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10-2
Cisco ONS 15600 Reference Manual, R7.2
Chapter 10 Ethernet Operation
10.2 Transport Functionality
Each ASAP 4-port I/O (ASAP_4PIO) PIM is hot-pluggable while other ports on other PIMs are
functioning. Each SFP is also hot-pluggable.
Layer 1 Ethernet transport is implemented for Gigabit Ethernet (GE) interfaces. GE traffic is
encapsulated by generic framing procedure (GFP), ITU X.86, or Cisco high-level data link control/LAN
extension (HDLC/LEX) and mapped into a SONET payload.
The data path processing consists of:
•
Optical-to-electrical conversion (O/E) and electrical to optical (E/O) on the ASAP_4PIO PIM
•
Gigabit Ethernet to Ethernet over SONET (EoS) mapping (for the GE ports only)
Note
For a single flow of Gigabit Ethernet, traffic can be mapped to an STS-48c. This choice limits maximum
usable Ethernet ports to eight when all are mapped to STS-48c. Any time an STS-48c is used for an
Ethernet connection, one-eighth of the total card bandwidth is consumed on the EoS mapper.
Ethernet facilities on the ASAP card include:
•
Ethernet ports can be provisioned on a multirate PPM.
•
Encapsulation methods allowed for the Ethernet ports are:
–
Cisco HDLC/LEX
–
GFP
–
ITU X.86
•
Provisioning of an Ethernet port automatically provisions a POS port for the connection and circuit.
10.2 Transport Functionality
Figure 10-1 shows the transport of Ethernet frames into a SONET path using the ASAP carrier card in
the ONS 15600.