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5-2
Cisco ONS 15310-CL and Cisco ONS 15310-MA Ethernet Card Software Feature and Configuration Guide R8.5
78-18133-01
Chapter 5 Configuring POS on the ML-Series Card
Understanding POS on the ML-Series Card
Caution The maximum tolerable VCAT differential delay for the ML-100T-8 is 48 milliseconds. The VCAT
differential delay is the relative arrival time measurement between members of a virtual concatenation
group (VCG).
Note The initial state of the ONS 15310-CL and ONS 15310-MA ML-Series card POS port is inactive. A POS
interface command of no shutdown is required to carry traffic on the SONET circuit.
Note ML-Series card POS interfaces normally send an alarm for signal label mismatch failure in the ONS
15454 STS path overhead (PDI-P) to the far end when the POS link goes down or when RPR wraps.
ML-Series card POS interfaces do not send PDI-P to the far-end when PDI-P is detected, when a remote
defection indication alarm (RDI-P) is being sent to the far end, or when the only defects detected are
generic framing procedure (GFP)-loss of frame delineation (LFD), GFP client signal fail (CSF), virtual
concatenation (VCAT)-loss of multiframe (LOM), or VCAT-loss of sequence (SQM).
LCAS Support
The ML-100T-8 card and the CE-100T-8 card (both the ONS 15310-CL/ONS 15310-MA version and the
ONS 15454 SONET/SDH version) 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.
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 terminating on an ONS 15454 SONET ML-Series card.
J1 Path Trace, and SONET Alarms
The ML-100T-8 card also reports SONET alarms and transmits and monitors the J1 path trace byte in
the same manner as OC-N cards. Support for path termination functions includes:
• H1 and H2 concatenation indication
• Bit interleaved parity 3 (BIP-3) generation
• G1 path status indication
• C2 path signal label read/write
Table 5-1 ML-Series Card Supported Circuit Sizes and Sizes Required for Ethernet Wire Speeds
Ethernet Wire Speed CCAT High Order VCAT High Order
10 Mbps STS-1 STS-1-1v
100 Mbps — STS-1-2v
1
1. STS-1-2v provides a total transport capacity of 98 Mbps