Cisco ONS 15600 Reference Manual page 237

Chapter 10 Ethernet Operation
Figure 10-1
Ethernet
Port
Ethernet
Port
The ONS 15600 SDH provides transport functionality of all frames arriving on the Ethernet interfaces.
Frames arriving on each Ethernet interface are mapped onto their own SDH path. In the reverse direction,
frames arriving on an SDH path are mapped to one and only one Ethernet interface. Frames arriving on
different Ethernet interfaces are not mapped onto the same SDH path.
Valid received Ethernet frames are encapsulated and transported across the SDH 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 an SDH network.
Figure 10-2
Ethernet
Port
Eth Frame
A valid frame is defined as one with the following attributes:
78-18400-01
ONS 15600 SDH Ethernet Frame Transport
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
SDH
Matrix
SDH
Backplane Connection
P
O
H
Matrix
Cisco ONS 15600 SDH Reference Manual, Release 9.0
10.2 Transport Functionality
SDH
Line Card
SDH
Line Card
10-3