- 2 x SFP
- plug-in module
The Cisco ONS 15305 2-Port Gigabit Ethernet Module is a service module for the Cisco ONS 15305 Multiservice Provisioning Platform (MSPP) that supports up to two Small Form-Factor Pluggable (SFP) optics to interface with LANs. The module uses ITU-T G.7041 standard Generic Framing Procedure (GFP) and ITU-T G. 707 virtual concatenation (VCAT) to encapsulate and map packets onto the SDH frame. Two internal WAN mapper ports connect the Gigabit Ethernet-over-SDH traffic streams to the TDM fabric on the Cisco ONS 15305, allowing cross-connections to optical STM-n ports. SDH capacity can be individually configured for each WAN mapper port using standard VCAT, allowing Ethernet-over-SDH transport at line-rate or below line-rate speeds. Additionally, the module has an internal Layer 2 switch fabric with four Gigabit Ethernet ports. Depending on the mode of operation, two of the Gigabit Ethernet ports on the Layer 2 switch are connected either to the WAN mapper ports or to the LAN ports in the front of the module. The two remaining Gigabit Ethernet ports are connected to a centralized crossbar that allows packet connectivity between other Ethernet modules in the same system. Figure 1 shows a block diagram of the module architecture.