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This publication provides procedures for installing and connecting Optical Services Modules (OSMs) in Cisco 7600 series Internet Routers and Catalyst 6500 series switches.
The OSMs are supported in the Cisco 7600 series Internet Router and Catalyst 6500 series switches. The OSMs are supported with the following system configurations:
Refer to the Release Notes for Catalyst 6500 Series and Cisco 7600 Series Internet Router Software Release 6.x and the Release Notes for Catalyst 6500 Series and Cisco 7600 Series Internet Router for Cisco IOS Release 12.1E publications for complete information about the chassis, modules, software features, protocols, and MIBs supported by the OSMs.
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Note You can access release notes at the World Wide Web locations listed in the "Obtaining Documentation" section on page 28. |
This publication contains these sections:
Table 1 describes the Cisco 7600 series Internet Router and Catalyst 6500 series chassis.
Table 1 Cisco 7600 Series and Catalyst 6500 Series Chassis
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The OSMs are installed as follows:
The slot numbering is the same in the 3-slot, 6-slot chassis, and 13-slot chassis (see Figure 1)
The slot numbering is the same in the 6-slot, 9-slot, and 13-slot chassis (see Figure 2)
The horizontal slots are numbered from top to bottom; the vertical slots are numbered from right to left.
In all chassis, slot 1 is reserved for the supervisor engine. Slot 2 can contain an additional redundant supervisor engine in case the supervisor engine in slot 1 fails. If a redundant supervisor engine is not required, slot 2 is available for a module. Module filler plates, which are blank module carriers, are installed in empty slots to maintain consistent airflow through the chassis.
Table 2 lists the OSMs that are described in this publication.
Table 2 Optical Services Modules
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1 POS = Packet over SONET. 2 GBIC = Gigabit Interface Converters; GBICs are available in three styles (SX, LX/LH, and ZX) and have an SC connector for use with either MMF or SMF. 3 MMF = multimode fiber. 4 SMF = single-mode fiber. 5 DPT = Dynamic Packet Transport. 6 The channelized OSMs are supported only on the Cisco 7600 series Internet Router platform. 7 ATM = Asynchronous Transfer Mode. |
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Note You can locate software features in the Optical Services Module Software Configuration Note at the
following URL: http://www.cisco.com/univercd/cc/td/doc/product/core/cis7600/cfgnotes/osm_inst/index.htm |
The OSM hardware features include:
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Note The four Gigabit Ethernet ports on the OSM-4GE-WAN-GBIC WAN Services Module support forwarding of distributed IP services as well as Ethernet over Multiprotocol Label Switching (EoMPLS), Destination Sensitive Services (DSS), and Versatile Traffic Management and Shaping (VTMS). |
The following connectors and transceivers are used by the OSMs:
Safety warnings appear throughout this publication in procedures that, if performed incorrectly, may harm you. A warning symbol precedes each warning statement.
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Warning Before you install, operate, or service the system, read the Site Preparation and Safety Guide. This guide contains important safety information you should know before working with the system. |
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Warning Only trained and qualified personnel should be allowed to install, replace, or service this equipment. |
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Warning During this procedure, wear grounding wrist straps to avoid ESD damage to the card. Do not directly touch the backplane with your hand or any metal tool, or you could shock yourself. |
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Warning Blank faceplates and cover panels serve three important functions: they prevent exposure to hazardous voltages and currents inside the chassis; they contain electromagnetic interference (EMI) that might disrupt other equipment; and they direct the flow of cooling air through the chassis. Do not operate the system unless all cards, faceplates, front covers, and rear covers are in place. |
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Warning Because invisible radiation may be emitted from the aperture of the port when no fiber cable is connected, avoid exposure to radiation and do not stare into open apertures. |
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Warning Do not stare into the beam or view it directly with optical instruments. |
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Warning Avoid eye or skin exposure to direct or scattered radiation. |
These tools are required to install an OSM in the Cisco 7600 series Internet Router or Catalyst 6500 series switch:
Whenever you handle an OSM, always use a wrist strap or other grounding device to prevent electrostatic discharge (ESD). For information on preventing ESD, see the "Preventing ESD" section of the Site Preparation and Safety Guide.
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Warning Only trained and qualified personnel should be allowed to install, replace, or service this equipment. |
Before installing OSMs, you must install the Cisco 7600 series Internet Router or Catalyst 6500 series switch chassis and at least one supervisor engine.
For information on installing the chassis, refer to the Cisco 7603 and 7606 Internet Router Installation Guide, the Cisco 7609 Internet Router Installation Guide, or the Catalyst 6500 Series Installation Guide.
The OSMs are Class 1 laser products.
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Warning Because invisible radiation may be emitted from the aperture of the port when no fiber cable is connected, avoid exposure to radiation and do not stare into open apertures. |
This section describes how to install the OSMs in the Cisco 7600 series Internet Router and Catalyst 6500 series switches. Make sure that you have an open slot available for the new module.
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Caution To prevent ESD damage, handle modules by the carrier edges only. |
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Warning During this procedure, wear grounding wrist straps to avoid ESD damage to the card. Do not directly touch the backplane with your hand or any metal tool, or you could shock yourself. |
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Warning Because invisible laser radiation may be emitted from the aperture of the port when no cable is connected, avoid exposure to laser radiation and do not stare into open apertures. |
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Warning Only trained and qualified personnel should be allowed to install, replace, or service this equipment. |
To install an OSM in the Cisco 7600 series Internet Router or Catalyst 6500 series switch, perform these steps:
Step 2 Fully open both ejector levers on the OSM.
Step 3 Depending on the orientation of the slots in the chassis (horizontal or vertical), continue to either of these procedures:
a. Position the OSM in the slot. (See Figure 17.)
b. Carefully slide the OSM into the slot until the EMI gasket on the top edge of the module contacts the module in the slot above and both ejector levers have started to close.
c. Using the thumb and forefinger of each hand, simultaneously push in the left and right levers to fully seat the module in the backplane connector.
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Note Always use the ejector levers when installing or removing modules. A module that is partially seated in the backplane will cause the system to halt and subsequently crash. |
a. Position the OSM in the slot. (See Figure 18.)
b. Carefully slide the OSM into the slot until the EMI gasket on the right edge of the module contacts the module in the slot to the right and both ejector levers have started to close.
c. Using the thumb and forefinger of each hand, simultaneously push in the top and bottom levers to fully seat the OSM in the backplane connector.
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Note Always use the ejector levers when installing or removing the modules. A module that is partially seated in the backplane will cause the system to halt and subsequently crash. |
Step 4 Use a screwdriver to tighten the captive installation screws on the OSM.
This section describes the following topics:
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Warning If the symbol of suitability with an overlaid cross appears above a port, you must not connect the port to a public network that follows the European Union standards. Connecting the port to this type of public network can cause severe injury or damage your router. |
This section describes the types of connectors associated with the OSMs.
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Warning Because invisible laser radiation may be emitted from the aperture of the port when no cable is connected, avoid exposure to laser radiation and do not stare into open apertures. |
The SC-type connector (shown in Figure 19) is used to connect the OSMs to optical networks using both multimode fiber (MMF) and single-mode fiber (SMF).
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Warning Because invisible laser radiation may be emitted from the aperture of the port when no cable is connected, avoid exposure to laser radiation and do not stare into open apertures. |
The LC-type connector (shown in Figure 20) is used to connect the OC-48 DPT/POS, channelized OC-12, and channelized OC-48 OSMs to optical networks using both MMF and SMF.
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Warning Because invisible laser radiation may be emitted from the aperture of the port when no cable is connected, avoid exposure to laser radiation and do not stare into open apertures. |
MT-RJ connectors provide a high-density optical connection between the OSM and the network. (See Figure 21.) When you are connecting MT-RJ cables to a module, make sure you firmly press the connector plug into the socket. The upper edge of the plug must snap into the upper front edge of the socket. You may or may not hear an audible click. Gently pull on the plug to confirm whether or not the plug is locked into the socket.
Always make sure that you insert the connector completely into the socket. This step is especially important when you are making a connection between a module and a long distance (2 km) or a suspected highly attenuated network. If the link LED does not light, remove the network cable plug and reinsert it firmly into the module socket. Dirt or skin oils might have accumulated on the plug faceplate (around the optical-fiber openings) to generate significant attenuation, which reduces the optical power levels below threshold levels so that a link cannot be made.
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Caution When you disconnect the fiber-optic cable from the module, grip the body of the connector. Do not grip the connector jacket sleeve. Gripping the sleeve can, over time, degrade the fiber-optic cable termination in the MT-RJ connector. |
To disconnect the plug from the socket, press down on the raised portion on top of the plug (releasing the latch). You should hear an audible click indicating the latch has released. Carefully pull the plug out of the socket.
To clean the MT-RJ plug faceplate:
Step 2 Carefully wipe the faceplate with a dry lint-free tissue.
Step 3 Remove any residual dust from the faceplate with compressed air before installing the cable.
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Note Make sure that dust caps are installed on all unused module connectors and unused network fiber-optic cable connectors. |
The mini-SMB connector (shown in Figure 22) is used to connect the channelized DS3 OSMs to optical networks using RG-179 75-Ohm copper coax cable.
The following cable options are available:
This section describes these topics:
The specification for optical fiber transmission defines two types of fiber: single mode and multimode. Within the single-mode category, three transmission types are defined: short reach, intermediate reach, and long reach. Within the multimode category, only short reach is available.
Table 3 lists the specifications for OC-3, Table 4 lists the specifications for OC-12 OSM interfaces, and Table 5 lists the specifications for OC-48 OSM interfaces.
Table 3 OC-3 Fiber Interface Specifications
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Table 4 OC-12 Fiber Interface Specifications
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Table 5 OC-48 Fiber Interface Specifications
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Table 6 provides cabling specifications for the 1000BASE-X interfaces, including the Gigabit Ethernet GBIC interfaces. The minimum cable distance for all GBICs listed (MMF and SMF) is 6.5 feet (2 meters).
Table 6 Gigabit Ethernet Maximum Transmission Distances
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1 Number listed is core size. The cladding size is usually 125 microns. 2 MMF only. 3 Patch cord required. (See the "Patch Cord" section for details.) 4 ANSI/TIA/EIA-568-A specifies that the nominal "mode field diameter" shall be 8.7 to 10.0 microns with a tolerance of +/- 0.5 micron at 1310 nm. 5 You can have a maximum of 24 1000BASE-ZX GBICs per system to comply with FCC Class A. 6 Dispersion-shifted single-mode fiber-optic cable. 7 The minimum link distance for ZX GBICs is 6.2 miles (10 km) with an 8-dB attenuator installed at each end of the link. Without attenuators, the minimum link distance is 24.9 miles (40 km). |
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Warning Because invisible laser radiation may be emitted from the aperture of the port when no cable is connected, avoid exposure to laser radiation and do not stare into open apertures. |
The mode-conditioning patch cord (Cisco product no. CAB-GELX-625 or equivalent) prevents overdriving the receiver for short lengths of MMF and reduces differential mode delay for long lengths of MMF.
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Note The patch cord is required to comply with IEEE standards. IEEE found that link distances could not be met with certain types of fiber-optic cable due to a problem in the center of some fiber-optic cable cores. The solution is to launch light from the laser at a precise offset from the center by using the patch cord. At the output of the patch cord, the LX/LH GBIC complies with the IEEE 802.3z standard for 1000BASE-LX. For more information, see the "Differential Mode Delay" section 21. |
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Note Cisco Gigabit Ethernet products have been tested and evaluated to comply with the standards listed. Equivalent cables should also meet these standards. |
Figure 23 shows a typical configuration using the patch cord.
Plug the end of the patch cord labeled "To equipment" into the GBIC. (See Figure 24.) Plug the end labeled "To cable plant" into the patch panel. The patch cord is 9.84 feet (3 meters) long and has duplex SC-type male connectors at each end.
When an unconditioned laser source designed for operation on an SMF cable is directly coupled to an MMF cable, differential mode delay (DMD) might occur. DMD can degrade the modal bandwidth of the fiber-optic cable. This degradation causes a decrease in the link span (the distance between the transmitter and the receiver) that can be reliably supported.
The Gigabit Ethernet specification (IEEE 802.3z) outlines parameters for Ethernet communications at a gigabit-per-second rate. The specification offers a higher-speed version of Ethernet for backbone and server connectivity using existing deployed MMF cable by defining the use of laser-based optical components to propagate data over MMF cable.
Lasers function at the baud rates and longer distances required for Gigabit Ethernet. The 802.3z Gigabit Ethernet Task Force has identified the DMD condition that occurs with particular combinations of lasers and MMF cable. The results create an additional element of jitter that can limit the reach of Gigabit Ethernet over MMF cable.
With DMD, a single laser light pulse excites a few modes equally within an MMF cable. These modes, or light pathways, then follow two or more different paths. These paths might have different lengths and transmission delays as the light travels through the cable.
With DMD, a distinct pulse propagating down the cable no longer remains a distinct pulse or, in extreme cases, might become two independent pulses. Strings of pulses can interfere with each other making it difficult to recover data.
DMD does not occur in all deployed fibers; it occurs with certain combinations of worst-case fibers and worst-case transceivers. Gigabit Ethernet experiences this problem because of its very high baud rate and its long MMF cable lengths. SMF cable and copper cable are not affected by DMD.
MMF cable has been tested for use only with LED sources. LEDs can create an overfilled launch condition within the fiber-optic cable. The overfilled launch condition describes the way LED transmitters couple light into the fiber-optic cable in a broad spread of modes. The generated light that shines in multiple directions can overfill the existing cable space and excite a large number of modes, similar to a light bulb radiating light into a dark room. (See Figure 25.)
Lasers launch light in a more concentrated fashion. A laser transmitter couples light into only a fraction of the existing modes or optical pathways present in the fiber-optic cable. (See Figure 25.)
The solution is to condition the laser light launched from the source (transmitter) so it spreads the light evenly across the diameter of the fiber-optic cable making the launch look more like an LED source to the cable. The objective is to scramble the modes of light to distribute the power more equally in all modes and prevent the light from being concentrated in just a few modes.
An unconditioned launch, in the worst case, might concentrate all of its light in the center of the fiber-optic cable, exciting only two or more modes equally.
A significant variation in the amount of DMD is produced from one MMF cable to the next. No reasonable test can be performed to survey an installed cable plant to assess the effect of DMD.
The GBIC is a hot-swappable input/output device that plugs into a Gigabit Ethernet port, linking the module port with the fiber-optic network. There are two physical GBIC models available: one model has a locking handle that secures the GBIC in the module; the other model uses two clips, one on each side of the GBIC, that secure the GBIC in the module. GBICs are also available in three optical models. The three optical models differ in the distance that light can be sent through a fiber-optic network. The two physical models are shown in Figure 26. The three optical models are listed in Table 7.
When installing GBICs, do the following:
You can have a maximum of 24 1000BASE-ZX GBICs per system to comply with FCC Class A.
This section provides procedures for installing and removing a GBIC. For additional information on GBICs, refer to the Gigabit Interface Converter Installation Note.
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Note Refer to the "Working with Lasers" section in the Site Preparation and Safety Guide before proceeding. |
There are two methods of installation; the one you use depends on your GBIC model.
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Warning Because invisible laser radiation may be emitted from the aperture of the port when no cable is connected, avoid exposure to laser radiation and do not stare into open apertures. |
To install a GBIC that has clips, perform these steps:
Step 2 Check the label on the GBIC to verify that the GBIC is the correct model (SX, LX/LH, or ZX) for your network.
Step 3 Grip the sides of the GBIC with your thumb and forefinger and insert the GBIC into the module socket, as shown in Figure 27.
Step 4 Slide the GBIC through the flap covering the socket opening until you hear a click indicating the GBIC is locked into the slot.
Step 5 When you are ready to attach the network interface fiber-optic cable, remove the plug from the GBIC optical bore and save the plug for future use.
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Warning Because invisible laser radiation may be emitted from the aperture of the port when no cable is connected, avoid exposure to laser radiation and do not stare into open apertures. |
To install a GBIC that has a handle, perform these steps:
Step 2 Check the label on the GBIC to verify that the GBIC is the correct model (SX, LX/LH, or ZX) for your network.
Step 3 Remove the plug from the optical bore.
Step 4 Slide the GBIC into the module socket. (See Figure 28.) You can install the GBIC with the handle either up or down.
a. If the handle is up during insertion, you must lower the handle after insertion to lock the GBIC in place.
b. If the handle is down during insertion, you will hear a click that indicates that the GBIC is locked in place.
Step 5 Verify that the GBIC handle is in the down position.
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Warning Because invisible laser radiation may be emitted from the aperture of the port when no cable is connected, avoid exposure to laser radiation and do not stare into open apertures. |
If you are removing a GBIC that has clips, perform these steps:
Step 2 Release the GBIC from the slot by simultaneously squeezing the two plastic tabs (one on each side of the GBIC).
Step 3 Slide the GBIC out of the Gigabit Ethernet module slot.
A flap drops down to protect the Gigabit Ethernet module connector.
Step 4 Place the GBIC in an antistatic bag.
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Warning Because invisible laser radiation may be emitted from the aperture of the port when no cable is connected, avoid exposure to laser radiation and do not stare into open apertures. |
If you are removing a GBIC with a handle, perform these steps:
Step 2 Rotate the handle up to release the GBIC from the slot.
Step 3 Grip the handle or the sides of the GBIC and slide the GBIC out of the slot.
A flap drops down to protect the slot.
Step 4 Place the GBIC in an antistatic bag.
Enter the show module command to verify that the system acknowledges the new modules and has brought them online.
This example shows the output of the show module command:
For more detailed installation and configuration information, refer to the following publications:
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Copyright © 2002, Cisco Systems, Inc.
All rights reserved.
Posted: Thu Oct 16 05:17:51 PDT 2003
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