Digital Equipment DECserver 900GM User manual

DECserver 900GM and 900GMx
Installation
Part Number: EK–DSRVY–IN. C01
February 1997
This manual describes how to install the
DECserver 900GM and DECserver 900GMx modules.
Revision/Update Information: This is a revised manual.

Copyright
February 1997
The information in this document is subject to change without notice and should not be construed as a
commitmentbyDigital EquipmentCorporation. DigitalEquipment Corporationassumes noresponsibility
for any errors that may appear in this document.
Copyright 1997 by Digital Equipment Corporation
All rights reserved. Printed in U.S.A.
Thepostage-paidReader’sComments format thebackof thisdocument requestsyour evaluationof this
document to assist us in preparing future documentation.
The following are trademarks of Digital Equipment Corporation: DEC, DECconcentrator, DECconnect,
DEChub,DEChubONE,DECndu,DECnduPlus,Digital,HUBwatch,OpenVMS,ULTRIX,VAX,VMS,and
the DIGITAL logo.
AT&T is a registered trademark and ST is a trademark of American Telephone and TelegraphCompany.
MS-DOS is a registered trademark of Microsoft Corporation.
All other trademarks are the property of their respective owners.
FCC NOTICE — Class A Computing Device:
This equipment generates, uses, and may emit radio frequency energy. The equipment has been type
testedand foundto complywith thelimits fora ClassA computingdevice pursuantto SubpartJ ofPart 15
of FCC Rules, which are designed to provide reasonable protection against such radio frequency
interferencewhenoperatedinacommercialenvironment.Operationofthisequipmentinaresidentialarea
may cause interference; in which case, measures taken to correct the interference are at the user’s
expense.
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/orindustrial areas. Consequently, when used in a residential area or in an adjacent area
thereto, radio interference may be caused to radios and TV receivers. Read the instructions for correct
handling.
LASER NOTICE – Class 1 Laser Device:
ThelasersinthisequipmentareClass1devices,compliantwithCDRHRules22,CFRSubchapterJ,Part
1040.10, at date of manufacture. Class 1 laser devices are not considered to be hazardous.
CE NOTICE – Class A Computing Device:
Warning!
This is a Class A product. In a domestic environment this product may cause radiointerference, in which
case the user may be required to take adequate measures.
Achtung!
Dieses ist ein Gerät der Funkstörgrenzwertklasse A. In Wohnbereichen können bei Betrieb dieses
Gerätes Rundfunkstörungen auftreten, in welchen Fällen der Benutzer für entsprechende
Gegenmaßnahmen verantwortlich ist.
Attention!
Ceci est un produit de Classe A. Dans un environment domestique, ce produit risque de créer des
interférences radioélectriques, il appartiendraalors à l’utilisateur de prendre les mesures spécifiques
appropriées.

iii
Contents
Safety v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Features 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Panel DECserver 900GM 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Panel DECserver 900GMx 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Back Panel 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the Module 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing Flash RAM 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Module 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LED Descriptions 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Problem Solving Using the LEDs 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Normal Powerup 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Problem Solving 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Problem Solving Using the Seven Segment Display 16. . . . . . . . . .
Cabling 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connector Pin Assignments 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bulk Connector 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H8586-AA 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BN41C-03 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BN41A-03 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BN41B-03 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BN41D-03 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable Compatibility 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H8587-AA Loopback Connector 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

iv
Contents (Cont.)
Product Specifications 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Associated Documents 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
1 Module LED States 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Problem Solving Using the LEDs 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Seven Segment Display Codes 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Maximum Cable Lengths –– DECserver 900GM to Devices 17. . . . . . .
5 68-pin to Four 25-pin DB Octopus Cable Pinout 23. . . . . . . . . . . . . . . . .
6 68-pin to Eight 8-pin MP Octopus Pinout 26. . . . . . . . . . . . . . . . . . . . . . .
7 68-pin to Eight 25-pin DB Octopus Pinout 31. . . . . . . . . . . . . . . . . . . . . .
8 Cable Connections Compatible with the DECserver 900GM 35. . . . . . . .
9 Operating Specifications 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10 Acoustical Specifications 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

v
Safety !
Any warning or caution that appears in this manual is defined as follows:
WARNING Contains information to prevent personal injury.
VORSICHT Enthält Informationen, die beachtet werden müssen,
um den Benutzer vor Schaden zu bewahren.
DANGER Signale les informations destinées à prévenir les acci-
dents corporels.
AVISO Contiene información para evitar daños personales.

vi
Safety !(Cont.)
WARNING !To avoid personal injury or damage to equipment, do not
install the module into a DEChub 900 or DEChub ONE
unlessthemoduleiscompletelyassembled,withtheenclo-
sure, bezel, and all faceplates in place. [Page 7.]
VORSICHT Um den Benutzer vor Schaden zu bewahren und eine
Beschädigung des Geräts zu vermeiden, muß das Modul
erst vollständig mit Gehäuse, Blende und Anschlußdose
montiert werden, bevor es in ein System DEChub 900
oder DEChub ONE eingebaut wird.
DANGER Pour éviter tout risque d’accident corporel ou de dom-
mage àl’équipement, n’installez le module dans un
DEChub 900 ou un DEChub ONE que s’il est complète-
ment monté et que le boîtier,le couvercle et les caches
ont été mis en place.
AVISO Para evitar daños personales o al equipo, no se debe
instalar el módulo en un DEChub 900 o un DEChub ONE
a menos que el módulo esté completamente ensamb-
lado, con la carcasa, la tapa y las placas de conexión en
sus respectivos lugares.

1DECserver 900GM Installation
Introduction
TheDECserver900GMisanetworkaccessserverthatsupportsupto16fullmodem
controlports, or32 eight–wirepartialmodemcontrolports. TheDECserver 900GMx
is identical to the DECserver 900GM, except that it supports up to 8 full modem
controlports,or16eight–wirepartialmodemcontrol ports.Theportsmaybeusedto
connect asynchronous devices including terminals, printers, modems, or PCs to an
Ethernet local area network (LAN). Both systems operate in a DEChub 900
Multiswitch or as a standalone access server.
Except where noted, all references to the DECserver 900GM also apply to the
DECserver 900GMx.
NOTE: Inthismanual,thetermEthernetisDigital’stermforitsproductcompatibility
with the ISO 8802-3/ANSI/IEEE 802.3 standards and the Ethernet
standards for Carrier Sense Multiple Access with Collision detection
(CSMA/CD) local area networks (LANs).
To give your workgroup LAN media flexibility and connectivity, the module can be
configured into a DEChub 900 MultiSwitch (also referred to in this manual as the
DEChub 900). One or more DECserver 900GM modules can be installed into the
DEChub 900 (a maximum of 8 DECservers can be present; however, to connect to
the network, there must also be at least one repeater or one bridge in the
configuration).Themodulecanalsoserveasastandaloneunitwhenconfiguredwith
a DEChub ONE docking station (see the
DEChub ONE installation manual).
When the module is installed into a DEChub 900, the module’s hot-swap capability
allows you to install or remove the module without turning off power to the DEChub
900.
The DECserver 900GM is configured with four 68-pin D-connectors (two for the
DECserver900GMx),andprovidesfullorlimitedmodemcontrol.Eachportsupports
16 baud rates from 75 baud to 115.2 Kbaud. The DECserver 900GM includes 4
megabytes (MB) of standard memory, and can be expanded to 8 MB.
1Throughout this manual, the term DEChub ONE refers to the DEChub ONE or the
DEChub ONE-MX docking station unless otherwise specified.

2 DECserver 900GM Installation
Introduction (Cont.)
Features
Your DECserver 900GM and 900GMx modules include the following features:
•Access to ThinWire 10base2 segment in the DEChub 900 MultiSwitch or in the
DEChub ONE docking station.
•Backplane access to multiple LANs through one of six flexible channels in the
DEChub 900.
•Automatic module self-test at powerup.
•In-band Simple Network Management Protocol (SNMP) management.
•Built-inSNMPagentthatsupportsthefollowingmanagementinformationbases
(MIBs):
—Ethernet-like Interface Type MIB (RFC 1398)
—DEChub 900 Public Common MIB
•Manageability using any generic SNMP management application that supports
the MIBs listed above.
•User-friendly advanced Graphical User Interface (GUI) manageability with Digi-
tal’s HUBwatch Network Management Station (NMS) application.

3
DECserver 900GM Installation
Front Panel–DECserver 900GM
1) Power LED — Lights when the module has
power.
2) Module OK LED — Lights when the
module passes self-test.
3) Network OK LED — Lights when the module
has an active network connection.
4) Network Activity LED — Indicates network
traffic level.
5) Seven-Segment Display — Provides error and
status information. For more information, see the
section titled Problem Solving Using the Seven Seg-
ment Display.
6) Flash RAM Slot — Provides an opening in which to
insert the Flash RAM card.
7) Address Label — Contains the module’s 48-bit
Ethernet Hardware Address.
8) Reset Switch — Resets the module to factory de-
faults.Toreset: whileturningonthepower,pressand
hold the reset switch until the Module OK LED
flashes, or if the DECserver 900GM is in operational
mode (the seven-segment display shows the “race
track” pattern), hold the switch for 10 seconds. The
module reboots with factory defaults.
9) Bulk Connectors — Four 68-pin connectors, each
providing 4 full modem control ports or 8 partial mo-
dem control ports. When using all four connectors,
youcanconfigurethesecablestoprovideportsinthe
following combinations:
Full 0 4 8 12 16
Partial 32 24 16 8 0
12
4
3
C
A
B
D
25-32
9-16
17-24
1-8
56
7
8
9
LKG-09727–94I

4 DECserver 900GM Installation
Front Panel (Cont.)
NOTES: You can mix port types on connectors A through D but
you cannot mix port types on any single connector.
You can change port type cables at any time but you
must reboot the module when you do so.

5
DECserver 900GM Installation
Front Panel–DECserver 900GMx
1) Power LED — Lights when the module has
power.
2) Module OK LED — Lights when the
module passes self-test.
3) Network OK LED — Lights when the module
has an active network connection.
4) Network Activity LED — Indicates network
traffic level.
5) Seven-Segment Display — Provides error and
status information. For more information, see the
section titled Problem Solving Using the Seven Seg-
ment Display.
6) Flash RAM Slot — Provides an opening in which to
insert the Flash RAM card.
7) Address Label — Contains the module’s 48-bit
Ethernet Hardware Address.
8) Reset Switch — Resets the module to factory de-
faults.Toreset: whileturningonthepower,pressand
hold the reset switch until the Module OK LED
flashes,oriftheDECserver900GMxisinoperational
mode (the seven-segment display shows the “race
track” pattern), hold the switch for 10 seconds. The
module reboots with factory defaults.
9) Bulk Connectors — Two 68-pin connectors, each
providing 4 full modem control ports or 8 partial mo-
dem control ports. When using all four connectors,
youcanconfigurethesecablestoprovideportsinthe
following combinations:
Full 0 4 8
Partial 16 8 0
12
4
3
A
B
9-16
1-8
56
7
8
9
LKG-09727–94I

LKG-09728-94I
7
1
2
3
4
5
6
6 DECserver 900GM Installation
Back Panel
1) Locking tab — Locks the module in the DEChub
900 backplane or in the DEChub ONE. It also
contains the hot-swap switch lever.
2) 48-pin connector — Provides network and power
connections to the module when the module is
installed in a DEChub 900 or DEChub ONE.
3) Grounding bolt — Provides a chassis grounding
connection between the module and a DEChub.
4) Manufacturing label — Lists the module’s part
number, serial number, revision level, and power
requirements.
5) 160-pin connector — Provides network and
power connections to the module when the module
is installed in a DEChub 900 or DEChub ONE.
6) Mounting tab — Secures the module to the
backplane when the module is installed in a
DEChub 900 or DEChub ONE.
7) Grounding fingers — Provides additional chassis
grounding between the module and a DEChub 900
or DEChub ONE.

7
DECserver 900GM Installation
Installing the Module
The module hot-swap feature allows you to install the module into the DEChub
900 without turning off power to the DEChub 900. Seating the module initiates
the powerup sequence if enough power is available.
WARNING !To avoid personal injury or damage to equipment, do not
install the module into a DEChub 900 or DEChub ONE
unlessthemoduleiscompletelyassembled,withtheenclo-
sure, bezel, and all faceplates in place.
1Compare your module’s power
requirements with the values
showninthe Hub Managerstatus
display (see examples).
NOTE: The 12V power in the DEChub 900 is derived from the 15V power source.
Although it is listed separately in the product specifications, the 12V
requirements are included in the 15V power total.
Module’s Manufacturing
Label (Example)
If any of the module’s power require-
ments exceed the values shown in
the status display, add another pow-
er supply (see the
DEChub 900
MultiSwitch Owner’s Manual).
Hub Manager Status
Display (Example)
LKG–9062–94I
Available: 90.5 W
5V: 13.0 A, 15V: 3.5 A
20.0 W
5 V
12 V
15 V
4.0 A
0.1 A
0.5 A

8 DECserver 900GM Installation
Installing the Module (Cont.)
2Seat the module into the DEChub
900 MultiSwitch.
a. Place the module’s mounting
tab into a mounting slot on the
DEChub 900.
b. Pivot the module on the mount-
ing tab and align the connec-
tors.
c. Firmlypushthemoduleontothe
backplane connectors until the
release lever clicks.
d. Pressdownonthereleaselever
to ensure that it is locked.
3Verify that the module’s Power
LED and the Module OK LED
light (within approximately 2
minutes).
a. The Power LED lights when
the power is applied, then the
module performs a self-test.
b. After the module completes
the self-test, the Module OK
LED lights and remains lit.
c. The timing depends on the amount of memory installed in the module and the
length of time needed to load the network access software.
NOTE: Refer to the section titled Problem Solving Using the LEDs if the LEDs do
not operate as described.
Mounting
tab
LKG–8711–93I
Release lever
clicks when
module is
seated.
Hub Manager
status display
LKG–8760-93I

9
DECserver 900GM Installation
Installing the Module (Cont.)
4Connect the port cables as required.
Connect up to four 68-pin bulk connector cables.
NOTE: All cables should have been installed, tested, and tagged at
the site before you perform this installation.
a. Insert the bulk connector plug
into the port connector on the
module.
b. Using a flat-blade screwdriver,
tighten the two screws at the
ends of the plug.
NOTE: To disconnect the bulk cables, use a flat-blade screwdriver to
loosenthetwoscrewsattheendsoftheplug,thendisconnect
the cable.
NOTE: You must reboot the DECserver 900GM after changing the
bulk cable type on a port from a full modem control cable to a
partial modem control cable or data lead only connector, or
vice versa.
LKG–8761-93I

10 DECserver 900GM Installation
Installing Flash RAM
If you use a Flash RAM card for loading the operational software, perform the following:
1Insert the Flash RAM card into the Flash RAM slot on the front of the
module.
a. TheDigitallabelshouldbeonthesamesideastheDECserver900GMlogoon
the front panel of the module.
b. When properly inserted, the Flash RAM card protrudes from the front panel
about 1/4 inch. The Flash RAM card is keyed and cannot be inserted
improperly.
LKG–8091-93I
The Flash RAM card can be hot swapped and may be inserted or removed at anytime.
Ifyou arebooting fromthe FlashRAM card,insert itbefore poweringthe moduleor during
the self-test phase.
Once you boot the DECserver 900GM, the card may be left in place or removed.

11
DECserver 900GM Installation
Removing the Module
1Disconnect all the cables from
the module.
a. To remove the bulk cables,
use a flat-blade screwdriver to
loosen the two screws at the
ends of the plugs, then
disconnect the cable.
2Unseat the module from the
DEChub 900 MultiSwitch.
a. Lift the release lever located
on the top of the DEChub 900
mounting slot.
b. Pivot the module back on its
bottom mounting tab, and
remove the module from the
backplane.
LKG–8761-93I
Mounting
tab LKG–8717-93I
Lift release
lever

12 DECserver 900GM Installation
LED Descriptions
The module’s LEDs provide dynamic indications of its status.
Table 1 shows the static states that are possible for each of the module’s LEDs.
Table 1 Module LED States
LED
Name Off On Flashing
Power No power to the
module. Module receiving power. Faulty power connection or
insufficient power.
Module
OK After approximately 2 minutes, module
failed self test.
Module passed
self-test. Non-fatal self-test failure. Unit may
still be operational.
Network
OK Module is not
connected to a
properly terminated
and enabled LAN
through the
DEChub 900 or via
the AUI port on the
DEChub ONE.
Network
connection is
operational.
Network
connection is
disabled by
network
management.
Network
Activity No network activity. Network has heavy
traffic. Flashes more rapidly and
appears brighter
as network traffic
increases.

DECserver 900GM Installation 13
Problem Solving Using the LEDs
When diagnosing a problem with the module, note that the problem is often
indicated by the combined states of the module’s LEDs. Table 2 lists the states of
the LEDs for various error conditions that can occur during initial installation of the
device, along with probable causes and steps you can take to correct the condition.
Normal Powerup
When power to the module is initially turned on, the following events occur:
1. The Power LED lights and remains lit. All other LEDs light and then turn off.
This verifies that the individual LEDs are operational.
2. The module initiates its built-in self-test.
3. After the self-test completes successfully (within approximately 2 minutes),
the Module OK LED lights and remains lit.
4. The remaining LEDs indicate their operational status as described in Table 2.
Problem Solving
Table 2 lists probable causes and corrective actions you can take if the module
LEDs do not function properly.

14 DECserver 900GM Installation
Problem Solving Using the LEDs (Cont.)
Table 2 Problem Solving Using the LEDs
Symptom Probable Cause Corrective Action
Power LED is off. The module is not
receiving power. Ensure that the release lever (if instal- ling into a DEChub 900) or the locking
L-bracket screw (if installing into a
DEChub ONE) is locked securely.
If installing the module into a
DEChub 900, check the power status
on the Hub Manager status display. If
enough power is available, lift the re-
lease lever (if installing the module
into a DEChub ONE, loosen the lock-
ing L-bracket screw). Remove the
module.
Inspect the module’s 48-pin and
160-pin connectors for bent, broken,
or dirty pins. If any pins are broken or
bent, replace the module.
If no pins are broken or bent, reinstall
the module into the DEChub.
If the problem persists, replace the
module.
Power LED
is flashing. The module connection is faulty. Lift the release lever, then reseat the module.
Faulty DEChub 900
slot connection. Reinstall the module into another slot.
DEChub power
supply is faulty. If the module is installed in a DEChub 900, replace the power sup-
ply. If the module is installed in a
DEChub ONE, replace the
DEChub ONE.
(continued on next page)