IP over TDM
Gigabit Ethernet over STM-4

Optical Interface

• Two STM-4 optical interfaces, LC type SFP module, hot-pluggablee
• Line Bit Rate is 622Mb/s (transmission distance depends on the SFP module)
• SFP MSA (INF-8074i), ITU-T G.695, FC-PI V2.0 standards
• Supports Automatic Laser Shutdown (ALS) function
• Supports Remote Power down Detect (RPD) function
• Provides 4 E1s and upto 1000 Mbps wire-speed Ethernet

Timing mode

• Internal timing source, complies with ITU-T G.813 standard
• STM-4 optical line timing source (T11, T12)
• Timing sources can be switched over according to alarms, SSM values, frequency offset, and the preset priority of the sources, or forced switch over.

Path Protection

• Supports 1+1 path protection and 2+0 non-protection mode
• Supports 1+1 path protection with the recovery time less than 50ms
• 1+1 linear unidirectional / bidirectional Multiplex Section Protection (MSP)
• Supports automatic protection switch and manually protection switch

Ethernet interface

• One Optical Gigabit Ethernet interface and two Electrical Gigabit Ethernet interfaces compliant to IEEE802.3 serial specification
• RJ45 connector Electrical Gigabit Ethernet interfaces, supports auto-negotiation, which can operate on 1000M full-duplex, 100M full/half-duplex, 10M full/half-duplex Mode
• The Optical Gigabit Ethernet interface uses 1.25G SFP module, which can work on 1000M full-duplex mode (transmission distance is optional and depends on the SFP Optical module)
• Supports unicast, multicast and broadcast frame
• Supports 802.3x flow control
• Supports broadcast storm filtering control
• 4K MAC address table, with optional 12s / 300s ageing time configurable, the default is 300s
• Supports MAC address dynamic learning function
• Accepts frames with lengths between 64 and 1518/2000/9720 bytes
• Supports port-based VLAN and IEEE802.1Q tag-based VLAN
• Supports QinQ (Double Tag VLAN)
• Supports port rate control
• Provides performance statistic for each Ethernet interface