Digital Media 900TL User Manual
DECmau 900TL
INSTALLATION
LKG–8137-93I
DEChub ONE MAU 900TL
The DECmau 900TL is a T oken Ring Multistation Access Unit (MAU). As a member
of Digital’s T oken Ring product family , it operates in a DEChub 900 MultiSwitch, or a
single-slot hub (DEChub ONE MAU 900TL). The MAU connects up to eight stations
using 100-ohm shielded or unshielded cable with RJ45 connectors, and 150-ohm
IBM Type 1 data cable using an impedence matching transformer cable. It operates
at 4 or 16 Mb/s and incorporates speed detection. The MAU can also be managed
by optional HUBwatch management software.
EK–DTMAU–IN. A01
DECmau 900TL
PK–02580–IL
Copyright
EK–DTMAU–IN. A01
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 Corporation 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.
The following are trademarks of Digital Equipment Corporation:
DEC, DEChub, DEChub ONE, DECmau, DECrepeater, Digital, the DIGITAL logo,
HUBwatch, and MultiSwitch.
FCC NOTICE – Class A Computing Device:
This equipment generates, uses, and may emit radio frequency energy. The equipment has been
type tested and found to comply with the limits for a Class A computing device pursuant to Subpart
J of 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.
July, 1993
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 , when used in a residential area or in an adjacent area thereto, radio interference may
be caused to radios and TV receivers, etc.
Read the instructions for correct handling.
2 DECmau 900TL
Front Panel
1 2
3
4
5
6
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1 ) Power LED. Lights when the MAU has power.
2 ) Module OK LED. Lights when the MAU passes its
self-test. If the MAU fails its self-test, the OK LED is
off.
3 ) Ring A/B LEDs. In a hub, either the A LED or the B
LED is on to show the ring. In a standalone MAU,
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 ) Eight Lobe LEDs. Lights when a station has access
to the network.
6 ) Eight Lobe Connectors. Connects a station to the
network. The MAU connects up to eight stations with
shielded or unshielded 100-ohm cable, and 150-ohm
IBM Type 1 data cable using an impedence matching
transformer cable (Digital part number BN26T-03).
7 ) Reset Switch. Resets the MAU to factory defaults.
To reset: while turning on the power, press the reset
switch with a pen or screwdriver.
Notes:
The DECmau 900TL has speed detect, which
ensures the integrity of the network. At startup, a
MAU determines the ring speed based on the
speed settings of the majority of the stations on the
ring and the Ring Out port. In a hub, the MAU then
connects to the appropriate ring in the hub. After
startup, speed detect prevents stations with the
wrong speed setting from connecting to the network.
7
Network management can override any of the
MAU’s factory default settings.
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DECmau 900TL 3
Rear Panel of DEChub ONE MAU 900TL
Note:
The rear panel shown here is used only when the MAU
is in a single-slot hub configuration.
1
1 ) Ring In LED. Lights with a Ring In connection.
2
2 ) Ring Out LED. Lights with a Ring Out connection.
3) Power Connector. Provides power connection for the
3
MAU.
4 ) Ring In Connector. Connects Ring In to the Ring
Out connector of a MAU or repeater.
4
5 ) Ring In Autowrap Switch. Determines whether the
MAU automatically loops back when it detects a
disconnected link on Ring In. If the Ring In port
5
connects to a device with Digital’s Autowrap, set the
switch to 1 to enable Autowrap. If the Ring In port
connects to a device without Digital’s Autowrap, set
6
the switch to 0 to disable Autowrap.
6 ) Ring Out Connector. Connects Ring Out to the Ring
7
In connector of a MAU or repeater.
7 ) Ring Out Autowrap Switch. Determines whether the
MAU automatically loops back when it detects a
disconnected link on Ring Out. If the Ring Out port
connects to a device with Digital’s Autowrap, set the
8
switch to 1 to enable Autowrap. If the Ring Out port
connects to a device without Digital’s Autowrap, set
the switch to 0 to disable Autowrap.
8 ) Not used. Reserved for out-of-band network
management.
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4 DECmau 900TL
Installing a MAU in a DEChub 900 MultiSwitch
When you install a MAU in a DEChub 900 MultiSwitch, you do not have to turn off the hub power .
1
Remove the single-slot hub (if necessary).
If you want to install a DEChub ONE MAU 900TL in a hub,
you need to remove the single-slot hub.
a. Loosen the screw on the single-slot
hub until it disengages.
b. With one hand holding the front of
the MAU, and your other hand
holding the single-slot hub,
carefully pull the two units apart.
2
Install the MAU in the hub.
a. Align the MAU’s 48-pin connector
with any available 48-pin slot on the
The release lever is
hub.
lifted and clicks
back into place
as the module
b. Place the MAU’s bottom mounting
tab into the mounting slot on the hub.
is seated.
c. Rock the MAU into place. You hear a
‘‘click” when the MAU is seated.
Mounting
tab
DECmau 900TL 5
LKG–8139-93I
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