Bay Networks BayStack 893-862-B Mode d’emploi
March 1996
*893-862-B*
Bay Networks, Inc. Corporate Headquarters
4401 Great America Parkway
Santa Clara, CA 95054 8 Federal Street
Billerica, MA 01821
Using the BayStack
Ethernet Fiber Media
Adapters
893-862-B SMF MDA Page -1 Monday, September 30, 1996 1:32 PM
© 1996 by Bay Networks, Inc. All rights reserved.
Trademarks
Bay Networks, BayStack, and Bay Networks Press are trademarks of Bay
Networks, Inc. Other brand and product names are registered trademarks or
trademarks of their respective holders.
Statement of Conditions
In the interest of improving internal design, operational function, and/or reliability,
Bay Networks, Inc. reserves the right to make changes to the products described in
this document without notice. Bay Networks, Inc. does not assume any liability that
may occur due to the use or application of the product(s) or circuit layout(s)
described herein.
Related Publications
For more information about the installation and use of BayStack
™
hubs and optional
equipment, refer to the following publications:
•
Using the BayStack 10BASE-T Hubs
(Bay Networks
™
part number
893-839-B)
•
Using the BayStack Ethernet Network Management Modules
(Bay Networks part number 893-841-A)
Ordering Bay Networks Publications
To purchase additional copies of this document or other Bay Networks publications,
order by part number from Bay Networks Press
™
at the following numbers.You may
also request a free catalog of Bay Networks Press product publications.
• Phone: 1-800-845-9523
• FAX: U.S./Canada: 1-800-582-8000, International: 1-916-939-1010
893-862-B SMF MDA Page 0 Monday, September 30, 1996 1:32 PM
893-862-B 1
Introduction
This guide describes the Bay Networks 10BASE-FL (fiber link)
and single-mode fiber media adapters for the BayStack
10BASE-T Hubs, and provides instructions for installing,
connecting, and configuring the adapters in the hub.
Each BayStack fiber media adapter provides one nonredundant
single- or multimode fiber port for flexible backbone
connectivity to your BayStack 10BASE-T Hub. Both adapters
employ 10BASE-FL signaling technology.
The BayStack 10BASE-T Hub provides two Media Adapter
LEDs to indicate the status of the hub media adapter ports A and
B. For more information about interpreting media adapter LEDs,
refer to Chapter 1, “Quick Reference Information,” in
Using the
BayStack 10BASE-T Hubs
.
This guide contains the following sections:
• BayStack 10BASE-FL Media Adapter
• BayStack Single Mode Fiber Media Adapter
• Fiber Optic Cable Length Limitations
• Installing a Media Adapter in a BayStack Hub
For more information about how the media adapter operates in
the hub, refer to
Using the BayStack 10BASE-T Hubs
(Bay
Networks Part number 893-839-B).
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2 893-862-B
BayStack 10BASE-FL Media Adapter
The BayStack 10BASE-FL Media Adapter is a modular
10BASE-FL fiber link port. It is designed to be installed in either
media adapter slot of a BayStack 10BASE-T Hub.
The port is compatible with the IEEE 802.3 10BASE-FL
specification for Ethernet running over 62.5/125
µ
m or 50/125
µ
m multimode fiber optic cable.
Connection is made to the port using two straight-tip (ST)
connectors (Tx and Rx).
For more information about multimode fiber optic cable
connection and limitations, see “Fiber Optic Cable Length
Limitations” later in this guide.
5956
TX
10BASE-FL
RX
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893-862-B 3
BayStack Single Mode Fiber Media Adapter
The BayStack Single Mode Fiber Media Adapter is a modular
port supporting 10BASE-F signaling. It is designed to be
installed in the media adapter slot of any BayStack 10BASE-T
Hub.
The port conforms to Bay Networks proprietary standards for
Ethernet running over 9/125
µ
m single-mode fiber optic cable.
No IEEE or other international standards exist for this
configuration at this time.
Connection is made to the port using two straight-tip (ST)
connectors (Tx and Rx).
For more information about single-mode fiber optic cable
connection and limitations, see “Fiber Optic Cable Length
Limitations” next in this guide.
6770
TX
Single Mode Fiber
RX
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4 893-862-B
Fiber Optic Cable Length Limitations
The 10BASE-F standard permits you to use fiber optic cables up
to 2000 meters long. However, the fiber connection must meet:
• Optical power budget
• Ethernet repeater rules
For more information about simple rules for Ethernet network
compliance, refer to
Using the BayStack 10BASE-T Hubs
.
BayStack 10BASE-FL Media Adapter
The optical power budget for the 10BASE-FL media adapter is
shown in Table 1. Power loss in the link cannot exceed the value
for the type of fiber optic cable you are using.
Only in-line fiber-to-fiber connections (a connection between
two fibers terminated with fiber connectors, using a fiber-to-fiber
connector) count against the optical power budget. The loss in a
fiber connection at the ends of the link is included in the optical
power budget and does not count as an in-line connection.
Table 1. 10BASE-FL Optical power budget
Parameter 62.5/125
µ
m 50/125
µ
m
Transmitted power (average) –20.0 dBm –25.7 dBm
Receiver sensitivity (average) –32.5 dBm –32.5 dBm
Optical power budget 12.5 dB 6.8 dB
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893-862-B 5
Table 2 lists the most common cable and connector combinations
for the 10BASE-FL media adapter, assuming the maximum
permitted attenuation with ST connectors. The table lists the
maximum (total) distance allowed in the fiber connection.
However, your fiber connection may have to be shorter to meet
the optical power budget and Ethernet repeater rules.
Table 2. 10BASE-FL cable and connector combinations
Number of in-line
fiber-to-fiber
connections
62.5/125-
µ
m
cable 50/125-
µ
m
cable
02000 m (6560 ft) 2000 m (6560 ft)
1 2000 m (6560 ft) 2000 m (6560 ft)
2 2000 m (6560 ft) 2000 m (6560 ft)
3 2000 m (6560 ft) 1710 m (5620 ft)
4 2000 m (6560 ft) 1430 m (4690 ft)
5 2000 m (6560 ft) 1140 m (3750 ft)
6 1750 m (5740 ft) 860 m (2810 ft)
7 1500 m (4920 ft) 570 m (1870 ft)
8 1250 m (4100 ft) 290 m (940 ft)
9 1000 m (3280 ft) 0
10 750 m (2460 ft)
11 500 m (1640 ft)
12 250 m (820 ft)
13 0
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6 893-862-B
BayStack Single Mode Fiber Media Adapter
The optical power budget for the single-mode fiber media
adapter is shown in Table 1. Power loss in the link cannot exceed
the value for the type of fiber optic cable you are using.
Only in-line fiber-to-fiber connections (a connection between
two fibers terminated with fiber connectors, using a fiber-to-fiber
connector) count against the optical power budget. The loss in a
fiber connection at the ends of the link is included in the optical
power budget and does not count as an in-line connection.
Table 3. Single-mode fiber optical power budget
Parameter 9/125
µ
m
Transmitted power (average) –29.0 dBm
Receiver sensitivity (average) –35.5 dBm
Optical power budget 6.5 dB
NOTE:
Your fiber connection must meet the optical
power budget and the Ethernet repeater rules for your
network.
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893-862-B 7
Installing a Media Adapter in a BayStack Hub
A BayStack 10BASE-FL media adapter is installed in a slot on
the front of the BayStack 10BASE-T Hub.
To install a media adapter, follow these steps:
1. Unplug the BayStack 10BASE-T Hub power cord from
the AC power source.
2. Remove the filler panel from the media adapter slot on
the front panel of the hub.
3. Install the media adapter into the media adapter slot.
a. Align the media adapter with the card guides and gently
slide in the media adapter until you feel it align with the
connector on the hub motherboard.
b. Firmly push the media adapter into the connector.
c. Tighten the captive retaining screw on the media adapter
by turning the screw clockwise.
4. Reconnect the power cord.
The hub powers up and performs a self-test.
5. Make appropriate cable connections.
For cabling information, see the section earlier in this guide
that refers to the media adapter you are installing.
CAUTION:
Do not force or overtighten the
captive retaining screw on the media adapter.
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8 893-862-B
6. Verify the installation for the media adapter.
Observe for the installed media adapter that the respective
Media Adapter LEDs on the front panel of the hub light
according to Table 4.
For more information about interpreting media adapter
LEDs, refer to Chapter 1, “Quick Reference Information,” in
Using the BayStack 10BASE-T Hubs
.
Table 4. Media adapter status LEDs
Hub media
adapter LEDs Media adapter status
Green Link status is good, port not partitioned.
Amber Link status is good, port is partitioned.
Off Link status is bad or connection is not
present.
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