Fiber Distributed Data Interface Connections - Cisco EF4116 Hardware Installation And Maintenance Manual

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:
•
•
•
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
Transceiver Type Maximum Distance Between Stations
Single-mode
Multimode
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
Alignment groove
Multimode dual-attachment
Multimode single-attachment
Single-mode dual-attachment
FDDI Maximum Transmission Distances
Up to 6 miles (10 kilometers)
Up to 1.2 miles (1.9 kilometers)
Dual-Attachment Single-Mode FDDI Module—End View
PHY-B
XMTR PHY-A RCVR
Mounting
screw locations
FDDI WARNING
AVOID EXPOSURE–INVISIBLE
PHY–B
LASER RADIATION IS EMITTED
RING OP
FROM THESE APERTURES.
1300
NM
CLASS 1 LASER PRODUCT
LASERKLASSE 1
CISCO SYSTEMS, INC.
170 WEST TASMAN DRIVE
SAN JOSE, CA 95134-1706
PHY–A
DATE:
RING OP
"Complies with FDA Radiation
Performance Standards, 21 CFR,
Subchapter J"
Alignment groove
Network Connection Considerations
Preparing for Installation 2-25