Specifications

1-3
Cisco ONS 15530 Planning Guide
OL-7708-01
Chapter 1 System Overview
System Functional Overview
System Functional Overview
The Cisco ONS 15530 connects to client equipment, to the DWDM trunk (transport network), to other
Cisco ONS 15530 shelves, and to other DWDM equipment, such as the Cisco ONS 15540 ESP and
Cisco ONS 15540 ESPx. Simply described, the Cisco ONS 15530 takes a client signal and converts it to
an ITU-T G.692 compliant wavelength, then either optically multiplexes it with the other client signals
for transmission over an optical fiber link or sends it through an uplink connection to a
Cisco ONS 15540 ESP or Cisco ONS 15540 ESPx.
The Cisco ONS 15530 supports 1+1 path protection using both hardware mechanisms and software
based on the APS (Automatic Protection Switching) standard. In a single shelf configuration, a
Cisco ONS 15530 node can support up to four channels with facility (fiber) protection or with line card
protection, or eight unprotected channels. In a multiple shelf configuration, a node can support up to
32 channels. The Cisco ONS 15530 can be deployed in point-to-point, hubbed ring, and mesh
topologies.
The Cisco ONS 15530 is a duplex system with both light emitters and light detectors. For example, the
client side interfaces both transmit and receive light. The same is true of the DWDM interface. Also, the
OADM modules both multiplex the transmit signal and demultiplex the receive signal.
The Cisco ONS 15530 supports the following two types of transmission modes:
• Transparent mode using the transponder line cards
• Switched mode using the switch fabric on the CPU switch modules to cross connect the ESCON
aggregation cards, 4-port 1-Gbps/2-Gbps FC aggregation card, or 8-port FC/GE aggregation line
cards and 2.5-Gbps ITU trunk cards, 10-Gbps ITU tunable and non tunable trunk cards, or 10-Gbps
uplink cards.
Figure 1-2 illustrates the principal functions involved in transparent transmission of the signal between
the client and trunk networks using the transponder line card. Optical cross connections from the front
panel of the transponder line card take the signal to the OADM module.
Figure 1-2 Simplified Data Flow Architecture For a Transponder Line Card
Figure 1-3 illustrates the principal functions involved in transmission of the signal between the client
and trunk networks using the ESCON aggregation card and the 10-Gbps ITU trunk card. Electrical cross
connections from the backplane side of the ESCON aggregation card take the signal through the switch
fabrics on the CPU switch modules to the 10-Gbps ITU trunk card. Optical cross connections from the
front panel of the 10-Gbps ITU trunk card take the signal to the OADM module.
85513
Transceiver
Client
ITU
optics
Client
optics
O
Transponder
Transport network
(ITU wavelength)
OADM
OE
3R
Front panel cross
connection