10-3
Cisco ONS 15600 SDH Reference Manual, Release 9.0
78-18400-01
Chapter 10 Ethernet Operation
10.2 Transport Functionality
Figure 10-1
ONS 15600 SDH Ethernet Frame Transport
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.
shows Ethernet framing with HDLC/GFP header/trailers and mapping into a synchronous
payload envelope (SPE) for transport over an SDH network.
Figure 10-2
Ethernet Framing
A valid frame is defined as one with the following attributes:
159582
SDH
Backplane Connection
Ethernet
Line Card
(ASAP)
SDH
Line Card
SDH
Line Card
Matrix
Ethernet
Port
Ethernet
Processing
Ethernet
Port
Ethernet
Processing
159583
SDH
Backplane Connection
Ethernet
Line Card
Matrix
Ethernet
Port
Ethernet
Processing
Eth Frame
HDLC/GFP
P
O
H