Specifications

4E1/10/100M Protocol Converter  

  
4E1 is an Ethernet bridge specially designed to transmit Ethernet data over several E1 circuits. It enables point-to-point transmission of Ethernet MAC frame data through one to four E1 circuits, with a maximum designed transmission rate of 7.68 Mbps. 
 4E1 adopts demultiplexing technology, which binds several E1 circuits together to transmit 10M/100M Ethernet data, allowing certain transmission Timelag difference. It can extend the transmission distance and scope of application of Ethernet with existing E1 circuit resources of telecommunications network and is an ideal Ethernet broadband access solution.

Features

 Supporting transparent transmission of Ethernet data over 1 to  E1 circuits
In compliance with IEEE 802.3 protocol, supporting 10M/100M, full-duplex/half-duplex working mode
Supporting transparent transmission of jumbo frames specified in IEEE 802.1Q, and supporting Ethernet switch with VLAN function
Built-in dynamic Ethernet MAC address list (1024) in the chip, supporting local data frame filtering function
Built-in Ethernet data frame FCS check functional module, with check alarm output 
 Built-in Synchronous Dynamic Random Access Memory (SDRAM) controller
Optional butter area size to suit different types of services
E1 interface complies with ITU-T G.703, G.705, and G.823 recommendations, but does not support the use of signaling timeslot
Built-in clock recovery circuit and HDB3 coding/decoding circuit in E1 interface module
Supporting HDB3 code pattern 
 Supporting availability detection and automatic fault handling for 1 to  E1 circuits 
 Perfect line alarm indication and output 
 Supporting the reset of a remote system from a local system
Supporting E1 circuit loopback function
New peer end alarm function, enabling the user to remove faults visually
New lightning protection function, effectively preventing the threat of thunders and lightning on communication equipment   
 Supporting remote alarm function, enabling a network administrator to judge a remote E1 line fault from the local end (applicable to the carrier-class NE-2708D)
MTBF > 50,000 hours, in compliance with carrier-class operation requirements (applicable to the carrier-class NE-2708D)

Technical Parameters

1.   E1 interface
 Interface rate: 2048 Kb/s ± 50 ppml
Interface code pattern: HDB3l
Interface impedance: 75W/non-balancedl
Jitter tolerance: In compliance with G.823l
Output jitterl < 0.05 UI

2. 100/10Base-T interface
 Compatible with IEEE802.3/IEEEE802.3U Ethernet standardsl
Supporting 10M/100M, full-duplex/half-duplex working model
Dynamic address list storing 1024 Ethernet MAC addressl
Supporting automatic address update and local data frame filteringl functions

3.Operating Environment
  Ambient temperature: 0°C- 60°C
 Relative humidity: 5% - 95%
Atmospheric pressure: 86 – 106 Kpa
Power parameter: AC180V-240V (50Hz/60Hz)   power consumption < 5W
Dimensions: 268´145´35 (mm)