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Cisco ONS 15310-CL, ONS 15310-MA, and ONS 15310-MA SDH Ethernet Card Software Feature and Configuration Guide, R9.1 and R9.2
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Chapter 17 CE-Series Ethernet Cards
CE-100T-8 Ethernet Card
CE-100T-8 VCAT Characteristics
The ML-100T-8 card and the CE-100T-8 card (both the version for the ONS 15310-CL and
ONS 15310-MA and the version for the ONS 15454 SONET/SDH) have hardware-based support for the
ITU-T G.7042 standard link capacity adjustment scheme (LCAS). This allows the user to dynamically
resize a high order or low order VCAT circuit through CTC or TL1 without affecting other members of
the VCG (errorless). ML-100T-8 LCAS support is high order only and is limited to a two member VCG.
To enable end-to-end connectivity in a VCAT circuit that traverses through a third-party network, you
must create a server trail between the ports. For more details, refer to the “Create Circuits and VT
Tunnels” chapter in the Cisco ONS 15310-CL and Cisco ONS 15310-MA Procedure Guide.
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 c ard.
The SW-LCAS is not supported on CE-100T-8 cards for interoperation with the CE-MR-10, CE-MR-6,
and ML-MR-10 cards.
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). 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 when 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.