Cisco Explorer 4700, Hardware Installation And Maintenance Manual

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Preparing for Installation 2-25
Network Connection Considerations
Fiber Distributed Data Interface Connections
Multimode FDDI network processor modules provide either a dual-attachment station (DAS) or a
single-attachment station (SAS). Single-mode FDDI network processor modules provide a DAS.
Following are the available FDDI module options:
•
Multimode dual-attachment
•
Multimode single-attachment
•
Single-mode dual-attachment
The multimode FDDI network processor module consists of two cards, each with a multimode
transceiver, with one card fitting on top of the other. The bottom card is the SAS and contains the
PHY-A port. If the DAS option is included, the PHY-B port is located on the module’s top card.
Distance Limitations for FDDI Connections
The distance limitations for single-mode and multimode FDDI stations are shown in Table 2-5. If
the distance between two connected stations is greater than the maximum distance shown,
significant signal loss can result. The single-mode transmitter and the multimode transceiver each
provide 11 dB of optical power.
Table 2-5 FDDI Maximum Transmission Distances
FDDI Cable Connections
The XMTR and RCVR ports of the single-mode network processor module (see Figure 2-24) use
simplex FC-type connectors (see Figure 2-25). The ports accept standard 8.7 to 10/125-micron
single-mode fiber-optic cable, supporting connections at distances up to 6 miles (10 kilometers).
Figure 2-24 Dual-Attachment Single-Mode FDDI Module—End View
Transceiver Type Maximum Distance Between Stations
Single-mode Up to 6 miles (10 kilometers)
Multimode Up to 1.2 miles (1.9 kilometers)
H1614a
PHY-B
PHY-A
Alignment groove
Mounting
screw locations
Alignment groove
XMTR RCVR
AVOID EXPOSURE–INVISIBLE
LASER RADIATION IS EMITTED
FROM THESE APERTURES.
PHY–B
RING OP
PHY–A
RING OP
FDDI WARNING
CISCO SYSTEMS, INC.
170 WEST TASMAN DRIVE
SAN JOSE, CA 95134-1706
DATE:
“Complies with FDA Radiation
Performance Standards, 21 CFR,
Subchapter J”
1300
NM
CLASS 1 LASER PRODUCT
LASERKLASSE 1