E1 Interface:
•    Line Rate: 2.048Mbps±50ppm
•    Line Code : HDB3
•    Interface Standard: ITU-T G.703
•    E1 Impedance: 75Ω(unbalance) or 120Ω(balance)
•    Connections : dual coax BNC and 120-ohm twisted-pair (RJ45)
•    Jitter tolerance : finer than G.742 and G.823
•    10/100 Base –T interface:
•    Rate: 10/100M, full/duplex auto-negotiation
•    Protocol: Support IEEE 802.3, IEEE 802.1Q (VLAN)
•    MAC Address Entries: 4096 Entries
•    Physical interface: RJ45, support AUTO-MDIX
•    Power supply:                       
•    Working voltage range wide, good         
•    anti-disturb and Isolation, work stable      
•    Option I – DC-48V, range DC-36V~DC-72C    
•    Option II – AC220V, range AC165V~AC240V
•    Power Consumption:     <=10 Watts
•    Environment condition:                  
•    Operating temperature:  0C~+50 C         
•    Storage temperature:   -20 C~+70 C
•    Relative temperature: 95% (uncondensed)
Dimension:                   
 19” rack mount
•    433mm(L)
•    138mm(W)
•     44mm(H