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This chapter provides an overview of the ATM, 4E, FE and FDDI port adapter functionality, cabling and connectors as well as procedures for making port adapter connections. It contains the following sections:
The ATM Deluxe port adapter provides a single ATM interface to the MGX 8850 cellbus interface (CBI). The ATM port adapter is a permanent, internal ATM interface. As such, it has no cabling to install and no interface types supported. It connects internally, directly to the MGX 8850 midplane.
The CBI is derived from several modules. There are two distinct blocks; one is the ATM SAR function and the other is the cellbus controller ASIC. The ATM SAR function is based on the ATM Deluxe Dual SAR design and is implemented with two LSI ATMizerIIs. For the RPM-B, the design is implemented with two ATMizerII+. The cellbus controller is based on Cisco's WAN cellbus ASIC.
The following features from the ATM Deluxe port adapter are supported on the MGX 8850 switch:
The 4E port adapter (PA-4E) provides up to four IEEE 802.3 Ethernet 10BASE-T interfaces (see Figure 4-1).
The term Ethernet is commonly used for all carrier sense multiple access/collision detection (CSMA/CD) local-area networks (LANs) that generally conform to Ethernet specifications, including IEEE 802.3. Ethernet Version 2 and IEEE 802.3 were based on, and developed shortly after, Ethernet Version 1. The slight differences between Ethernet and IEEE 802.3 are implemented in hardware, and both are supported automatically by the Ethernet 10BASE-T port adapter without any hardware configuration changes. Together, Ethernet and IEEE 802.3 are the most widely used LAN protocols. They are well suited to applications where a local communication medium must carry sporadic, occasionally heavy traffic at high peak data rates.
Stations on a CSMA/CD LAN can access the network at any time. Before sending data, the station listens to the network to see if it is already in use. If it is, the station waits until the network is not in use, then transmits. A collision occurs when two stations listen for network traffic, hear none, and transmit simultaneously. When this happens, both transmissions are damaged, and the stations must retransmit. The stations detect the collision and use backoff algorithms to determine when they should retransmit.
Both Ethernet and IEEE 802.3 are broadcast networks, which means that all stations see all transmissions. Each station must examine received frames to determine whether it is the intended destination and, if it is, pass the frame to a higher protocol layer for processing. IEEE 802.3 specifies several different physical layers, and Ethernet defines only one.
Each IEEE 802.3 physical layer protocol has a name that summarizes its characteristics in the format speed/signaling method/segment length, where speed is the LAN speed in Mbps, signaling method is the signaling method used (either Baseband or Broadband), and segment length is the maximum length between stations in hundreds of meters.
Table 4-1 summarizes the characteristics of IEEE 802.3 Ethernet and Ethernet Version 2 for 10BASE-T.
| Parameter | IEEE 802.3 Ethernet | 10BASE-T Ethernet |
|---|---|---|
Data Rate (Mbps) | 10 | 10 |
Signaling method | Baseband | Baseband |
Max. segment length (m) | 500 | 100 (UTP) |
Media | 50-ohm coax (thick) | Unshielded twisted-pair (UTP) |
Topology | Bus | Star |
Table 4-2 lists the cabling specifications for 10-Mbps transmission over UTP and STP cables.
| Parameter | RJ-45 |
|---|---|
Cable specification | |
Maximum segment length | 328 ft (100 m) for 10BASE-T |
Maximum network length | 9,186 ft (2,800 m) (with 4 repeaters) |
| 1Cisco Systems does not supply Category 3 and Category 5 UTP RJ-45 cables; these cables are available commercially. 2AWG = American Wire Gauge. This gauge is specified by the EIA/TIA-568 standard. |
The 4E port adapter contains the enabled LED, standard on all port adapters, and one status LED for each port, called the link LED. After system initialization, the enabled LED goes on to indicate that the 4E port adapter has been enabled for operation. When a 10BASE-T port is active, its link LED is on when a port on the 4E port adapter is receiving a carrier signal from the network. (The LEDs are shown in Figure 4-1.) The following conditions must be met before the enabled LED goes on:
If any of these conditions is not met, or if the initialization fails for other reasons, the enabled LED does not go on.
The interface connectors on the 4E port adapter are four individual RJ-45 receptacles. You can use all four simultaneously. Each connection supports IEEE 802.3 and Ethernet 10BASE-T interfaces compliant with appropriate standards. The RJ-45 connections require external transceivers. Cisco Systems does not supply Category 5 UTP RJ-45 cables; these cables are available commercially.
Figure 4-2 shows the RJ-45 connectors. Refer to Appendix B, "Cable and Connector Specifications," for pinouts and signals for the RJ-45 connectors.
 | Warning The ports labeled "Ethernet," "10BASE-T," "Console," and "AUX" are safety extra-low voltage (SELV) circuits. SELV circuits should only be connected to other SELV circuits. Because the BRI circuits are treated like telephone-network voltage, avoid connecting the SELV circuit to the telephone network voltage (TNV) circuits. |
On a single 4E port adapter, you can use up to four RJ-45 connections.
Connect RJ-45 cables to the 4E port adapter as follows:
Step 1 Attach the Category 5 UTP cable directly to the RJ-45 port on the 4E port adapter.
The 4E port adapter is an end station device and not a repeater. You must connect the 4E port adapter to a repeater or hub.
Step 2 Attach the network end of your RJ-45 cable to your 10BASE-T hub or repeater, DTE, or other external 10BASE-T equipment.
Step 3 Repeat Steps 1 and 2 for each of the remaining 10BASE-T interfaces you want to install.
This completes the 4E port adapter cable installation.
The term Ethernet is commonly used for all carrier sense multiple access/collision detection (CSMA/CD), local-area networks (LANs) that generally conform to Ethernet specifications, including Fast Ethernet under IEEE 802.3u.
IEEE 802.3u is well suited to applications where a local communication medium must carry sporadic, occasionally heavy traffic at high peak data rates. Stations on a CSMA/CD LAN can access the network at any time. Before sending data, the station listens to the network to see if it is already in use. If it is, the station waits until the network is not in use, then transmits; this is a half-duplex operation. A collision occurs when two stations listen for network traffic, hear none, and transmit very close to simultaneously. When this happens, both transmissions are damaged, and the stations must retransmit. The stations detect the collision and use backoff algorithms to determine when they should retransmit.
Both Ethernet and IEEE 802.3u are broadcast networks, which means that all stations see all transmissions. Each station must examine received frames to determine whether it is the intended destination and, if it is, pass the frame to a higher protocol layer for processing.
IEEE 802.3u specifies the following different physical layers for 100BASE-T:
Each physical layer protocol has a name that summarizes its characteristics in the format speed/signaling method/segment length, where speed is the LAN speed in megabits per second (Mbps), signaling method is the signaling method used (either baseband or broadband), and segment length is typically the maximum length between stations in hundreds of meters. Therefore, 100BASE-T specifies a 100-Mbps, baseband LAN with maximum network segments.
Table 4-2 lists the cabling specifications for 100-Mbps Fast Ethernet transmission over UTP, STP, and fiber-optic cables. Table 4-2 summarizes IEEE 802.3u 100BASE-T physical characteristics.
| Parameter | RJ-45 | MII | SC-Type |
|---|---|---|---|
Cable specification | Category 3, 4, or 5, 150-ohm UTP or STP, or multimode optical fiber | 62.5/125 multimode optical fiber | |
Maximum cable length | - | 1.64 ft (0.5 m) (MII-to-MII cable3) | - |
Maximum segment length | 328 ft (100 m) for 100BASE-TX | 3.28 ft (1 m)4 or 1,312 ft (400 m) for 100BASE-FX | 328 ft (100 m) |
Maximum network length | 656 ft (200 m)4 (with 1 repeater) | - | 656 ft (200 m)4 (with 1 repeater) |
| 1EIA/TIA-568 or EIA-TIA-568 TSB-36 compliant. 2Cisco Systems does not supply Category 5 UTP RJ-45 or 150-ohm STP MII cables. Both are available commercially. 3This is the cable between the MII port on the FE port adapter and the appropriate transceiver. 4This length is specifically between any two stations on a repeated segment. |
| Parameter | 100BASE-FX | 100BASE-TX |
|---|---|---|
Data rate (Mbps) | 100 | 100 |
Signaling method | Baseband | Baseband |
Maximum segment length (meters) | 100 m between repeaters | 100 m between DTE1 and repeaters |
SC-type: dual simplex or single duplex for Rx and Tx | RJ-45MII | |
Topology | Star/Hub | Star/Hub |
| 1DTE = data terminal equipment. |
Figure 4-5 shows the FE port adapter.
Each Fast Ethernet port on the FE-TX port adapter has an RJ-45 connector to attach to Category 5 unshielded twisted-pair (UTP) for 100BASE-TX, and a MII connector that permits connection through external transceivers to multimode fiber for 100BASE-FX, or to Category 3, 4, and 5 UTP or shielded twisted-pair (STP) for 100BASE-T4 physical media.
Each Fast Ethernet port on the FE-FX port adapter has an SC-type fiber-optic connector for 100BASE-FX, and an MII connector that permits connection through external transceivers to multimode fiber for 100BASE-FX, or to Category 3, 4, and 5 UTP or shielded twisted-pair (STP) for 100BASE-T4 physical media.
The FE-TX and FE-FX port adapters contain the enabled LED, standard on all port adapters, and a bank of three status LEDs for the ports. After system initialization, the enabled LED goes on to indicate that the FE-TX port adapter has been enabled for operation. The LEDs are shown in Figure 4-5.
The following conditions must be met before the enabled LED goes on:
If any of these conditions is not met, or if the initialization fails for other reasons, the enabled LED does not go on.
Following are the three status LEDs and an explanation of what each indicates:
The two interface receptacles on the FE port adapter are a single MII, 40-pin, D-shell type, and a single RJ-45 (or SC-type for FE-FX optical-fiber connections). You can use either one or the other. Only one receptacle can be used at one time. Each connection supports IEEE 802.3u interfaces compliant with the 100BASE-X and 100BASE-T standards. The RJ-45 connection does not require an external transceiver. The MII connection requires an external physical sublayer (PHY) and an external transceiver.
Cisco Systems does not supply Category 5 UTP RJ-45 cables; these cables are available commercially. Refer to Appendix B, "Cable and Connector Specifications," for pinouts and signals for the FE-TX RJ-45 connectors.
Figure 4-6 shows the RJ-45 connector used for FE-TX connections.
| Warning The ports labeled "Ethernet," "10Base-T," "Console," and "AUX" are safety extra-low voltage (SELV) circuits. SELV circuits should only be connected to other SELV circuits. Because the BRI circuits are treated like telephone-network voltage, avoid connecting the SELV circuit to the telephone network voltage (TNV) circuits. |
Figure 4-7 shows the duplex SC connector (one required for both transmit and receive), and Figure 4-8 shows the simplex SC connector (two required, one for each transmit and receive) used for FE-FX optical-fiber connections. These multimode optical-fiber cables are commercially available, and are not available from Cisco Systems.
Depending on the type of media you use between the MII connection on the port adapter and your switch or hub, the network side of your 100BASE-T transceiver should be appropriately equipped with ST-type connectors (for optical fiber), BNC connectors, and so forth. Figure 4-9 shows the pin orientation of the female MII connector on the port adapter. The port adapters are field-replaceable units (FRUs).
The MII receptacle uses 2-56 screw-type locks, called jackscrews (see Figure 4-9), to secure the cable or transceiver to the MII port. MII cables and transceivers have knurled thumbscrews that you fasten to the jackscrews on the FE-TX port adapter's MII connector. Use the jackscrews to provide strain relief for your MII cable. Figure 4-9 shows the MII female connector (receptacle).
 | Caution Before you attach your MII transceiver to the MII receptacle on your FE port adapter, ensure that your MII transceiver responds to physical sublayer (PHY) address 0 per section 22.2.4.4. "PHY Address" of the IEEE 802.3u specification; otherwise, interface problems might result. Confirm that this capability is available on your MII transceiver with the transceiver's vendor or in the transceiver's documentation. If a selection for Isolation Mode is available, we recommend you use this setting (if no mention is made of PHY addressing). |
Refer to Appendix B, "Cable and Connector Specifications," for the MII connector pinout and signals. MII cables are available commercially and are not available from Cisco Systems. Table B-6 refers to MII cables used between the MII connector on the FE-TX port adapter and an appropriate transceiver. The connection between this transceiver and your network can be Category 3, 4, or 5, 150-ohm UTP or STP, or multimode optical fiber.
| Caution Before you attach your MII transceiver to the MII receptacle on your FE port adapter, ensure that your MII transceiver responds to physical sublayer (PHY) address 0 per section 22.2.4.4. "PHY Address" of the IEEE 802.3u specification; otherwise, interface problems might result. Confirm that this capability is available on your MII transceiver with the transceiver's vendor or in the transceiver's documentation. If a selection for Isolation Mode is available, we recommend you use this setting (if no mention is made of PHY addressing). |
Use the following procedure to connect RJ-45, SC (FE-FX), or MII cables:
Step 1 If you have MII connections, attach an MII cable directly to the MII receptacle on the FE port adapter or attach a 100BASE-T transceiver, with the media appropriate to your application, to the MII receptacle on the FE port adapter.
If you have RJ-45 connections, attach the Category 5 UTP cable directly to the RJ-45 port on the FE port adapter. The FE port adapter is an end station device and not a repeater. You must connect the FE port adapter to a repeater or hub.
If you have an SC connection (FE-FX port adapter), attach the cable directly to the SC port on the FE-FX port adapter. Use either one duplex SC connector or two simplex SC connectors, and observe the correct relationship between the receive (RX) and transmit (TX) ports on the FE-FX port adapter and your repeater.
| 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. |
Step 2 For the FE-TX, attach the ferrite bead to the RJ-45 cable (at either end), as shown in Figure 4-10.
| Caution The ferrite bead prevents electromagnetic interference (EMI) from affecting the FE-TX-equipped system and is a required component for proper system operation. |
Attach the network end of your RJ-45 (SC) or MII cable to your 100BASE-T transceiver, switch, hub, repeater, DTE, or other external 100BASE-T equipment.
This completes the FE port adapter cable installation.
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.
A ring 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 4-11 shows a typical FDDI configuration with both dual-attached and single-attached connections. Single attachment stations (SASs) 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.
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 4-12, 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 4-12, 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.
For example, if Station 1 in Figure 4-12 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.
This section includes information on optical bypass switching and its use with FDDI.
Optical bypass switching avoids segmentation by eliminating failed stations from a ring. An optical bypass switch allows the light signal to pass directly through it, completely bypassing the failed or shut down station.
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 4-13 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 4-13.
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.
Typically, FDDI uses two types of fiber-optic cable:
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 2 kilometers (1.2 miles) for multimode fiber and 15 kilometers (9.3 miles) 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 2 kilometers.
Refer to Appendix B, "Cable and Connector Specifications," for a description of 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).
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.
The maximum transmission distances for single-mode and multimode FDDI stations are shown in Table 4-5. If the distance between two connected stations is greater than the maximum distance shown, significant signal loss can result.
| 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) |
The multimode and single-mode optical-fiber connections conform to the following optical power parameters:
This section describes the half-duplex FDDI port adapters.
The FDDI port adapters provide a half-duplex FDDI 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:
| 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. |
This section describes the functions of the LEDs on the half-duplex FDDI port adapters.
The FDDI port adapter contains the enabled LED, standard on all port adapters, and status LEDs for each port. After system initialization, the enabled LED goes on to indicate that the FDDI port adapter has been enabled for operation. The LEDs are shown in Figure 4-16 and Figure 4-17. The LEDs on both half-duplex FDDI port adapters are identical and are described in Table 4-6.
The following conditions must be met before the enabled LED goes on:
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:
The states of the port adapter's LEDs and the meanings of each are described in Table 4-6.
| PA-F-MM and PA-F-SM LEDs1 | Indication | ||
|---|---|---|---|
| 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 |
| 1For the LED patterns "---" means off, "O" means on. |
This section describes the half-duplex FDDI port adapter receptacles and cables.
The interface receptacles on the FDDI port adapter use SC-type connectors for simplex and duplex, single-mode applications. For FDDI single-mode connections, use one duplex SC connector (see Figure 4-14) or two single SC connectors, at both the port adapter end and the network end (see Figure 4-15). Single-mode optical fiber cable has a narrow core (8.7 to 10/125-micron) that allows light to enter only at a single angle.
| 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. |
Figure 4-16 shows a view of the SMF FDDI port adapter.
Figure 4-17 shows a view of the MMF FDDI port adapter.
This section describes the functions of the LEDs on the half-duplex FDDI port adapters.
The FDDI port adapter contains the enabled LED, standard on all port adapters, and status LEDs for each port. After system initialization, the enabled LED goes on to indicate that the FDDI port adapter has been enabled for operation. The LEDs are shown in Figure 4-16 and Figure 4-17. The LEDs on both half-duplex FDDI port adapters are identical and are described in Table 4-7.
The following conditions must be met before the enabled LED goes on:
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:
The states of the port adapter's LEDs and the meanings of each are described in Table 4-7.
| PA-F-MM and PA-F-SM LEDs1 | Indication | ||
|---|---|---|---|
| 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 |
| 1For the LED patterns "---" means off, "O" means on. |
This section describes the half-duplex FDDI port adapter receptacles and cables.
The interface receptacles on the FDDI port adapter are MICs for multimode 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. Fiber-optic cables are commercially available and are not available from Cisco Systems. Multimode uses the integrated MIC shown in Figure 4-18, at both the port adapter end and the network end.
Both single-mode and multimode, dual attachment cable connections are available. Fiber-optic cable connects directly to the FDDI ports. Single-mode uses simplex or duplex SC-type transmit and receive cables. Connect single-mode, dual attachment as shown in Figure 4-19.
Multimode uses MIC cables. Connect multimode with Fixed Shrouded Duplex connector as shown in Figure 4-20.
An optical bypass switch is a device installed between the ring and the station that provides additional fault tolerance to the network. If an FDDI port adapter that is connected to a bypass switch fails or shuts down, the bypass switch activates automatically and allows the light signal to pass directly through it, bypassing the port adapter completely.
Following are general instructions for connecting an optical bypass switch to the FDDI port adapter; however, your particular bypass switch may require a different connection scheme. Use these steps and the illustrations in Figure 4-21 and Figure 4-22 as general guidelines, but for specific connection requirements, refer to the instructions provided by the manufacturer of the optical bypass switch.
A port for connecting an optical bypass switch is provided on the multimode port adapter (PA-F/FD-MM, shown in Figure 4-21), and the single-mode port adapter (PA-F/FD-SM, shown in Figure 4-22).
Posted: Tue Oct 19 10:34:25 PDT 1999
Copyright 1989-1999©Cisco Systems Inc.
