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Cisco ONS 15310-CL and Cisco ONS 15310-MA Ethernet Card Software Feature and Configuration Guide R8.5
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Chapter 17 CE-100T-8 Ethernet Operation
CE-100T-8 Ethernet Features
The CE-100T-8 offers full TL1-based provisioning capability. Refer to the Cisco ONS SONET TL1
Command Guide for CE-100T-8 TL1 provisioning commands.
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 network. Information
in the headers is not affected by the encapsulation and tr ansport. For example, included IEEE 802.1Q
information will travel through the process unaffected.
The ONS 15454 CE-100T-8 and the ONS 15310 CE-100T-8 support maximum Ethernet frame sizes of
1600 bytes including the CRC. The MTU size is not configureable and is set at a 1500 byte maximum
(standard Ethernet MTU). Baby giant frames in which the st andard Ethernet frame is augmented by
IEEE 802.1 Q tags or MPLS tags are also supported. Full Jumbo frames (9000 byte maximum) are not
supported.
The CE-100T-8 cards discard certain types of erroneous Ethernet frames rather than transport them over
SONET. Erroneous Ethernet frames include corrupted frames with cyclic redundancy check (CRC)
errors and undersized frames that do not conform to th e minimum 64-byte length Ethernet standard.
Note Many Ethernet attributes are also available through the network element default feature. For more
information on NE defaults, refer to the “Network Element Defaults” appendix in the Cisco ONS 15454
Reference Manual.

Autonegotiation, Flow Control, and Frame Buffering

On the CE-100T-8 card, Ethernet link autonegotiation is on by default when the sp eed or duplex of the
port is set to auto. The user can also set the link speed, duplex, selective autonegotiation, and flow control
manually under the card-level Provisioning tab of CTC.
The CE-100T-8 card supports selective autonegotiation on the Ethernet ports. If selective
autonegotiation is enabled, the port attempts to auto negotiate only to a specific speed and duplex. The
link will come up if both the speed and duplex of the attached autonegotiating device matches that of the
port. You cannot enable selective autonegotiation if either the speed or duplex of the port is set to auto.
The CE-100T-8 card supports IEEE 802.3x flow control and frame buffering to reduce data traffic
congestion. Flow control is on by default.
To prevent over-subscription, buffer memory is available for each port. When the buffer memory on the
Ethernet port nears capacity, the CE-100T-8 card uses IEEE 802.3x flow control to transmit a p ause
frame to the attached Ethernet device. Flow co ntrol and autonegotiation frames are local to the Fast
Ethernet interfaces and the attached Ethernet devices. These frames do not continue through the POS
ports.
The CE-100T-8 card has symmetric flow control and proposes symmetric flow control when
autonegotiating flow control with attached Ethernet devices. Symme tric flow control allows the
CE-100T-8 cards to respond to pause frames sent from external devices and to send pause frames to
external devices.