Connectors SC

E1 Interface - Technical Specifications

Number of E1 Port 4 E1
Line Rate E1 (2.048Mbps ± 50 bps)
Line Code HDB3
Framing Un-Framed /PCM 30 /PCM 31
Frame Structure As per ITU-T (CCITT) G.704
Clock Internal, Loop timed
Electrical G.703
Jitter G.823
Impedance 120 Ohms / 75 Ohms (Optional)
Connectors RJ-45 Female

Mechanical Specifications

Rack Mounting Standard 19-inch DIN rack (Ethernet over 4 E1 model)
Height 266mm (Desk-top or 1U high 19 inch rack mount)

Power Supply

Input DC Voltage -48V DC ( nominal ) / AC also available
Range of Input -40V to -60V DC
Output Voltage +5V
Input Voltage Reversal Protection Provided in the Card
Over Current Protection Provided in the Card
Short Circuit Protection Provided in the Card (recovers automatically)
Under Voltage < 4.5V
Over Voltage 5.4V to 5.6V
Efficiency at full load >80% Typ.
Ripple at full load <5mVrms
Spike at full load <50mV
Temperature 0°C to 55°C
Humidity 95% RH (non-condensing)
Cooling Convection Cooling

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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