Overview

The Cisco ONS 15540 ESP (Extended Services Platform) is an optical transport platform that employs DWDM (dense wavelength division multiplexing) technology. With the Cisco ONS 15540 ESP, users can take advantage of the availability of dark fiber to build a common infrastructure that supports data, SAN (storage area network), and TDM (time-division multiplexing) traffic. For more information about DWDM technology and applications, refer to the Introduction to DWDM Technology publication and the Cisco ONS 15540 ESP Planning and Design Guide.

Cisco ONS 15540 Hardware Features

This section describes the hardware features and components of the Cisco ONS 15540.

Chassis Overview

The Cisco ONS 15540 uses a 12-slot modular vertical chassis. As you face the chassis, the two leftmost slots (slots 0 and 1) hold the optical mux/demux motherboards, which are populated with optical mux/demux modules. Slots 2 through 5 and 8 through 11 hold the line card motherboards, which are populated with transponder modules. Slots 6 and 7 hold the processor cards (see Figure 1-1). Air inlet, fan tray, and cable management are located beneath the modular slots. The system has an optical backplane for carrying signals between the transponders and the mux/demux modules, and an electrical backplane for system control.

Component Summary

The Cisco ONS 15540 supports the following hot-swappable modular hardware components:

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Line card motherboards—Up to eight in a system, each of which accepts up to four transponder modules. The line card motherboards are modular and can be populated according to user needs.There are three types of line card motherboards: splitter protected, unprotected "west" direction, and unprotected "east" direction.

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Transponder modules—Up to four per line card motherboard. Each transponder module has a single external interface to the client side and an internal interface that connects over the system's optical backplane to the mux/demux modules. The transponder modules are hot pluggable, permitting in-service upgrades and replacement. The transponder modules transmit the ITU wavelength, or channel, to the mux/demux modules.

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Optical mux/demux motherboards—One per system for unprotected operation or two per system for protection. Each mux/demux motherboard can accept up to four mux/demux modules. The mux/demux motherboards are modular and can be populated according to user needs.

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Optical add/drop mux/demux modules—Up to four per mux/demux motherboard. Each add/drop mux/demux module can multiplex and demultiplex a band of 4 or 8 channels, for a maximum of 32 channels. Channels not filtered by the OADM module are passed on to the next add/drop mux/demux module. The add/drop mux/demux modules connect to the trunk side and to the transponder modules over the optical backplane.

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Optical terminal mux/demux modules—Up to two per mux/demux motherboard. Each terminal mux/demux module can multiplex and demultiplex a band of 16 channels, for a maximum of 32 channels. All of the channels received by the terminal mux/demux modules are terminated, none are passed through. The terminal mux/demux modules connect to the trunk side and to the transponder modules over the optical backplane.

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Processor cards—Two per system for fault tolerance. The processor cards provide system processing, redundancy arbitration, clocking, and other central functions.

Transponder Modules

In the transponder module, the client signal is converted into an ITU-compliant wavelength, which is cross-connected over the optical backplane to the mux/demux modules. You can populate the line card motherboard subcard slots with as few or as many transponder modules as required (up to 32) to support the desired number of client signals, or data channels.

All client signals are supported in 3R (reshape, retime, retransmit) mode, regardless of protocol encapsulation type.

The Cisco ONS 15540 supports three types of single interface transponder modules:

SM Transponder Modules

SM transponders modules have a fixed, non-pluggable transceivers for the single client interface. SM transponder modules accept SM client signals on the 1310-nm wavelength through an SC connector and support client signal clock rates ranging from 16 Mbps to 2.5 Gbps.

On the trunk side, the SM transponder modules have output (laser) power in the range of 4 to 8 dBm and receive (detector) sensitivity of -28 dBm. For more information on power budget planning, refer to the Cisco ONS 15540 ESP Planning and Design Guide. For power budget specifications for individual components, refer to the Cisco ONS 15540 ESP Hardware Installation Guide.

The following protocol encapsulation types are supported in 3R mode plus protocol monitoring:

The following protocol encapsulation types are supported in 3R mode without protocol monitoring:

The SM transponder modules also support the OFC (open fiber control) safety protocol for Fibre Channel, ISC compatibility mode, and FICON.

MM Transponder Modules

MM transponder moduless have a fixed, non-pluggable transceivers for the single client interface. MM transponder modules accept both SM client signals and MM client signals on the 1310-nm wavelength through an SC connector and support client signal clock rates ranging from 16 Mbps to 622 Mbps.

On the trunk side, the MM transponder modules have output (laser) power in the range of 4 to 8 dBm and receive (detector) sensitivity of -28 dBm.For more information on power budget planning, refer to the Cisco ONS 15540 ESP Planning and Design Guide. For power budget specifications for individual components, refer to the Cisco ONS 15540 ESP Hardware Installation Guide.

The following protocol encapsulation types are supported in 3R mode plus protocol monitoring:

The following protocol encapsulation types are supported in 3R mode without protocol monitoring:

Extended Range Transponder Modules with Selectable Transceivers

The extended range transponder module accepts a selectable transceiver module that supports a specific protocol rate.

On the trunk side, the Type 2 extended range transponder modules have output (laser) power in the range of 5 to 10 dBm and receive (detector) sensitivity of -28 dBm. For more information on power budget planning, refer to the Cisco ONS 15540 ESP Planning and Design Guide. For power budget specifications for individual components, refer to the Cisco ONS 15540 ESP Hardware Installation Guide.

Table 1-1 lists features for the selectable transceivers supported by the extended range transponders.

Table 1-1 Selectable Transceiver Features
Part Number	Supported Protocols	Fiber Type	Wavelength	Connector Type
15500-XVRA-01A2	ESCON, SONET OC-3 SR, SDH STM-1	MM 62.5/125 �m	1310 nm	MT-RJ
15500-XVRA-02C1	Gigabit Ethernet¹, Fibre Channel (1 Gbps)²	MM 50/125 �m MM 62.5/125 �m	850 nm	Duplex LC
15500-XVRA-02C2	Fibre Channel (2 Gbps)³	MM 50/125 �m MM 62.5/125 �m	850 nm	Duplex LC
15500-XVRA-03B1	Gigabit Ethernet⁴, Fibre Channel (1 Gbps)⁵	SM 9/125 �m	1310 nm	Duplex LC
15500-XVRA-03B2	Fibre Channel (1 Gbps⁶ and 2 Gbps⁷)	SM 9/125 �m	1310 nm	Duplex LC
15500-XVRA-06B1	SONET OC-12 SR⁸, SDH STM-4	SM 9/125 �m	1310 nm	Duplex LC
15500-XVRA-07B1	SONET OC-48 SR, SDH STM-16	SM 9/125 �m	1310 nm	Duplex LC

¹1000BaseSX

²FC-0-100-M5-SN-S and FC-0-100-M6-SN-S standards

³FC-0-200-M5-SN-S and FC-0-200-M6-SN-S standards

⁴1000BaseLX

⁵FC-0-100-SM-LC-S standard

⁶FC-0-100-SM-LC-S standard

⁷FC-0-200-SM-LC-S standard

⁸SR = short range

The following protocols can be monitored with the extended range transponder modules:

ISC (compatibility mode only)The extended range transponder modules also support the OFC (open fiber control) safety protocol for Fibre Channel.

Mux/Demux Modules

The optical mux/demux modules multiplex signals received over the optical backplane from the transponder modules. The optical mux/demux modules also demultiplex the received signals from the trunk side.

Processor Cards

The Cisco ONS 15540 includes two processor cards for redundancy, one in active mode and the other in hot-standby mode. Each processor card is comprised of a number of subsystems, including a CPU, a clock subsystem, an Ethernet switch for communication between processors and with the LRC (line card redundancy controller) on the mux/demux and line card motherboards, and an SRC (switchcard redundancy controller). The active processor controls the system. All motherboards in the system use the system clock and synchronization signals from the active processor. Interfaces on the processor cards permit access by 10/100 Ethernet, console terminal, or modem connections.

Standards Compliance

For information on standards compliance for the Cisco ONS 15540, refer to the
Regulatory Compliance and Safety Information for the Cisco ONS 15540 ESP publication.

Cisco ONS 15540 Software Feature Overview

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Processor redundancy provided by arbitration of processor status and switchover in case of failure without loss of connections.

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Autosynchronization of startup and running configurations between redundant processor cards.

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Support for per-channel APS (Automatic Protection Switching) in point-to-point and ring topologies using redundant subsystems that monitor link integrity and signal quality.

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System configuration and management through the CLI (command-line interface), accessible through an Ethernet connection or console terminal.

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Optical power monitoring on the trunk side of the transponder module, digital monitoring on both client and trunk sides of the transponder module, and per-channel transponder module in-service and out-of-service loopback (client and trunk sides).

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Optional out-of-band management of other Cisco ONS 15540 systems on the network through the OSC (optical supervisory channel).

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Support for network management systems that use SNMP. Its capabilities include configuration management, fault isolation, topology discovery, and path trace.

Network Management Systems

The Cisco ONS 15540 is supported by the network management system CiscoWorks2000, which includes the following:

Optical Supervisory Channel

The Cisco ONS 15540 supports an optional out-of-band management channel for communicating between systems on the network. Using a 33rd wavelength (channel 0), the OSC allows control and management traffic to be carried without a separate Ethernet connection to each Cisco ONS 15540 in the network. The OSC always terminates on a neighboring node. By contrast, data channels may or may not be terminated on a given node, depending on whether the channels on the mux/demux modules are treated as either express (pass-through) or add/drop channels.

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CDP (Cisco Discovery Protocol) packets—Used to discover neighboring devices

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OSCP (OSC Protocol) packets—Used to determine whether the OSC link is up using a Hello protocol

Note

When the OSC is not present, Cisco ONS 15540 systems can be managed individually by separate Ethernet connections.

The OSC uses a dedicated laser and detector on a mux/demux motherboard. The OSC is a full duplex channel that can use a single ring for transmit and receive.

Online Diagnostics

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OIR (online insertion and removal) tests for motherboards, modules, and standby processors

For more information on using the online diagnostics, refer to the
Cisco ONS 15540 ESP Troubleshooting Guide.

Network Topologies

For more information on network topologies, refer to the Introduction to DWDM Technology publication and the Cisco ONS 15540 ESP Planning and Design Guide. Also, for information about configuring network topologies, see "Configuring Point-to-Point Topologies" and "Configuring Ring Topologies"

Table Of Contents

Product Overview