Bay Networks BayStack 893-862-B Leitfaden

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

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).

893-862-B SMF MDA Page 1 Monday, September 30, 1996 1:32 PM

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

m or 50/125

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

10BASE-FL

893-862-B SMF MDA Page 2 Monday, September 30, 1996 1:32 PM

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

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

Single Mode Fiber

893-862-B SMF MDA Page 3 Monday, September 30, 1996 1:32 PM

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

m 50/125

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

893-862-B SMF MDA Page 4 Monday, September 30, 1996 1:32 PM

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-

cable 50/125-

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

893-862-B SMF MDA Page 5 Monday, September 30, 1996 1:32 PM

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

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.

893-862-B SMF MDA Page 6 Monday, September 30, 1996 1:32 PM

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.

893-862-B SMF MDA Page 7 Monday, September 30, 1996 1:32 PM

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.

893-862-B SMF MDA Page 8 Monday, September 30, 1996 1:32 PM

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