Specifications

1-9
Cisco ONS 15530 Planning Guide
OL-7708-01
Chapter 1 System Overview
System Components
For GE, FC, and FICON traffic, the Cisco ONS 15530 monitors the following conditions:
• CVRD (code violation running disparity) error counts
• Loss of Sync
• Loss of Lock
• Loss of Light
For SONET errors, the Cisco ONS 15530 monitors the SONET section overhead only, not the SONET
line overhead. Specifically, the system monitors the B1 byte and the framing bytes. The system detects
the following defect conditions:
• Loss of Light
• Loss of Lock (when the clock cannot be recovered from the received data stream)
• Severely errored frame
• Loss of Frame
For SONET performance, the system monitors the B1 byte, which is used to compute the four SONET
section layer performance monitor parameters:
• SEFS-S (second severely errored framing seconds)
• CV-S (section code violations)
• ES-S (section errored seconds)
• SES-S (section severely errored seconds)
For ISC-3 traffic, the system monitors the following conditions:
• CVRD error counts
• Loss of CDR (clock data recovery) Lock
• Loss of Light
ESCON Aggregation Cards
The Cisco ONS 15530 supports a line card specifically for ESCON traffic. The ESCON aggregation card
accepts up to 10 SFP (small form-factor pluggable) optics for client traffic. The ESCON aggregation
card converts the client signals from optical form to electrical and then aggregates them into a single
signal. This aggregated signal passes through the backplane and the switch fabric on the active CPU
switch module to a 2.5-Gbps ITU trunk card, 10-Gbps ITU tunable or non tunable trunk card, or a
10-Gbps uplink card (see Figure 1-3). The cross connection between the two cards through the
backplane and switch fabrics is configured using the CLI. The ESCON aggregation card has redundant
connections over the backplane to the switch fabrics on the active and standby CPU switch modules.
Figure 1-5 shows the architecture of the ESCON aggregation card.