24-2
Ethernet Card Software Feature and Configuration Guide, R7.2
January 2009
Chapter 24 CE-100T-8 Ethernet Operation
CE-100T-8 Ethernet Features
The CE-100T-8 card carries any Layer 3 protocol that can be encapsulated and transpo rted over Ethernet,
such as IP or IPX. The Ethernet frame from the data network is transmitted on the Ethernet cable into
the standard RJ-45 port on a CE-100T-8 card. The CE-100T-8 card transparently maps Ethernet frames
into the SONET/SDH payload using packet-over-SONET/SDH (POS) encapsulation. The POS circuit
with its encapsulated Ethernet inside is then multiplexed onto an optical card like any other SONET
synchronous transport signal (STS) or SDH synchronous transport mode (STM). When the payload
reaches the destination node, the process is reversed and the data is transmitted from the standard RJ-45
port in the destination CE-100T-8 card onto the Ethernet cable and data network. The POS process is
covered in detail in Chapter 20, “POS on ONS Ethernet Cards.”
The CE-100T-8 card supports ITU-T G.707 and Telcordia GR-253 based standards. It allows a soft reset,
which is errorless in most cases. During the soft reset if there is a provisioning change, or if the firmware
is replaced during the software upgrade process, the reset is equivalent to a hard reset. For more
information on a soft reset of a CE-100T-8 card using CTC, refer to the Cisco ONS 15454
Procedure Guide or the Cisco ONS 15454 SDH Procedure Guide.
CE-100T-8 Ethernet Features
The CE-100T-8 card has eight front-end Ethernet ports which use standard RJ-45 connectors for
10BASE-T Ethernet/100BASE-TX Ethernet media. Ethernet Ports 1 through 8 each map to a POS port
with a corresponding number. The console port on the CE-100T-8 card is not functional.
The CE-100T-8 cards forward valid Ethernet frames unmodified over the SONET/SDH network.
Information in the headers is not affected by the encapsulation and transport. For example, included
IEEE 802.1Q information will travel through the process unaffected.
The ONS 15454 SONET/SDH CE-100T-8 and the ONS 15310-CL CE-100T-8 support maximum
Ethernet frame sizes of 1548 bytes including the Cyclic Redundancy Check (CRC). The Maximum
Transmission Unit (MTU) size is not configurable and is set at a 1500 byte maximum ( standard Ethernet
MTU). Baby giant frames in which the standard Ethernet frame is augmented by IEEE 802.1 Q-tags or
Multiprotocol Label Switching (MPLS) tags are also supported. Full Jumbo frames are not supported.
The CE-100T-8 cards discard certain types of erroneous Ethernet frames rather than transport them over
SONET/SDH. Erroneous Ethernet frames include corrupted frames with CRC errors and und ersized
frames that do not conform to the minimum 64-byte len gth Ethernet standard.
Note Many Ethernet attributes are also available through the network element (NE) defaults feature. For more
information on NE defaults, refer to the "Network Element Defaults" appendix in the Cisco ONS 15454
Reference Manual or the Cisco ONS 15454 SDH Reference Manual.

Autonegotiation, Flow Control, and Frame Buffering

On the CE-100T-8, Ethernet link autonegotiation is on by default and when the port’s duplex or speed is
set to auto. The user can also set the link speed, duplex, and flow control manually under the card-level
Provisioning tab of CTC.
The CE-100T-8 supports IEEE 802.3x flow control and frame buffering to reduce data traffic congestion.
Flow control is on by default.