Digital Equipment DECrepeater 900TL User manual

EK–DTROR–IN. A01
DECrepeater 900TL
INSTALLATION
PK–02580–IL
DEChub ONE Repeater 900TL DECrepeater 900TL
The DECrepeater 900TL is a Token Ringrepeaterthatoperates ata speedof 4or
16Mb/s.Itextendstrunkandlobedistancesforunshieldedandshielded100-ohm
cable.AsamemberofDigital’sTokenRingproductfamily,itoperatesinaDEChub
900 MultiSwitch, or as a standalone unit (DEChub ONE Repeater 900TL). The
DECrepeater 900TL can also be managed by optional HUBwatch management
software.
LKG–8176-93I

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FCC NOTICE – Class A Computing Device:
This equipment generates, uses, and may emit radio frequency energy. The equipment has been
typetestedandfoundtocomplywiththelimitsforaClassAcomputingdevicepursuanttoSubpart
Jof Part 15 of FCC Rules, which are designed to provide reasonable protection against such radio
frequency interference when operated in a commercial environment. Operation of this equipment
in a residential area may cause interference; in which case, measures taken to correct the
interference are at the user’s expense.
The following are trademarks of Digital Equipment Corporation:
       
    
EK–DTROR–IN. A01
August 1993
The information in this document is subject to change without notice and should not be
construed as a commitment by Digital Equipment Corporation. Digital Equipment Corpo-
ration assumes no responsibility for any errors that may appear in this document.
Copyright 1993 by Digital Equipment Corporation
All Rights Reserved.
Printed in U.S.A.
VCCI NOTICE – Class 1 Computing Device:
This equipment is in the 1st Class category (information equipment to be used in commercial
and/or industrial areas) and conforms to the standards set by the Voluntary Control Council for
Interference by Data Processing Equipment and Electronic Office Machines aimed at preventing
radio interference in commercial and/or industrial areas.
Consequently,whenusedinaresidentialareaorinanadjacentareathereto,radiointerferencemay
be caused to radios and TV receivers, etc.
Read the instructions for correct handling.
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Copyright
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2 DECrepeater 900TL

1) Power LED. Lights when the repeater has power.
2) Module OK LED. Lights when the repeater passes
self-test.Iftherepeaterfailsself-test,theModuleOK
LED is off.
3) Ring A/B LEDs. In a DEChub 900 MultiSwitch,
when either the A LED or the B LED is on, the
respective A or B ring is active. In a standalone
repeater, both Ring LEDs are always off.
4) Speed LEDs. Either the 16 LED or the 4 LED is on
to show the ring speed.
5) Ring In LED. Lights when a Ring In connection is
active.
6) Ring Out LED. Lights when a Ring Out connection
is active.
7) Speed Switch. Sets speed. Set to 16 when the
network speed is 16 Mb/s. Set to 4 when the
network speed is 4 Mb/s. Network management
cannot override Speed switch settings.
8) Ring In Port. Connects Ring In to the Ring Out port
of a repeater or Multistation Access Unit (MAU).
9) Autowrap Switches. Determine whether or not the
repeater automatically loops back when it detects a
disconnected link on Ring In or Ring Out. If the Ring
InorRing Out port connects to adevicewithDigital’s
Autowrap, set the switch to 1 to enable Autowrap. If
the Ring In or Ring Out port connects to a device
without Digital’s Autowrap, set the switch to 0 to
disable Autowrap.
10) RingOutPort.ConnectsRingOuttotheRingInport
of a repeater or Multistation Access Unit (MAU).
11) Reset Switch. Resets all settings, except for the
Speed switch setting, to their factory defaults. To
reset: while turning on the power, press the reset
switch with a pen or screwdriver.
Front Panel
DECrepeater 900TL 3
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1
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4
5
6
7
8
9
10
11
9

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PK–02586–IL
Note:
The rear panel shown here is used only when the
repeater is in a standalone configuration.
12) Power Connector. Provides power connection for
the repeater. (DEChub ONE only)
Rear Panel of DEChub ONE Repeater 900TL
4DECrepeater 900TL
PK–02586–IL
LKG-8255-93I
12

                    
Remove the rear cover (if necessary).
If you want to install a DEChub ONE Repeater 900TL in a hub,
you need to remove the rear cover.
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Installing a Repeater in a DEChub 900 MultiSwitch
DECrepeater 900TL 5
Set Speed switch.
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Set the Speed switch to 16 when the
network speed is 16 Mb/s or 4 when
the speed is 4 Mb/s.
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LKG–8151-93I
a. Lift up the latch on the rear cover
by inserting a small flat-blade screw
driver into the top mounting hole.
b. With the latch up, pull the top of the
rearcoveraway,pivoting around the
bottom of the repeater.

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Connect hubs or station.
To connect two hubs . . .
a. SettheRing InandtheRing Out Autowrap
switches to 1 to enable Autowrap.
b. Connect the repeater’s Ring Out port to
the Ring In port of the repeater in the
adjacent hub. Also connect the repeater’s
Ring In port to the Ring Out port of the
repeater in the adjacent hub.
c. Once the ring becomes active, verify that
the Ring In and Ring Out LEDs are on.
To use as a lobe extender . . .
a. Set the Ring In and the Ring Out
Autowrap switches to 1 to enable
Autowrap.
b. Connect the station to the Ring Out port.
c. Once the ring becomes active, verify
that the Ring Out LED is on.
Installing a Repeater in a DEChub 900 MultiSwitch (continued)
6DECrepeater 900TL
Install the repeater on the hub.
PK–02570–IL
a. Align the repeater’s 48-pin
connector with any available 48-pin
slot in the hub.
b. Place the repeater’s bottom
mounting tab into the mounting slot
on the hub.
c. Pivot the repeater into place. You
hear a click when the repeater is
seated.
d.Press down on the release lever to
ensure that it is locked.
e. With power on in the hub, verify that
the Power, Module OK, and Speed
LEDs are on. If there is traffic on the
network, the Ring A or B LED will
also be on.
PK–02570–IL
The release lever is
lifted and clicks
back into place
as the module
is seated.
LKG–8258-93I
Mounting
tab
LKG–8152-93I
Note:
Before installing the module in a hub, verify that the
module’s input power rating does not exceed the
available power that the Hub Manager LCD displays.

Mount repeater (optional).
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a. Connect the power supply cable to
the power connector.
b.Plug the power supply into a wall
outlet.
c. Withpower on, verify that the Power
and Module OK LEDs are on.
Set Speed switch.
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Youcan placethe repeateron a table,mount iton awall,or installitin astandard19-inch rack
using a shelf assembly, Digital part number H9544-MS.
Forawallmounting,positiontwoscrews19.7centimeters(7.75inches)apartonthewall.Turn
the screws until tight, and then back off two turns. Hang the repeater using the keyholes.
Installing a DEChub ONE Repeater 900TL
PK–02584–IL
DECrepeater 900TL 7
Connect power supply.
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Set the Speed switch to 16 when the
network speed is 16 Mb/s or 4 when the
speed is 4 Mb/s.
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LKG–8153-93I
To
Power
Supply
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To connect an adjacent MAU or
repeater . . .
a. Set the Ring In and the Ring Out
Autowrap switches to 1 or 0. Refer
to page 3 for information on the
Autowrap switch settings.
b. Connect the repeater’s Ring Out
port to the Ring In port of the
adjacent MAU or repeater.
c. Connect the repeater’s Ring In port
to the Ring Out port of the adjacent
MAU or repeater.
d. Oncetheringbecomesactive,verify
that the Ring In and Ring Out LEDs
are on.
Connect a MAU, repeater, or station.
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Installing a DEChub ONE Repeater 900TL (continued)
8DECrepeater 900TL
To use as a lobe extender . . .
a. Set the Ring In and the Ring Out
Autowrap switches to 1 to enable
Autowrap.
b. Connect the station to the Ring Out
port.
c. Connect the Ring In port to a station
port on a MAU.
d. Once the station becomes active,
verify that the Ring Out LED is on.
LKG-8154-93I

Removing a Repeater from a DEChub 900 MultiSwitch
a. Lift up the release lever on the
hub.
b. Pivot the repeater back on its
bottom mounting tab until it
disengages from the hub.
DECrepeater 900TL 9
Note:
When you remove a repeater from the
DEChub 900 MultiSwitch, do not turn off the
hub power.
Remove the repeater from the hub.
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Disconnect the station and trunk connector cables
from the repeater.
Lift the release lever.
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Mounting
tab

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LED Summary
LED1Off On Flashing
Power No power Power OK N/A
Module OK Self-test failed Self-test OK N/A
or not operating
Speed No power, or Valid speed N/A
(4/16 Mb/s) repeater needs
an upgrade.
(see Ring A/B
LEDs)
Ring In/ Inactive or Connected to network Continuous single flash: network
Ring Out wire fault management disabled port.
Continuous double flash: wrong speed.
Hub MAU ONLY:
Ring A/B Not connected Connected to Ring A Continuous single flash: network
or Ring B management disabled port.
A and B alternately flash: repeater needs
an upgrade or an upgrade is in progress.
1Scroll: Duringpower-up self-tests, all LEDs, except for the Power LED, will indicate a scrolling
pattern.
Ring Speed Notes:
Evenifyousettherepeater’sSpeedswitchtothewrongspeed,nodatawillbelostorcorrupted.Traffic
loops back at the point where there is a speed mismatch, and the rest of the network remains
operational.
The repeater’s speed detection feature protects the network from devices that are set at the wrong net-
workspeed. When using somenon–Digitalequipment,isolating faultsandreconfiguringthe network
may take up to 20 seconds.
The LEDs indicate status by being on, off, and flashing. Flashing LEDs indicate special situations.
Therearetwoflashingpatternsandascrollpattern. WhenanLEDindicatesacontinuoussingle-flash
pattern, network management has disabled the port. A continuous double-flash patternindicates the
wrong speed. In a scroll pattern, the LEDs turn on and off in a set order.
10 DECrepeater 900TL

Repeater Cabling
Table 1lists themaximum distancebetween twoadjacent repeaters, andbetween arepeater and
astation. You can use UTP level 3 cable to extend lobe length, but do not use it as a trunk cable.
Table 1 Maximum Cable Length between Active Units1
1All distances include patch cables and hub connections.
Table 2 shows the industry guideline for cable length between a repeater and a passive MAU.
Although cable lengths in excess of these distances are physically possible with a DECrepeater
900TL,Digitalrecommendsthatyoukeepcablelengthswithinthemaximumsfoundintheindustry
guideline to allow for future network expansion and upgrade.
Table 2 Industry Cable Length Guideline between a Repeater and a Passive MAU1
1All distances include patch cables and hub connections.
DEChub 900 MultiSwitch Configuration
Multiple Hubs
Arepeater is needed in each DEChub 900 MultiSwitch to connect hubs in a multiple hub network.
UTP
Speed Level 3 Level 5
4 Mb/s 100 m (327 ft) 100 m (327 ft)
16 Mb/s 65 m (213 ft) 100 m (327 ft)
UTP
Speed Level 3 Level 5
4 Mb/s 300 m (983 ft) 400 m (1311 ft)
16 Mb/s 130 m (426 ft) 200 m (655 ft)
DECrepeater 900TL 11

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Repeater Cabling (continued)
DEChub ONE Configuration
UTP Cable:
Multiple Wiring Closets
Digital recommends that you use repeaters to segment the ring in a network with multiple wiring
closets.
Whendistancesexceedthe lobe lengthsin Table2, orif theMAU doesnot haveDigital’sAutowrap
functionality, two repeaters are required.
Whena MAU has Autowrap enabled, only one repeater is required per wiring closet if the distance
between the wiring closets does not exceed the distances shown in Table 2.
12 DECrepeater 900TL

Problem Solving
If ... Then ... Do This ...
DEChub 900 MultiSwitch and DEChub ONE
Power LED is off. Repeater does not have Verify that outlet has power.
power. Check power connection to
repeater.
Replace power supply.
Replace repeater.
Module OK LED is off. Repeater failed self-test. Replace repeater.
Ring A and B LEDs alternately Repeater needs an upgrade If you have network management,
flash. or an upgrade is in progress. do a downline load;
otherwise, replace repeater.
Wait for upgrade to complete.
Ring In or Ring Out LED has Network management To change settings, you can use
single flash pattern. disconnected the repeater’s network management commands
RI or RO port. or the repeater’s Reset switch.
Ring In or Ring Out LED has Repeater and ring have Change the speed setting of the
double flash pattern. different speed settings. repeater, stations or the ring.
DECrepeater 900TL 13
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Problem Solving (continued)
If ... Then ... Do This ...
DEChub 900 MultiSwitch ONLY
Ring In, Ring Out and Ring Network management has To change settings, you can use
A/B LEDs flash together. disabled repeater. network management commands
or the repeater’s Reset switch.
Repeater does not connect to Network management will not Check speed and hub
the hub. connect repeater to hub. settings for incorrect network
management overrides.
Repeater does not work DEChub 90 only supports A DEChub 900 MultiSwitch
in a DEChub 90. Ethernet networks. supports Token Ring networks.
DEChub ONE ONLY
Ring In and Ring Out LEDs Network management has To change settings, you can use
flash together. disabled repeater. network management commands
or the repeater’s Reset switch.
Vendor’s MAU or repeater Vendor’s unit is incompatible Set Autowrap switches to 0 on the
causes loopback on ring. with Digital’s Autowrap. DECmauorDECrepeateradjacent
to the vendor’s unit.
Network crashes when a Vendor’s unit does not have Set Autowrap switches to 1 on the
MAU or repeater fails. Digital’s Autowrap. DECmauorDECrepeateradjacent
to the failed unit.
14 DECrepeater 900TL

Product Specifications
Product Specification In a Hub DEChub ONE
Height 27.3 cm (10.8 in) 27.3 cm (10.8 in)
Width 3.2 cm (1.2 in) 3.2 cm (1.2 in)
Depth 11.2 cm (4.4 in) 13.7 cm (5.4 in)
Weight 0.68kg (1.5 lb) 0.77kg (1.7 lb)
Operating temperature 5°Cto 50°C(41°Fto 122°F) 5°Cto 50°C(41°Fto 122°F)
Relative humidity 10% to 95% non-condensing 10% to 95% non-condensing
Altitude Sea level to 4900 m (16,000 ft) Sea level to 4900 m (16,000 ft)
Power Supply Hub provides Provided by:
H7082–AB
Input Power 7 W @ +5 Vdc 7 W @ +5 Vdc
Connectors RJ-45 RJ-45
Agency certification CE, CSA, FCC, TÜV, CE, CSA, FCC, TÜV,
UL, VCCI, VDE UL, VCCI, VDE
Acoustics: Preliminary No acoustic noise No acoustic noise
declared values per ISO
9296 and ISO 7779
Schallemissionswerte: keine meßbaren Schallemissionen keinemeßbarenSchallemissionen
Vorläuge Werteangaben
nach ISO 9296 und ISO
7779/DIN EN27779
Associated Documents
DEChub 900 MultiSwitch This manual provides overview, installation, and problem
Owner’s Manual solving information for the DEChub 900 MultiSwitch.
DECrepeater 900TL 15