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Cisco ONS 15310-CL and Cisco ONS 15310-MA Ethernet Card Software Feature and Configuration Guide R8.5
78-18133-01
Chapter 17 CE-100T-8 Ethernet Operation
CE-100T-8 SONET Circuits and Features
The ONS 15454 SONET/SDH ML-Series card has a software-based LCAS (SW-LCAS) scheme. This
scheme is also supported by both the ML-100T-8 card and both versions of the CE-100T-8, but only for
circuits with the other end terminating on an ONS 15454 SONET/SDH ML-Series card.
The CE-100T-8 card allows independent routing and protection preferences for each member of a VCAT
circuit. The user can also control the amount of VCAT circuit capacity that is fully protected, unprotected
or if the circuit is on a bidirectional line switched ring (BLSR), uses protection channel access (PCA).
Alarms are supported on a per-member as well as per virtual concatenation group (VCG) basis.
Note The maximum tolerable VCAT differential delay for the CE-100T-8 is 48 milliseconds. The VCAT
differential delay is the relative arrival time measurement between members of a virtual concatenation
group (VCG).
On ML-100T-8 and CE-100T-8 cards, members of a HW-LCAS circuit must be moved to the OOS,OOG
(locked, outOfGroup) state before you delete them.
A traffic hit is seen under the following conditions:
• A hard reset of the card containing the trunk port.
• Trunk port moved to OOS,DSBLD (locked,disabled) state.
• Trunk fiber pull.
• Deletion of members of the HW-LCAS circuit in IG (In Group) state.
CE-100T-8 POS Encapsulation, Framing, and CRC
The CE-100T-8 uses Cisco EoS LEX (LEX). LEX is the primary encapsulation of ONS Ethernet cards.
In this encapsulation the protocol field is set to the values specified in Internet Engineering Task Force
(IETF) Request For Comments (RFC) 1841. The user can provision GPF-F framing (default) or
high-level data link control (HDLC) framing. With GFP-F framing, the user can also configure a 32-bit
CRC (the default) or no CRC (none). aming. With GFP-F framing, the user can also configure a 32-bit
CRC (the default) or no CRC (none). On CTC go to CE card view and click the Provisioning >pos ports
tab, to see the various parameters that can be configured on the POS ports, see Displaying ML-Series
Ethernet Statistics in CTC, page 2-2. Various parameters like, admin state, service state, framing type,
CRC , MTU and soak time for a port can be configured hereWhen LEX is used over GFP-F it is standard
Mapped Ethernet over GFP-F according to ITU-T G.7041. HDLC framing provides a set 32-bit CRC.
Figure 17-5 illustrates CE-100T-8 framing and encapsulation.