Техническая Спецификация для Cisco Cisco ONS 15305 Multiservice Customer Access Platform
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DATA SHEET
CISCO ONS 15305 2-PORT GIGABIT ETHERNET MODULE
The Cisco
®
ONS 15305 2-Port Gigabit Ethernet Module provides two ports for Layer 1 or Layer 2 switched transport of
Gigabit Ethernet traffic over SDH networks.
PRODUCT OVERVIEW
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.
Figure 1
Cisco ONS 15305 2-Port Gigabit Ethernet Module Block Diagram
The Cisco ONS 15305 2-Port Gigabit Ethernet Module supports the following two modes of operation: Two Gigabit Ethernet ports without
mapper circuits and two Gigabit Ethernet ports with mapper circuits.