EOE1A Ethernet over unframed E1 w/SNMP

Ethernet over unframed E1 w/SNMP

The EOE1A is a Channel Service Unit for unframed ITU-T G.703 E1 that features a built-in Ethernet bridge. The CSU has a built-in Network Terminating Unit (NTU) and may connect to either 75 Ohm unbalanced, BNC connectors or to 120 Ohm balanced, unframed E1 via twisted pairs and a shielded RJ-45 connector. The EOE1-A Ethernet Bridge uses HDLC encapsulation to transport Ethernet packets across the WAN and supports 10/100 auto-negotiation or manual settings for 10M, 100M, Full or Half Duplex Ethernet. The Ethernet port also supports a standard auto-MDIX feature that will completely eliminate Ethernet cross-over cables or the guessing that is sometimes involved in choosing a cable when connecting to a HUB or a PC. The EOE1-A is very easy to configure by a menu driven serial console interface. SNMP and proprietary MIB add the ability to manage the EOE1-A centrally through third party network management software.

Ethernet over unframed E1 w/SNMP schematic


  • Supports 10/100Base-TX Ethernet over Unframed E1
  • Automatic address learning, aging and deletion after 5 minutes
  • Auto padding of undersized packets to meet the minimum Ethernet packet size requirement
  • Buffering modes can be selected according to the setting of WAN and LAN line speeds
  • Forwarding and filtering rate at WAN speed with throughput latency of 1 frame
  • Auto MDI / MDIX
  • Real-time filtering with 256 MAC address table
  • Supports Console, Telnet, SNMP and Web management


G.703 E1 Specifications

Framing: Unframed
Line code: AMI/HD83
Bit rate: 2.048Mbps (clear channel)
Relative receive level: 0 to -43dB
Transmit level:

  • Pulse Nominal 2.37V ±10% for 75ohm
  • Amplitude Nominal 3.00V ±10% for 120ohm; Zero amplitude ±0.1V

Jitter performance: According to ITU-T G.823
Connector: BNC(unbalanced), RJ-48(balanced)
Clock modes:

  • Clock mode 0 Receive & transmit clock (DCE1) (recovered) to the sync. DTE
  • Clock mode 1 Receive & transmit clock (DCE2) (internal oscillator) to the sync. DTE

Test Switches: Digital local loopback, Analog local
Diagnostics: Digital local and remote loopback, Analog local loopback, Test pattern

Ethernet Specifications

Connector: RJ-45
Data Rate: 10/100Mbps; Half Duplex / 20/ 200Mbps; Full duplex
Filtering & Forwarding: 90,000 packets/sec
Delay: 1 frame
Frame Buffer: 340 frames
MAC Table: 256 MAC address
Protocol: Synchronous HDLC
Indications: LEDs (Power, Signal Loss, Alarm, Link, TD, RD, 100, Full,Error, Error, Test)

Standard: ITU-T G.703, G.706 and G.732, IEEE 802.3/802.3u
Management: Console, Telnet, Web, SNMP
Power Input: AC: 90-250VAC ; DC: 18-72 VCD
Power Consumption: 20W
Dimensions: 250 x 195 x 45mm (D x W x H)
Weight: 1.5kg
Temperature: 0 ~ 50°C (Operating), -10 ~ 70°C (Storage)
Humidity: 10~90% non-condensing
Certification: CE, FCC, RoHS
MTBF: 57,000 hrs (25°C)