Cisco ONS 15600 Reference Manual page 205

Chapter 10 Ethernet Operation
Figure 10-1
Ethernet
Port
Ethernet
Port
The ONS 15600 provides transport functionality of all frames arriving on the Ethernet interfaces.
Frames arriving on each Ethernet interface are mapped onto their own SONET path. In the reverse
direction, frames arriving on a SONET path are mapped to one and only one Ethernet interface. Frames
arriving on different Ethernet interfaces are not mapped onto the same SONET path.
Valid received Ethernet frames are encapsulated and transported across the SONET network. There are
no modifications made to any bits in the frame that is delivered at the destination Ethernet port. Because
invalid frames are dropped, this transport is not transparent.
Figure 10-2
payload envelope (SPE) for transport over a SONET network.
Figure 10-2
Ethernet
Port
Eth Frame
ONS 15600 Ethernet Frame Transport
SONET
Backplane Connection
Ethernet
Processing
Ethernet
Processing
Ethernet
Line Card
(ASAP)
shows Ethernet framing with HDLC/GFP header/trailers and mapping into a synchronous
Ethernet Framing
Ethernet
Processing
Ethernet
Line Card
HDLC/GFP
P
O
H
Matrix
SONET
Backplane Connection
Matrix
Cisco ONS 15600 Reference Manual, R6.0
10.2 Transport Functionality
SONET
Line Card
SONET
Line Card
10-3