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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 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 1545 4 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, unprot ected
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 ON S 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.