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G.shdsl.bis 4-wire LAN Extender - 11.4Mbps Ethernet bridge modem - up to 4.9mi loop length on 26 AWG
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G.shdsl.bis 4-wire LAN Extender - 11.4Mbps Ethernet bridge modem - up to 4.9mi loop length on 26 AWG

CTC Union Part No.: EFM-20

  • $ 370.00 or


The EFM-20 is an Ethernet Network Extender using bonded G.shdsl.bis technology over copper wires. Unit supports EFM (Ethernet First Mile) 2Base-TL technology, a collection of standards for Ethernet over LAN, MAN and WAN deployments. EFM-20 uses the 802.3ah management protocol, making it a very powerful unit for service providers and providing all needed mass deployment features. EFM-20 has a 4 port Ethernet switch with advanced VLAN and QoS capabilities. Management includes web-based interface, SNMP, telnet CLI interface and local console port.

The EFM-20 can provide 11.4Mbps of data throughput on a 4 wire (2 pairs) AWG26 copper lines. QoS services can help setting ingress/egress data rates and data traffic can be proritized according to WRR/ BE or SP rules. EFM-20 can be used in point to point connections.

Technical specifications

WAN Interface: RJ45 8 pins, SHDSL.bis ITU-T G.991.2 Annex AF/BG
encoding 16-TCPAM, 32-TCPAM
2BASE-TL, 64/65 octet encoding
EFM bonding (802.3ah PAF)
5.7Mbps rate per pair of copper line
135ohms impedance
LAN Interface: 4 port 10/100Base-TX switch w/ auto MDI/MDI-X
802.1d transparent bridging
QoS features: Ingress Rate control/ Egress Traffic shaping
4 port Priority Queue
WRR (Weighted Round Robin)/BE (Best Effort)/ SP (Strict Priority) policies
VLAN features: 802.1q and port-based VLAN support
Q-in-Q VLAN support
VLAN Trunk mode
Management: web-based GUI
CLI interface for console and telnet access
SNMP v1/v2 agent (RFC 1157/1901/1905)
MIB II support (RFC 1213/1493)
EFM OAM support (IEEE 802.3ah)
software upgrade via web or TFTP
Memory: 2Mb FLASH memory, 4Mb SDRAM
Operating distance: up to 8Km on AWG 26 copper wire
Front LEDs: PWR, Alarm, Mgmt, Wan Act/Link, LAN Act/Link/Speed
Power: External 90-260V AC switching adapter 9VDC@1A with NEMA1-15(2 blades only), US type main plug
Consumption: 9 Watt maximum
Temperature: 0 5°C (Operating); 0 7°C (Storage)
Humidity: 10 90% non condensing (Operating); 0 70% (Storage)
Dimensions(WxDxH): 168mm x 195mm x 48mm
MTBF: 35,000 hours
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