Cisco PA-F/FD-MM Operating and maintenance instructions

1
Doc. No.
Copyright © 1995
Cisco Systems, Inc.
All rights reserved.
PA-F/FD-SM and PA-F/FD-MM Full-Duplex FDDI
Port Adapter Installation and Configuration
Product Numbers: PA-F/FD-MM(=), PA-F/FD-SM(=), and CAB-FMDD=
This configuration note describes the installation and configuration of the full-duplex Fiber
Distributed Data Interface (FDDI) port adapters (PA-F/FD-SM and PA-F/FD-MM), which are used
on the second-generation Versatile Interface Processor (VIP2) in all Cisco 7500 series routers, and
in Cisco 7000 series routers using the 7000 Series Route Switch Processor (RSP7000) and
7000 Series Chassis Interface (RSP7000CI). (Refer to the section “Software and Hardware
Requirements” on page 3.)
Note Use this configuration note in conjunction with the configuration note Second-Generation
Versatile Interface Processor (VIP2) Installation and Configuration (Document Number
78-2658-xx), which shipped with your VIP2.
Document Contents
This configuration note is organized into the following sections.
•If You Need More Information, page 2
•Port Adapter Installation Prerequisites, page 3
•What Is the FDDI Port Adapter?, page 11
•VIP2 and Full-Duplex FDDI Port Adapters, page 15
•Translated Safety Warnings, page 33
•Cisco Connection Online, page 35
78-3851-01

2PA-F/FD-SM and PA-F/FD-MM Full-Duplex FDDI Port Adapter Installation and Configuration
If You Need More Information
If You Need More Information
The Cisco Internetwork Operating System (Cisco IOS) software running the router contains
extensive features and functionality. The effective use of many of many of these features is easier if
you have more information at hand. For additional information on configuring the Cisco 7000 series
and Cisco 7500 series routers and VIP2, the following documentation resources are available:
•Cisco Connection Documentation, Enterprise Series CD-ROM
This publication and additional Cisco Systems publications are available on a CD-ROM called
Cisco Connection Documentation, Enterprise Series, which is Cisco’s online library of product
information. The CD-ROM is updated and shipped monthly, so it might be more up to date than
printed documentation. To order Cisco Connection Documentation, Enterprise Series CD-ROM,
contact a Cisco Sales or Customer Service representative.
•Refer to the following modular configuration and modular command reference publications, as
appropriate for your configuration:
—Configuration Fundamentals Configuration Guide
—Configuration Fundamentals Command Reference
—Wide-Area Networking Configuration Guide
—Wide-Area Networking Command Reference
—Network Protocols Configuration Guide
—Network Protocols Command Reference
—Bridging and IBM Networking Configuration Guide
—Bridging and IBM Networking Command Reference
—Configuration Builder Getting Started Guide
—Troubleshooting Internetworking Systems
•For hardware installation and maintenance information on the Cisco 7000 series and Cisco 7500
series routers, and the VIP2, refer to the following publications:
—Cisco 7000 Hardware Installation and Maintenance
—Cisco 7010 Hardware Installation and Maintenance
—Cisco 7505 Hardware Installation and Maintenance
—Cisco 7507 Hardware Installation and Maintenance
—Cisco 7513 Hardware Installation and Maintenance
—Second-Generation Versatile Interface Processor (VIP2) Installation and Configuration
•To obtain general information about documentation, refer to the Cisco Connection
Documentation, Enterprise Series CD-ROM, to the section “Cisco Connection Online,” on
page 35, or call Customer Service at 800 553-6387 or 408 526-7208. Customer Service hours are
5:00 a.m. to 6:00 p.m. Pacific time, Monday through Friday (excluding company holidays). You
can also send e-mail to [email protected]. You can also refer to the Cisco Information Packet
that shipped with your router.

PA-F/FD-SM and PA-F/FD-MM Full-Duplex FDDI Port Adapter Installation and Configuration 3
Port Adapter Installation Prerequisites
Port Adapter Installation Prerequisites
This section provides software requirements, a list of parts and tools you will need to perform the
port adapter installation, and safety and ESD-prevention guidelines to help you avoid injury and
damage to the equipment during installation. Also included is information on the systems in which
port adapters can be installed and overview information on interface specifications. The following
sections discuss general information and information about port adapter installation requirements:
•Software and Hardware Requirements
•Verifying Full-Duplex Port Adapter Capability in Your Router
•List of Parts and Tools, page 4
•Safety Guidelines, page 4
•FDDI Overview, page 6
•Optical Bypass Overview, page 8
•FDDI Full-Duplex Overview, page 9
•FDDI Specifications, page 9
Software and Hardware Requirements
The full-duplex FDDI port adapters (PA-F/FD-SM and PA-F/FD-MM) require that the host
Cisco 7000 series or Cisco 7500 series router is running Cisco IOS Release 11.1(6)CA, or later.
Caution The VIP2 requires that the Cisco 7000 series router has the RSP7000 and RSP7000CI
installed. The VIP2 will not operate properly with the Route Processor (RP), Switch Processor (SP),
or Silicon Switch Processor (SSP) installed in the Cisco 7000 series router.
Note Themaximumtransmissionunit(MTU)sizesavailable might require additional VIP2 SRAM
to ensure adequate buffers when two FDDI port adapters, one FDDI and one 4T, or one FDDI and
one 4R port adapter are installed on a VIP2. We recommend the VIP2-20 (with 1 MB of SRAM and
16 MB of DRAM) for use with any combination of two of these port adapters on a VIP2. The
minimum recommended VIP2 model is a VIP2-10 (with 512 KB of SRAM and 8 MB of DRAM),
if you only have one FDDI port adapter on a VIP2.
Verifying Full-Duplex Port Adapter Capability in Your Router
The PA-F/FD-SM and PA-F/FD-MM FDDI port adapters support full-duplex operation. (The
PA-F-SM and PA-F-MM FDDI port adapters do not support full-duplex operation.) To determine
which FDDI port adapters are installed in your system, use the show diagbus command and verify
that the PA-F/FD-SM or PA-F/FD-MM port adapters are installed. (For an example of the
show diagbus command, refer to the section “Using show Commands to Display Interface
Information,” which begins on page 29.)
If you discover that you do not have the appropriate Cisco IOS release and PA-F/FD-SM or
PA-F/FD-MM full-duplex FDDI port adapters installed on your VIP2, you cannot configure your
full-duplex operation. You require a minimum Cisco IOS release and PA-F/FD-MM or
PA-F/FD-SM for full-duplex operation. For specific full-duplex configuration requirements, refer to
the section “Configuring Full-Duplex Operation” on page 27.

4PA-F/FD-SM and PA-F/FD-MM Full-Duplex FDDI Port Adapter Installation and Configuration
Port Adapter Installation Prerequisites
List of Parts and Tools
You need the following tools and parts to install a port adapter. If you need additional equipment,
contact a service representative for ordering information.
•PA-F/FD-SM(=) or PA-F/FD-MM(=) full-duplex FDDI port adapters and at least one of the
following:
—VIP2-10(=)—if you will install only one FDDI port adapter on the VIP2
—VIP2-20(=) or VIP2-40(=)—if you will install two FDDI port adapters on the VIP2 (Refer
to the section “Software and Hardware Requirements” on page 3.)
•Cables appropriate for the port adapter interfaces (Single-mode, SC-type simplex or duplex,
optical-fiber cables and multimode optical-fiber cables with media interface connectors [MICs]
are not available from Cisco Systems; they are available from outside commercial cable
vendors.)
•Number 1 Phillips and a 3/16-inch, flat-blade screwdriver (for VIP2 installation only)
•Your own ESD-prevention equipment or the disposable grounding wrist strap included with all
upgrade kits, FRUs, and spares
Safety Guidelines
Following are safety guidelines that you should follow when working with any equipment that
connects to electrical power or telephone wiring, or that uses a laser for data transmission.
Laser Safety Guidelines
The single-mode aperture port contains an FDDI laser warning label, as shown in Figure 1.
Figure 1 Laser Warning Labels on PA-F/FD-SM
Warning Invisible laser radiation may be emitted from the aperture ports of the single-mode FDDI
products when no fiber cable is connected. Avoid exposure and do not stare into open apertures. (For
translated versions of this warning, refer to the section “Translated Safety Warnings” on page 33.)
Warning Class 1 laser product. (For translated versions of this warning, refer to the section
“Translated Safety Warnings” on page 33.”)
PRODUIT LASER DE CLASSE 1
CLASS 1 LASER PRODUCT
LASERPRODUKT DER KLASSE 1
PRODUCTO LASER CLASE 1
1
H6655

PA-F/FD-SM and PA-F/FD-MM Full-Duplex FDDI Port Adapter Installation and Configuration 5
Port Adapter Installation Prerequisites
Electrical Equipment Guidelines
Follow these basic guidelines when working with any electrical equipment:
•Before beginning any procedures requiring access to the chassis interior, locate the emergency
power-off switch for the room in which you are working.
•Disconnect all power and external cables before moving a chassis.
•Do not work alone when potentially hazardous conditions exist and never assume that power has
been disconnected from a circuit; always check.
•Do not perform any action that creates a potential hazard to people or makes the equipment
unsafe. Carefully examine your work area for possible hazards such as moist floors, ungrounded
power extension cables, and missing safety grounds.
Telephone Wiring Guidelines
Use the following guidelines when working with any equipment that is connected to telephone
wiring or to other network cabling:
•Never install telephone wiring during a lightning storm.
•Never install telephone jacks in wet locations unless the jack is specifically designed for wet
locations.
•Never touch uninsulated telephone wires or terminals unless the telephone line has been
disconnected at the network interface.
•Use caution when installing or modifying telephone lines.
Preventing Electrostatic Discharge Damage
Electrostatic discharge (ESD) damage, which can occur when electronic cards or components are
improperlyhandled,resultsincompleteorintermittentfailures.Portadaptersandprocessormodules
consists of printed circuit boards that are fixed in metal carriers. Electromagnetic interference (EMI)
shielding and connectors are integral components of the carrier. Although the metal carrier helps to
protect the board from ESD, use a preventive antistatic strap during handling.
Following are guidelines for preventing ESD damage:
•Always use an ESD wrist or ankle strap and ensure that it makes good skin contact.
•Connect the equipment end of the strap to an unfinished chassis surface.
•When installing a component, use any available ejector levers or captive installation screws to
properly seat the bus connectors in the backplane or midplane. These devices prevent accidental
removal, provide proper grounding for the system, and help to ensure that bus connectors are
properly seated.
•When removing a component, use any available ejector levers or captive installation screws to
release the bus connectors from the backplane or midplane.
•Handle carriers by available handles or edges only; avoid touching the printed circuit boards or
connectors.
•Place a removed component board-side-up on an antistatic surface or in a static shielding
container. If you plan to return the component to the factory, immediately place it in a static
shielding container.

6PA-F/FD-SM and PA-F/FD-MM Full-Duplex FDDI Port Adapter Installation and Configuration
Port Adapter Installation Prerequisites
•Avoid contact between the printed circuit boards and clothing. The wrist strap only protects
components from ESD voltages on the body; ESD voltages on clothing can still cause damage.
•Never attempt to remove the printed circuit board from the metal carrier.
Caution For safety, periodically check the resistance value of the antistatic strap. The
measurement should be between 1 and 10 megohms.
FDDI Overview FDDI, which specifies a 100-Mbps, wire-speed, token-passing dual-ring network using fiber-optic
transmission media, is defined by the ANSI X3.1 standard and by ISO 9314, the international
version of the ANSI standard. An FDDI network comprises two token-passing fiber-optic rings: a
primary ring and a secondary ring.
Aring consists of two or more point-to-point connections between adjacent stations. On most
networks, the primary ring is used for data communication, and the secondary ring is used as a
backup. Single attachment stations attach to one ring and are typically attached through a
concentrator; Class A, or dual attachment stations (DASs), attach to both rings.
Figure 2 shows a typical FDDI configuration with both dual-attached and single-attached
connections. Single attachment stations typically attach to the primary ring through a concentrator,
which provides connections for multiple single-attached devices. The concentrator ensures that a
failure or power down of any single attachment station does not interrupt the ring. Single attachment
stations use one transmit port and one receive port to attach to the single ring. DASs (Class A) have
two physical ports, designated PHY A and PHY B, each of which connects the station to both the
primary and secondary rings. Each port is a receiver for one ring and a transmitter for the other. For
example, PHY A receives traffic from the primary ring, and PHY B transmits to it.
Figure 2 Typical Configuration with DAS, Concentrator, and Single Attachment
SAS SAS SAS
DAS
FDDI
H1553a
Concentrator

PA-F/FD-SM and PA-F/FD-MM Full-Duplex FDDI Port Adapter Installation and Configuration 7
Port Adapter Installation Prerequisites
The dual rings in an FDDI network provide fault tolerance. If a station on a dual ring shuts down or
fails, such as Station 3 in Figure 3, the ring automatically wraps (doubles back on itself) to form a
single contiguous ring. This removes the failed station from the ring, but allows the other stations to
continue operation. In Figure 3, the ring wraps to eliminate Station 3 and forms a smaller ring that
includes only Stations 1, 2, and 4. A second failure could cause the ring to wrap in both directions
from the point of failure, which would segment the ring into two separate rings that could not
communicate with each other.
Figure 3 DAS Station Failure and Ring Recovery Example
For example, if Station 1 in Figure 3 fails after Station 3 fails, Stations 2 and 4 will each be isolated
because no path for communication exists between them. Subsequent failures cause additional
segmentation.
Station 4
Station 3
Station 2
Station 1
Ring wrap Ring wrap
B
AMAC
B
A
MAC
BA
BA
MAC
Failed station
H1589a

8PA-F/FD-SM and PA-F/FD-MM Full-Duplex FDDI Port Adapter Installation and Configuration
Port Adapter Installation Prerequisites
Optical Bypass Overview
Optical bypass switching avoids segmentation by eliminating failed stations from the ring. An
optical bypass switch allows the light signal to pass directly through it, completely bypassing the
failed or shut down station.
Note For example, if an optical bypass switch had been installed at Station 3 in the example ring
inFigure 3, it would have allowedthelightsignalto pass through the switch andmaintain its existing
path and direction without wrapping back on itself.
The FDDI port adapters have an optical bypass switch feature by way of a DIN connection. Optical
bypass switches avoid segmentation by eliminating failed stations from the ring. During normal
operation, an optical bypass switch allows the light signal to pass uninterrupted directly through
itself. When a station with a bypass switch fails, the bypass switch reroutes the signal back onto the
ring before it reaches the failed station, so the ring does not have to wrap back on itself.
Figure 4 shows an optical bypass switch installed at Station 1. In the normal configuration shown,
Station 1 is functioning normally, so the optical bypass switch appears transparent. The switch
essentially allows the signals to pass through it without interruption. However, if Station 1 fails, the
optical bypass switch enables the bypassed configuration shown on the right in Figure 4.
Figure 4 Optical Bypass Operation on a DAS
Station 4
Station 3
Station 2
Station 1
BA
B
A
B
A
Optical bypass switch
“normal configuration”
A
B
Station 4
Station 3
Station 2
BA
B
A
B
A
Failed station
Station 1
Optical bypass switch
“bypassed configuration”
Ring does not wrap
A
B
H1863

PA-F/FD-SM and PA-F/FD-MM Full-Duplex FDDI Port Adapter Installation and Configuration 9
Port Adapter Installation Prerequisites
The optical bypass switch reroutes the light signal by intercepting it before it reaches the failed
Station 1 and sends it back out to the ring. This allows the signal to maintain its existing path and
direction without wrapping back on itself. However, stations that are operating normally repeat the
signal when sending it back out to the ring. Optical bypass switches do not repeat or drive the signal
(they just allow the signal to pass through them), so significant signal loss can occur when the
downstream neighbor (the next station on the ring) is far away.
Another technique for fault tolerance is dual homing, whereby critical devices are attached to two
concentrators. Only the designated primary concentrator is active unless it (or its link) fails. If the
primary does fail, the backup (passive) concentrator is automatically activated and sustains the ring.
FDDI Full-Duplex Overview
FDDI full-duplex allows an FDDI ring with exactly two stations to transform the ring into a
full-duplex, point-to-point topology.
In order to operate in full-duplex mode, there must be only two stations on the ring, the two stations
must be capable of operating in full-duplex mode, and both stations must complete a full-duplex
auto-configuration protocol. There is no FDDI token in full-duplex mode.
Full-duplex auto-configuration protocol allows a station to dynamically and automatically operate
in either half-duplex (or ring) or full-duplex mode, and ensures that the stations fall back to ring
mode when a configuration change occurs, such as a third station joining the ring.
After booting up, the stations begin operation in ring mode. While the station performs the
full-duplex auto-configuration protocol, the station continues to provide data link services to its
users. Under normal conditions, the transition between half-duplex mode and full-duplex mode is
transparent to the data-link users. The data-link services provided by full-duplex mode are
functionally the same as the services provided by half-duplex mode.
FDDI Specifications
Typically, FDDI uses two types of fiber-optic cable:
•Single-mode (also called monomode) optical fiber with SC-type, duplex and simplex connectors
•Multimode optical fiber with MICs
Mode refers to the angle at which light rays (signals) are reflected and propagated through the optical
fiber core, which acts as a waveguide for the light signals. Multimode fiber has a relatively thick core
(62.5/125-micron) that reflects light rays at many angles. Single-mode fiber has a narrow core (8.7
to 10/125-micron) that allows the light to enter only at a single angle.
Although multimode fiber allows more light signals to enter at a greater variety of angles (modes),
the different angles create multiple propagation paths that cause the signals to spread out in time and
limits the rate at which data can be accurately received. This distortion does not occur on the single
path of the single-mode signal; therefore, single-mode fiber is capable of higher bandwidth and
greater cable run distances that multimode fiber. In addition, multimode transmitters usually use
LEDs as a light source, and single-mode transmitters use a laser diode, which is capable of
sustaining faster data rates. Both types use a photodiode detector at the receiver to translate the light
signal into electrical signals.
The FDDI standard sets total fiber lengths of 1.2 miles (2 kilometers) for multimode fiber and
9.3 miles (15 kilometers) for single-mode fiber. (The maximum circumference of the FDDI network
is only half the specified distance because of signal wrapping or loopback that occurs during fault
correction.) The FDDI standard allows a maximum of 500 stations with a maximum distance
between active stations of 1.2 miles.

10 PA-F/FD-SM and PA-F/FD-MM Full-Duplex FDDI Port Adapter Installation and Configuration
Port Adapter Installation Prerequisites
Table 1 lists the signal descriptions for the mini-DIN optical bypass switch available on the FDDI
port adapters. The mini-DIN-to-DIN adapter cable (CAB-FMDD=) allows connection to an optical
bypass switch with a DIN connector (which is larger than the mini-DIN connector on the FDDI port
adapters).
Table 1 Optical Bypass Switch Pinout
Note Up to 160 milliamperes (mA) of current can be supplied to the optical bypass switch.
The FDDI port adapter implementation complies with Version 6.1 of the X3T9.5 FDDI
specification, offering a Class A dual attachment interface that supports the fault-recovery methods
of DAS. The FDDI port adapter supports dual homing and optical bypass and complies with ANSI
X3.1 and ISO 9314 FDDI standards.
Maximum Transmission Distances for FDDI Connections
The maximum transmission distances for single-mode and multimode FDDI stations are shown in
Table 2. Ifthe distance between twoconnectedstations is greater than themaximum distance shown,
significant signal loss can result.
Table 2 FDDI Maximum Transmission Distances
FDDI Port Adapter Optical Power Parameters
The multimode and single-mode optical-fiber connections conform to the following optical power
parameters:
•Output power: –19 to –14 dBm
•Input power: –31 to –14 dBm
•Input sensitivity: –31 dBm @ 2.5x10–10 BER @ 125 Mbps
Pin Direction Description
1 Out +5V to secondary switch
2 Out +5V to primary switch
3 Out Enable optical bypass switch primary
4 Out Enable optical bypass switch secondary
5 In Sense optical bypass switch—1 kohm to +5 V
6 Out Ground—Sense optical bypass switch return
Transceiver Type Maximum Distance Between Stations
Single-mode Up to 9.3 miles (up to 15 km)
Multimode Up to 1.2 miles (up to 2 km)

PA-F/FD-SM and PA-F/FD-MM Full-Duplex FDDI Port Adapter Installation and Configuration 11
What Is the FDDI Port Adapter?
What Is the FDDI Port Adapter?
The FDDI full-duplex port adapters provide an interface for both single-mode and multimode
fiber-optic cable. The two physical ports (PHY A and PHY B) are available with either single-mode
(SC) or multimode MIC receptacles. Each port adapter’s FDDI connection allows a maximum
bandwidth of 100 Mbps per the FDDI standard.
The following FDDI port adapter combinations are available:
•PA-F/FD-MM—FDDI PHY-A multimode, PHY-B multimode port adapter with optical bypass
switch capability and full-duplex capability (see Figure 5)
•PA-F/FD-SM—FDDIPHY-Asingle-mode,PHY-B single-mode port adapter with optical bypass
switch capability and full-duplex capability (see Figure 6)
Figure 5 FDDI Port Adapter PA-F/FD-MM, Faceplate View
Figure 6 FDDI Port Adapter PA-F/FD-SM, Faceplate View
Warning Invisible laser radiation may be emitted from the aperture ports of the single-mode FDDI
products when no fiber cable is connected. Avoid exposure and do not stare into open apertures. (For
translated versions of this warning, refer to the section “Translated Safety Warnings.”)
The FDDI port adapters can be installed on the VIP2 in port adapter slot 0 and port adapter slot 1.
Port adapters have a handle attached, but this handle is occasionally not shown in this publication to
allow a full view of detail on the port adapter’s faceplate.
The following sections discuss information specific to the FDDI port adapter:
•Port Adapter Locations on the VIP2, page 12
•FDDI Port Adapter LEDs, page 12
•FDDI Port Adapter Fiber-Optic Cables, page 13
•Attaching FDDI Port Adapter Cables, page 21
•Attaching an Optical Bypass Switch, page 22
•Configuring the FDDI Port Adapter Interfaces, page 24
—Selecting Chassis Slot, Port Adapter, and FDDI Port Numbers, page 24
—Checking the Configuration, page 28
H7585
ENABLED PHY A PHY B DUAL HOMED
BYPASS
PA-MM-FD
PHY A PHY B
PA-SM-FD
H7586
ENABLED PHY A
PHY A
RCVR XMTR RCVR XMTR PHY B
PHY B DUAL HOMED
BYPASS
PRODUIT LASER DE CLASSE 1
CLASS 1 LASER PRODUCT
LASERPRODUKT DER KLASSE 1
PRODUCTO LASER CLASE 1
1

12 PA-F/FD-SM and PA-F/FD-MM Full-Duplex FDDI Port Adapter Installation and Configuration
What Is the FDDI Port Adapter?
Port Adapter Locations on the VIP2
Figure 7 shows a VIP2 with installed port adapters. With the VIP2 oriented as shown in Figure 7,
the left port adapter is in port adapter slot 0, and the right port adapter is in port adapter slot 1. Port
adapters have handles that allow for easy installation and removal; however, they are occasionally
not shown in this publication to highlight port adapter faceplate detail. In the Cisco 7000,
Cisco 7507, and Cisco 7513 chassis the VIP2 is installed vertically. In the Cisco 7010 and
Cisco 7505 chassis the VIP2 is installed horizontally.
Figure 7 Port Adapters on the VIP2 (Horizontal Orientation Shown)
FDDI Port Adapter LEDs
The FDDI port adapter contains the enabled LED, standard on all port adapters, and status LEDs for
eachport.After system initialization, the enabled LEDgoeson to indicate that the FDDIportadapter
has been enabled for operation. (The LEDs are shown in Figure 8.)
Note The LEDs on both full-duplex FDDI port adapters are identical to the LEDs shown in
Figure 8 and described in Table 3 on page 13.
Figure 8 LEDs on the FDDI Port Adapter (Partial Faceplate Shown)
H6448
DRAM
SIMMs
Port adapter
in slot 0
Port adapter
slot 1
SRAM
DIMM U5
CPU Boot ROM
Bus connector
U6
U4 U2
PAI-SM-FD
H7972
ENABLED PHY A PHY B DUAL HOMED

PA-F/FD-SM and PA-F/FD-MM Full-Duplex FDDI Port Adapter Installation and Configuration 13
What Is the FDDI Port Adapter?
The following conditions must be met before the enabled LED goes on:
•The FDDI port adapter is correctly connected and receiving power.
•TheFDDI-equippedcardorchassis contains a validmicrocodeversionthathasbeendownloaded
successfully.
•The bus recognizes the FDDI-equipped card or chassis.
If any of these conditions is not met, or if the initialization fails for other reasons, the enabled LED
does not go on. In addition to the enabled LED, the FDDI port adapter has the following three LEDs:
•PHY A—This green LED is on when the PHY A connection is active on the FDDI ring
•PHY B—This green LED is on when the PHY B connection is active on the FDDI ring.
•DUAL HOMED—This green LED is on when the FDDI station is dual homed.
The states of the port adapter’s LED combinations, and the meanings of each are described in
Table 3.
Table 3 FDDI Port Adapter LED States (Refer to Figure 8)
FDDI Port Adapter Fiber-Optic Cables
The interface receptacles on the FDDI port adapter are MICs for multimode and SC-type connectors
for simplex and duplex, single-mode applications. The multimode receptacle is an FDDI-standard
physical sublayer (PHY) connector that encodes and decodes the data into a format acceptable for
fiber transmission. The multimode receptacle accepts standard 62.5/125-micron, multimode
fiber-optic cable using the MIC and, with proper cable terminators, can accept 50/125 micron
fiber-optic cable.
Note Fiber-optic cables are commercially available; they are not available from Cisco Systems.
1. For the LED patterns “—” means off, “O” means on. Refer also to Figure 8.
FDDI PA LEDs1Indication
PHY A PHY B Dual-Homed
— — — Not connected
— — O Not possible
— O — Wrap B
— O O Dual homed (B connected to M port)
O — — Wrap A
O — O Dual homing back-up (A connected to M port; B port
is not connected
O O — Thru A
O O O Not possible

14 PA-F/FD-SM and PA-F/FD-MM Full-Duplex FDDI Port Adapter Installation and Configuration
What Is the FDDI Port Adapter?
Multimode uses the integrated MIC shown in Figure 9, at both the port adapter end and the network
end.
Figure 9 Multimode FDDI Network Interface MIC
For FDDI single-mode connections, use one duplex SC connector (see Figure 10) or two single SC
connectors, at both the port adapter end and the network end. (See Figure 11.) Single-mode optical
fiber cable has a narrow core (8.7 to 10/125-micron), which allows the light to enter only at a single
angle.
Figure 10 Duplex SC Connector
Figure 11 Simplex SC Connector
Warning Invisible laser radiation may be emitted from the aperture ports of the single-mode FDDI
products when no fiber cable is connected. Avoid exposure and do not stare into open apertures. (For
translated versions of this warning, refer to the section “Translated Safety Warnings.”)
H1349a
H2214
H2399

PA-F/FD-SM and PA-F/FD-MM Full-Duplex FDDI Port Adapter Installation and Configuration 15
VIP2 and Full-Duplex FDDI Port Adapters
VIP2 and Full-Duplex FDDI Port Adapters
The full-duplex FDDI port adapters are used on the VIP2, and can be installed in either port adapter
slot 0 or port adapter slot 1. There are two full-duplex FDDI port adapters: PA-F/FD-MM and
PA-F/FD-SM.
PA-F/FD-MM uses multimode MIC optical-fiber interface connections, and PA-F/FD-SM uses
single-mode SC-type optical-fiber interface connections. Both PA-F/FD-MM and PA-F/FD-SM
have optical bypass switching capability in the form of a mini-DIN connector.
Figure 12 shows PA-F/FD-SM port adapters installed on a VIP2 in port adapter slots 0 and 1.
Figure 12 VIP2 with PA-F/FD-SM Port Adapters in Port Adapter Slots 0 and 1
Note Port adapters have a handle attached, but this handle is not shown to allow a full view of detail
on each port adapter’s faceplate.
FDDI-MM
H6475
Port adapter
slot 0
Port adapter handles not shown
Port adapter
slot 1
Bus connector
ENABLED PHY A
PHY A
PHY B
PHY B DUAL HOMED
FDDI-MM
ENABLED PHY A
PHY A
PHY B
PHY B DUAL HOMED
ENABLED
PHY A
PHY B
BYPASS
DUAL HOMED
BYPASS BYPASS
DRAM
SIMMs
SRAM
DIMM U5
CPU Boot ROM
U6
U2
U4

16 PA-F/FD-SM and PA-F/FD-MM Full-Duplex FDDI Port Adapter Installation and Configuration
VIP2 and Full-Duplex FDDI Port Adapters
Figure 13 shows PA-F/FD-MM port adapters installed on a VIP2 in port adapter slots 0 and 1.
Figure 13 VIP2 with Two PA-F/FD-MM Port Adapters in Port Adapter Slots 0 and 1
The following sections include information specific to the full-duplex FDDI port adapters and their
use on the VIP2 in Cisco 7000 series and Cisco 7500 series routers:
•Installing or Replacing a Port Adapter on a VIP2, page 17
•Attaching FDDI Port Adapter Cables, page 21
•Attaching an Optical Bypass Switch, page 22
•Configuring the FDDI Port Adapter Interfaces, page 24
PA-FDDI-MM
H6478
Port adapter
slot 0 Port adapter
slot 1
Bus connector
ENABLED PHY A
PHY A BYPASS BYPASS PHY B PHY A
PHY B DUAL HOMED
PA-FDDI-MM
ENABLED PHY A
PHY B
PHY B DUAL HOMED
DRAM
SIMMs
SRAM
DIMM U5
Boot ROM
U6
U2
U4
ENABLED
PHY A
PHY B
BYPASS
DUAL HOMED
Port adapter handles not shown
CPU

PA-F/FD-SM and PA-F/FD-MM Full-Duplex FDDI Port Adapter Installation and Configuration 17
VIP2 and Full-Duplex FDDI Port Adapters
Installing or Replacing a Port Adapter on a VIP2
Depending on the circumstances, you might need to install a new port adapter on a VIP2
motherboard or replace a failed port adapter in the field. In either case, you need a number 1 Phillips
screwdriver, an antistatic mat onto which you can place the removed interface processor, and an
antistatic container into which you can place a failed port adapter for shipment back to the factory.
Caution To prevent system problems, do not remove port adapters from the VIP2 motherboard, or
attempt to install other port adapters on the VIP2 motherboard while the system is operating. To
install or replace port adapters, first remove the VIP2 from its interface processor slot.
Note Each port adapter circuit board is mounted to a metal carrier and is sensitive to ESD damage.
The following procedures should be performed by a Cisco-certified service provider only. While the
VIP2 supports online insertion and removal (OIR), individual port adapters do not. To replace port
adapters, you must first remove the VIP2 from the chassis, then install or replace port adapters as
required. If a blank port adapter is installed on the VIP2 in which you want to install a new port
adapter, you must first remove the VIP2 from the chassis, then remove the blank port adapter.
When only one port adapter is installed on a VIP2, a blank port adapter must fill the empty slot to
allow the VIP2 and router chassis to conform to electromagnetic interference (EMI) emissions
requirements, and so that air flows through the chassis properly. If you plan to install a new port
adapter, you must first remove the blank port adapter.
Following is the standard procedure for removing and replacing any type of port adapter on the
VIP2:
Step 1 Attach an ESD-preventive wrist strap between you and an unfinished chassis surface.
Step 2 For a new port adapter installation or a port adapter replacement, disconnect any interface
cables from the ports on the front of the port adapter, although this is not required. You can
remove VIP2s with cables attached; however, we do not recommend it.
Step 3 To remove the VIP2 from the chassis, follow the steps in the section “Removing a VIP2”
in the configuration note Second-Generation Versatile Interface Processor (VIP2)
Installation and Configuration (Document Number 78-2658-xx), which shipped with your
VIP2.
Step 4 Place the removed VIP2 on an antistatic mat.

18 PA-F/FD-SM and PA-F/FD-MM Full-Duplex FDDI Port Adapter Installation and Configuration
VIP2 and Full-Duplex FDDI Port Adapters
Step 5 Locate the screw at the rear of the port adapter (or blank port adapter) to be replaced. (See
Figure 14.) This screw secures the port adapter (or blank port adapter) to its slot.
Figure 14 Location of Port Adapter Screw, Partial Port Adapter View
Step 6 Remove the screw that secures the port adapter (or blank port adapter).
Step 7 With the screw removed, grasp the handle on the front of the port adapter (or blank port
adapter) and carefully pull it out of its slot, away from the edge connector at the rear of the
slot. (See Figure 15.)
Figure 15 Pulling a Port Adapter Out of a Slot, Partial Port Adapter View
Step 8 If you removed a port adapter, place it in an antistatic container for safe storage or shipment
back to the factory. If you removed a blank port adapter, no special handling is required;
however, store the blank port adapter for potential future use.
H3148
Screw
H3149

PA-F/FD-SM and PA-F/FD-MM Full-Duplex FDDI Port Adapter Installation and Configuration 19
VIP2 and Full-Duplex FDDI Port Adapters
Step 9 Remove the new port adapter from its antistatic container and position it at the opening of
the slot. (See Figure 16.)
Caution To prevent jamming the carrier between the upper and lower edges of the port adapter slot,
and to assure that the edge connector at the rear of the port adapter mates with the connector at the
rear of the port adapter slot, make certain that the leading edges of the carrier are between the upper
and lower slot edges, as shown in the cutaway in Figure 16.
Figure 16 Positioning a Port Adapter for Installation
H3150
Upper edge
Lower edge
Carrier

20 PA-F/FD-SM and PA-F/FD-MM Full-Duplex FDDI Port Adapter Installation and Configuration
VIP2 and Full-Duplex FDDI Port Adapters
Step 10 Before you begin to insert the new port adapter in its slot, verify that the port adapter carrier
is between the upper and lower slot edges, as shown in Figure 17. Do not jam the carrier
between the slot edges.
Caution To ensure a positive ground attachment between the port adapter carrier and the VIP2
motherboard and port adapter slot, and to ensure that the connectors at the rear of the port adapter
and slot mate properly, the carrier must be between the upper and lower slot edges, as shown in
Figure 17.
Step 11 Carefully slide the new port adapter into the port adapter slot until the connector on the port
adapter is completely mated with the connector on the motherboard.
Figure 17 Aligning the Carrier Edge with Upper and Lower Slot Edges, Partial View
Step 12 Install the screw in the rear of the port adapter slot. (See Figure 14 for its location.) Do not
overtighten this screw.
Step 13 To replace the VIP2 in the chassis, follow the steps in the section “Installing a VIP2,” in the
configuration note Second-Generation Versatile Interface Processor (VIP2) Installation
and Configuration (Document Number 78-2658-xx), which shipped with your VIP2.
Step 14 If disconnected, reconnect the interface cables to the interface processor.
This completes the procedure for installing a new port adapter or replacing a port adapter on a VIP2.
H3152