3Com NETBuilder II User manual

®
NETB
UILDER
II
®
HSS RS-232
3-P
ORT
DCE/DTE M
ODULE
I
NSTALLATION
G
UIDE
Part No.09-0606-001
Published August 1996

ii
3Com Corporation
■
5400 Bayfront Plaza
■
Santa Clara,California
■
95052-8145
© 3Com Corporation, 1996.All rights reserved.No part of this documentation may be reproduced in any form or by any means or used to make any derivative
work (such as translation,transformation,or adaptation) without permission from 3Com Corporation.
3Com Corporation reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com
Corporation to provide notification of such revision or change.
3Com Corporation provides this documentation without warranty of any kind,either implied or expressed,including,but not limited to,the implied warranties of
merchantability and fitness for a particular purpose.3Com may make improvements or changes in the product(s) and/or the program(s) described in this
documentation at any time.
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If you are a United States government agency, then this documentation and the software described herein are provided to you subject to the following restricted
rights:
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Restricted Rights Legend: Use,duplication or disclosure by the Government is subject to restrictions as set forth in subparagraph (c) (1) (ii) for restricted Rights in
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For civilian agencies:
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Restricted Rights Clause at 48 C.F.R. 52.227-19 and the limitations set forth in 3Com Corporation’s standard commercial agreement for the software.Unpublished
rights reserved under the copyright laws of the United States.
If there is any software on removable media described in this documentation,it is furnished under a license agreement included with the product as a separate
document,in the hard copy documentation,or on the removable media in a directory file named LICENSE.TXT. If you are unable to locate a copy,please contact
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Unless otherwise indicated,3Com registered trademarks are registered in the United States and may or may not be registered in other countries.
3Com and NETBuilder II are registered trademarks of 3Com Corporation.3TECH is a trademark of 3Com Corporation.3ComFacts is a service mark of 3Com
Corporation.
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Other brand and product names may be registered trademarks or trademarks of their respective holders.
Guide written by Francisco Razo.Edited by Amy Guzules.Technical illustration by Linda Briscoe and Debra Knodel.Production by Ramona Boersma

A BOUT T HIS G UIDE
Introduction
This guide describes how to install,cable,maintain,and troubleshoot the HSS RS-232
3-Port DCE/DTE module for the NETBuilder II
®
system.The information in this guide
applies to all NETBuilder II chassis.
For more information about the NETBuilder II base system installation,refer to the
NETBuilder II Base System Installation Guide .
This guide is intended for the system administrator,network equipment installer,or
network manager who is responsible for installing and managing the network
hardware.It assumes a working knowledge of network operations,but it does not
assume prior knowledge of 3Com
®
internetworking equipment.
If the information in the release notes shipped with your product differs from the
information in this guide,follow the release notes.
Conventions
Table 1 lists the notice icons that are used throughout this guide,and Table2 lists text
conventions that are also used throughout this guide.
Table 1 Notice Icons
Icon Type Description
Information Note Information notes call attention to important features or
instructions.
Caution Cautions alert you to personal safety risk, system damage,
or loss of data.
Warning Warnings alert you to the risk of severe personal injury.

2 A
BOUT
T
HIS
G
UIDE
Table 2 Text Conventions
Convention Description
“Enter” vs. “Type” When the word “enter” is used in this guide, it means type something, then press the Return or
Enter key. Do not press the Return or Enter key when an instruction simply says “type.”
“Syntax” vs. “Command” When the word “syntax” is used in this guide, it indicates that the general form of a command
syntax is provided. You must evaluate the syntax and supply the appropriate port, path, value,
address, or string; for example:
Enable RIPIP by using the following syntax:
SETDefault !<port> -RIPIP CONTrol = Listen
In this example, you must supply a port number for !<port>.
When the word “command” is used in this guide, it indicates that all variables in the command
have been supplied and you can enter the command as shown in text; for example:
Remove the IP address by entering the following command:
SETDefault !0 -IP NETaddr = 0.0.0.0
For consistency and clarity, the full form syntax (upper- and lowercase letters) is provided. However, you
can enter the abbreviated form of a command by typing only the uppercase portion and supplying the
appropriate port, path, address, value, and so forth. You can enter the command in either upper- or
lowercase letters at the prompt.
Text represented as screen
display This typeface
is used to represent displays that appear on your terminal screen, for
example:
NetLogin:
Text represented as commands This typeface is used to represent commands that you enter, for example:
SETDefault !0 -IP NETaddr = 0.0.0.0
Keys When specific keys are referred to in the text, they are called out by their labels, such as “the Return
key” or “the Escape key,” or they may be shown as [Return] or [Esc].
If two or more keys are to be pressed simultaneously, the keys are linked with a plus sign (+), for
example:
Press [Ctrl]+[Alt]+[Del].
Italics Italics are used to denote new terms or emphasis .

1
I
NSTALLATION
This chapter describes how to install the HSS RS-232 3-Port DTE/DCE module into the
NETBuilderII® system and includes the following procedures:
■
Preparing for installation
■ Changing the module jumper settings if connecting one or more of the cable
connectors to data terminal equipment (DTE)
■
Installing the module in a NETBuilder II 4- or 8-Slot chassis
■
Installing the module in a NETBuilder II 8-Slot Extended chassis
■
Cabling the module
You must have NETBuilder software version 7.2 or later and CEC firmware version 2.1 or
later to use the module.If you want to change a port from DTE to data communication
equipment (DCE),you must have NETBuilder software version9.1 or later.
In order to use the module with DTE devices,you must order an adapter kit (3C6044)
that contains three DTE-to-DCE adapters.
For information about the features of the HSS RS-232 3-Port DTE/DCE module,refer to
Chapter2.
Before Installing
the Module
To prepare to install the module into the NETBuilder II system,follow these steps:
1 Observe appropriate electrostatic discharge (ESD) precautions.
ESD can damage circuit board components.Failures resulting from ESD may not be
covered under your warranty.To prevent this,follow these handling procedures:
■
Keep the module in its antistatic shielded bag until you are ready to install.
■
Do not touch pins,leads,or solder connections on the module.
■
Handle the module by the edges only.
■
Store or ship the module in static-protective packaging.
Observe proper grounding techniques when handling the module:use a foot strap
and grounded mat,or wear a grounded static discharge wrist strap.

1-2 C
HAPTER
1: I
NSTALLATION
2 Inspect the module for shipping damage.
If you find any damage,contact the shipping company to file a report.If the module
must be returned to your network supplier,ship it in its original shipping carton.If the
original carton was damaged in shipment,repack the module in a carton that provides
equivalent protection.
3 Verify that the shipping carton contains the following items:
■
HSS RS-232 3-Port DTE/DCE module
■
HSS RS-232 3-Port cable
■ This guide
You can order an adapter kit (3C6044) that contains DTE-to-DCE adapters to connect
the module to a DTE device,such as a mainframe or a cluster controller.The adapter
kit contains three DTE-to-DCE adapters and a release note that shows the adapter
pin-outs.
If an item is missing from an undamaged carton,contact your network supplier.
4 Write down the serial number and the three MAC addresses from the label on the
component side of the module on the following line.You will need this information if
you have to contact your network supplier.
Serial number example:S/N:1DN12345
MAC addresses example:0800021A4B5C,0800021A4B5D,0800021A4B5E
The MAC addresses are also encoded in the module EEPROM.Use the procedure in the
NETBuilder II Base System Installation Guide to display the MAC addresses encoded in
the EEPROM.
Software/Hardware
Compatibility
Verify that you have NETBuilder software version 7.2 or later and CEC firmware version
2.1 or later.
If you want to change a module port setting from DTE to DCE so that you can connect
to a DTE device,you must be running NETBuilder software version 9.1 or later.
®
HSS RS-232
3-PORT
STATUS
Serial number label
MAC addresses label

Changing the Jumper Settings 1-3
I f you change a port setting from DTE to DCE,you must set the -PATH Service CLock
parameter from External to Internal for that port.Refer to the CLock parameter in the“Path
Service Parameters”chapter in the NETBuilder Family Bridge/Router Reference Guide for
instructions.
Changing the
Jumper Settings
This section describes how to change the jumpers to enable the module to connect to
DTE devices.Skip this section if you are using only DCE devices.
The jumpers on the module are factory-set to support connecting the module ports to
DCE devices with an RS-232 3-Port cable.Typical DCE devices are modems,ISDN
terminal adapters,and CSU/DSUs.
To connect one or more of the connectors on the 3-Port cable to a DTE device,such as
a cluster controller or a mainframe computer,change the jumper settings as follows:
1 Remove the jumper located in the E-4 position (see Figure1-1).
2 For the ports you want to connect to DTE devices,move the jumpers from the DTE
row of pins to the DCE row of pins (see Figure 1-1).
CAUTION: When changing jumper settings on the module and when cabling the
module to devices,be aware that when the RS-232 3-Port cable is connected to the
module,the positioning of the three hydra cables carrying the port signals are not
visually in a direct or expected line with the location of the jumpers on the module to
which the signals correspond.(See Figure1-1.)
When any one of the three ports on the module are changed from DTE to DCE,the
test-mode configuration is lost for all three ports.
Figure1-1 shows the jumper in the E3 slot for port J3(C) set to DCE and shows two
ports set to DTE.

1-4 C
HAPTER
1: I
NSTALLATION
Figure1-1 Changing the Jumper Settings to Connect to DTE Devices
When cabling one or more of the module ports to a DTE device,you need to attach a
DTE-to-DCE adapter available from 3Com to the connector of each of the three cables
that is to connect to a DTE device.This procedure is described in “Cabling Instructions”
on .
You also must set the -PATH Service CLock parameter from External to Internal for the port
that you are connecting to a DTE device.Refer to the CLock parameter in the“Path Service
Parameters”chapter in the NETBuilder Family Bridge/Router Reference Guide for
instructions.
Installing the
Module in a 4- or
8-Slot Chassis
You can install up to three HSS RS-232 3-Port DTE/DCE modules at a time into a
NETBuilder II 4-Slot chassis and up to seven in an 8-Slot chassis.
■
You will need a small flat-blade screwdriver.
■ You can safely install a module without turning off or rebooting the NETBuilder II
system.
To install the module into a NETBuilder II 4- or 8-Slot chassis,follow these steps:
1 Remove the filler panel from the I/O slot you have selected.
You do not need to remove the cable strain-relief bracket that came with your
NETBuilderII chassis.
DTE
DCE
E2
E4
E1 E3
Jumper E2 set for DTE
(corresponds to cable
connector J2 (B))
Jumper E1 set for DTE
(corresponds to cable
connector J1 (A)) Jumper E4 off Jumper E3 set for DCE
(corresponds to cable
connector J3 (C))
STATUS
HSS RS-232
3-PORT
DTE/DCE
®
J1 (A) J2 (B)
J3 (C)

Installing the Module in a 4- or 8-Slot Chassis 1-5
WARNING: Only remove the filler panel from the I/O slot that will house the RS-232
3-Port module.All unused I/O slots require filler panels to maintain proper cooling of
the unit and regulatory compliance.Failure to cover open slots can result in
overheating of the NETBuilder II system and voiding of the warranty.
2 Insert the module into the slot.
3 Hand-tighten the captive screws.Then gently tighten them with a small (1/8 - 3/16”)
screwdriver.Do not overtighten.
A solid connection of the connector/LED panel to the chassis is required for proper
operation.Do not use the screws to force the board into place.
Refer to “Cabling the Module”to finish the installation.
1
2
3
4
8
7
6
5
A
SINGLE SINGLE
B
®
FDDI PHY
SINGLE-MODE
COMPLIES WITH 21 CFR
1040.10 & 1040.11
3COM CORP. BLDG. 300
SANTA CLARA, CA
NOVEMBER 1993
A STATUS
BYPASS
STATUS
B STATUS
®
FDDI MAC
Loosen captive screws
with small screwdriver
Slide filler panel
out of rear panel
Push tab to the side
a
b
c
CONSOLE AUXILIARY DIAGNOSTIC
4321
SELF TEST CPU ACT PKT FWD
BOOT POWER STATUS
®
CEC
2
3
4
Make sure module
is right side up
1
2
Slide board
along guide
rails until it
engages
ejector tab
notch
3
A STATUS
BYPASS
STATUS
B STATUS
®
FDDI MAC
Grasp left and
right sides of
LED panel
Push ejector tab closed
until the module is flush
with the chassis
4
®
HSS RS-232
3PORT
STATUS

1-6 C
HAPTER
1: I
NSTALLATION
Installing the
Module in an
Extended Chassis
You can install up to seven HSS RS-232 modules into a NETBuilder II 8-Slot Extended
chassis.
■
You will need a small flat-blade screwdriver.
■
You can safely install a module without turning off or rebooting the NETBuilder II
system.
To install the module into a NETBuilder II 8-Slot Extended chassis,follow these steps:
1 Remove the card carrier from the I/O slot you have selected.
The card carrier acts as a filler panel when a module is not installed.
You do not need to remove the cable strain-relief bracket that came with your
NETBuilderII chassis.
WARNING: Only remove the card carrier from the I/O slot that will house the RS-232
3-Port module.All unused I/O slots must be covered by a card carrier to maintain
proper cooling of the unit and regulatory compliance.Failure to cover open slots can
result in overheating of the NETBuilder II base system and voiding of the warranty.
2 Install the module onto the card carrier.
Push ejector tabs apart
b
Slide card carrier
out of chassis
c
Loosen top and bottom
captive screws with a
screwdriver. Do not
loosen center captive
screw.
a
CONSOLE AUXILIARY DIAGNOSTIC
4321
SELF TEST CPU ACT PKT FWD
STATUS
®
CEC

Installing the Module in an Extended Chassis 1-7
3 Insert the card carrier into the slot.
!WARNING!
DO NOT TURN UNIT ON
WITHOUT A BLANKING
PLATE OR I/O MODULE
IN EVERY SLOT. UNIT
FAILURE MAY RESULT.
DO NOT LOOSEN THIS
SCREW WHEN REMOVING
MODULE FROM CHASSIS
DO NOT LOOSEN THIS
SCREW WHEN REMOVING
MODULE FROM CHASSIS
Tighten screwLoosen screw
Remove
locking
pin
Remove filler panel from card carrier Install module in card carrier
®
a
bc
STATUS
Insert locking pin
from bottom of plate.
Plate
Module
d
CONSOLE AUXILIARY DIAGNOSTIC
4321
SELF TEST CPU ACT PKT FWD
STATUS
®
CEC
®
4
Grasp left and right sides of LED panel
b
Turn the module vertically so the
3Com logo is on the bottom
c
Make sure module is right side up
a
Slide board along guide rails until it
engages ejector tab notches
d
Push ejector tabs towards the LED
panel until the module is flush with
the chassis
e
®
FAST ETHERNET
100BASE-TX
STATUS

1-8 C
HAPTER
1: I
NSTALLATION
4 Hand-tighten the captive screws.Then gently tighten them with a small (1/8 - 3/16”)
screwdriver.Do not overtighten.
A solid connection of the connector/LED panel to the chassis is required for proper
operation.Do not use the screws to force the board into place.
Refer to “Cabling the Module” to finish the installation.
Cabling the Module This section contains compliance,cabling,and pinout information for the RS-232
3-Port cable and the DTE-to-DCE adapter,which are used to cable the RS-232 3-Port
module to DCE and DTE devices.
Cable Compliance Table1-1 lists the supported cabling emissions compliance.
CAUTION:Although each end of the DTE-to-DCE adapter has a 25-pin socket connector,
you must attach the end of the adapter labeled“NB-II”to the 25-pin connector on the
RS-232 3-Port cable.Connect the other end of the adapter labeled“To DTE”to the 25-pin
connector on the DTE device (such as a cluster controller).
Cabling Guidelines The 50-pin socket on the HSS RS-232 3-Port cable connects to the 50-pin connector
on the HSS RS-232 3-Port DTE/DCE module.The three 25-pin connectors at the other
end of the 3-port cable connect to RS-232 connectors on a DCE device (such as a
modem,ISDN terminal adapter,or a CSU/DSU).
To connect one or more of the three 25-pin connectors on the 3-port cable to a DTE
device (such as an IBM cluster controller or an IBM mainframe computer),you must
first change the port’s jumper setting from DTE to DCE correctly as described in
“Changing the Jumper Settings” ,and attach a DTE-to-DCE adapter provided by 3Com
to the corresponding cable connector.
Table 1-1 Cable Emissions Compliance
Emissions Compliance
Cable Type Connectors FCC Class A
VCCI Class A EN55022 Class B VDE Class B
HSS RS-232 3-Port cable 50-pin socket at one end
of the cable to connect to
the 50-pin connector on
the RS-232 module.
Three 25-pin RS-232
connectors at the other
end of cable to connect to
devices with RS-232 ports.
Yes Yes
DTE-to-DCE adapter 25-pin socket connectors
at either end of adapter
(one labeled “To DTE” and
the other “NB II ”) for the
module port to connect to
a DTE device. (See the
CAUTION next)
Yes Yes

Cabling the Module 1-9
The cabling instructions in the next section describe how to connect the HSS RS-232
3-Port module to DCE and DTE devices.
Cabling Instructions To cable the module to DCE and DTE devices,follow these steps:
1Attach the 50-pin socket connector on the HSS RS-232 3-Port cable to the 50-pin
connector on the module as shown in Figure1-2.
Figure1-2 Attaching the RS-232 3-Port Cable to the Module
2Route the cable through the cable strain-relief bracket as shown in Figure1-3.
Figure1-3 Routing the CableThrough the Cable Strain-Relief Bracket
CAUTION:Because of the weight of the 3-Port cable,use the strain-relief bracket to
decrease the possibility of damage to the module.If the cable is too large to fit in the
bracket along with other NETBuilder II module cables,use cable ties or other means of
strain relief.
3Although you can attach each of the three connectors to an RS-232 interface on a DCE
device such as a modem,ISDN terminal adapter,or CSU/DSU,you do not need to
attach all three connectors.
To attach one of these connectors to a DTE device,you must change the jumper
settings on the module to support a DCE-to-DTE device connection.Refer to
"Changing the Jumper Settings" for information.
®
HSS RS-232
DTE/DCE
3-PORT
STATUS
Hold the connector firmly in place while
hand-tightening the screws on either side.
Route the cable through
these two arms

1-10 CHAPTER 1: INSTALLATION
CAUTION:When changing jumper settings on the module and when cabling the
module to devices,be aware that when the RS-232 3-Port cable is connected to the
module,the positioning of the three hydra cables carrying the port signals are not
visually in a direct or expected line with the location of the jumpers on the module to
which the signals correspond.(See Figure1-1.)
4Attach the end of the DTE-to-DCE adapter labeled“NB II”to the end of the 25-pin
connector on the cable.Connect the end of the adapter labeled“To DTE”to the DTE
device as shown in Figure 1-4.You can connect the adapter end directly to a DB-25
male connector on the DTE device or to a DB-25 male connector on a cable coming
from the DTE device.
CAUTION:Be sure to use the labels on the adapter to connect it properly.It is easy to
connect the adapter incorrectly,because both ends are female DB-25 connectors.
Figure1-4 Attaching the DTE-to-DCE Adapter
Module Connector to
RS-232 Cable Pin
Assignments
You can connect each hydra head of the HSS RS-232 3-Port cable directly to an RS-232
interface.If you need an RS-232 extension cable,refer to Table1-2 for the pin
assignments of the RS-232 cable.
STATUS
HSS RS-232
3-PORT
DTE/DCE
®
To DCE device
To DTE device
To DCE device DTE-to-DCE adapter
TO DTE
NB-II
HSS 3 PORT
DCE ADAPTER
P/N BTI 479
Table 1-2 HSS RS-232 3-Port Module Connector and Cable Pin Assignments
RS-232 Port
Pinout RS-232 Cable Pinout
A B C Signal I/O Signal Description (25 pin male)
1 18 35 GND - Shield 1
2 19 36 TD output Transmit Data 2
5 22 39 TXC input Transmit Signal Element Timing 15
13 30 46 TT output Transmit Signal Element Timing 24
8 25 41 RTS output Request to Send 4
3 20 37 RD input Receive Data 3
9 26 42 CTS input Clear to Send 5
6 23 40 RXC input Receive Signal Element Timing 17
11 28 44 DSR input Data Set Ready 6
10 27 43 DTR output Data Terminal Ready 20
12 29 45 DCD input Receive Carrier Detect 8
16 33 49 LL output Local Loop-back 18
17 34 50 RL output Remote Loop-back 21

Cabling the Module 1-11
CAUTION:All interconnecting cables must be properly shielded to reduce the potential
for interference.Only cables from 3Com are guaranteed to meet emissions standards.If
other cables are used,3Com cannot guarantee compliance.
DTE-to-DCE Adapter
Pin Assignments Figure1-5 lists the pin assignments for the DTE-to-DCE adapter.
Figure1-5 Pin Assignments for the DTE-to-DCE Adapter
15 32 48 RI input Ring Indicate 22
14 31 47 TM input Test Mode 25
7
421 24 38 38 SG SG - -Signal Ground Signal Ground 7
Table 1-2 HSS RS-232 3-Port Module Connector and Cable Pin Assignments
RS-232 Port
Pinout RS-232 Cable Pinout
A B C Signal I/O Signal Description (25 pin male)
To DTE
1
2
3
4
5
6
7
8
17
18
21
22
24
20
1
2
3
4
5
6
7
8
15
17
20
Shield
TXD
RXD
RTS
CTS
DSR
S.G.
DCD
RXC
LL
RL
RI
TXCE
DTR
Shield
TXD
RXD
RTS
CTS
DSR
S.G.
DCD
NB-II
Signal Pin No. Pin No. Signal
TXC
RXC
DTR

2OVERVIEW OF THE MODULE
This chapter describes the features,components,and specifications for an HSS RS-232
3-Port DTE/DCE module.It also illustrates how this module and a NETBuilder II
Bridge/Router might be used in a typical network.
Module Features Table 2-1 summarizes the features of the HSS RS-232 3-Port module.
Table 2-1 HSS RS-232 3-Port DTE/DCE Module Features
Feature Summary
Three ports Provides maximum port density in a single module, saving slots for other
NETBuilder II system modules.
Hot-swap capability Allows you to install or remove and reinstall the module without turning
off the NETBuilder II system.
Cable support Supports RS-232/RS-334.
Clocking External or internal (with the DTE-to-DCE adapter, 3C6044)
Interface RS-232. Can connect to DCE devices and, with a DTE-to-DCE adapter, can
connect to DTE devices.
Self-test and diagnostic
capability Monitors the network and signals network status through the LED.
Accessible information
on the EEPROM Provides HSS RS-232 3-Port DTE/DCE module product information that can be accessed with the monitor utility.

2-2 CHAPTER 2: OVERVIEW OF THE MODULE
Typical Network
Configuration Figure2-1 shows a typical use of the HSS RS-232 3-Port DTE/DCE module and the
NETBuilder II Bridge/Router in a network.
Figure 2-1 Typical HSS RS-232 3-Port DTE/DCE Module and NETBuilder II Bridge/Router Network
Module
Components This section describes the HSS RS-232 3-Port DTE/DCE module components.(See
Figure2-2.)
Figure2-2 HSS RS-232 3-Port DTE/DCE Module Components
RS-232 3-port cables
with DTE-to-DCE adapters
IBM
mainframe
NETBuilder II
NETBuilder II
NETBuilder II
3174 cluster
controller
3270
3270 3270
CSU/DSU
CSU/DSU
SuperStack II
Remote site
Wyoming
Modems or
terminal
adapters
®
HSS RS-232
DTE/DCE
3-PORT
STATUS
Backplane connectors
Connector STATUS LED

Specifications 2-3
STATUS LED The tricolor STATUS LED is located on the front panel.Table 2-2 explains the LED states.
Connectors Table2-3 lists connector information for the module,cable,and DTE-to-DCE adapter.
Specifications Table 2-4 lists the physical attributes of the module,Table 2-5 lists the maximum
current consumption,and Table2-6 lists the module line speeds
.
Table 2-2 LED States
LED Color Indicates
STATUS Green Normal operation
Off Module disabled
Yellow Self-test
Red Fault or reset
Table 2-3 Connectors for the HSS RS-232 3-Port Module,RS-232 3-Port Cable,and DTE/DCE
Adapter
Location Connectors No. of
Pins Purpose
Backplane connector J1 and J3 48-pin Connects module to the core bus
J2 8-pin Power connector
Front panel 50-pin cable connector 50-pin Connects module to HSS RS-232
3-Port cable
HSS RS-232 3-port
cable 50-pin cable connector 50-pin Connects to 50-pin connector on the module
Three RS-232 DB-25
connectors 25-pin Connects module to RS-232 interfaces
DTE-to-DCE adapter DB-25 female connector
on both sides 25-pin Enables a module port to connect to a DTE device
Table 2-4 Physical Attributes
Attribute Description
Length 8.8 in (22.3 cm)
Width 3.9 in (9.9 cm)
Height 0.6 in (1.5 cm)
Weight 8.5 oz. (0.24 kg)
Table 2-5 Maximum Current Consumption
+5 Volts +12 Volts -12 Volts
1.0 amp 0.04 amp 0.04 amp

2-4 CHAPTER 2: OVERVIEW OF THE MODULE
* Line speeds are selected through software. Refer to the software manuals for more information.
Table 2-6 HSS RS-232 3-Port DTE/DCE Module Line Speeds*
RS-232/RS-334 Compliant Cable Length Baud Rate
112 Ft. (34.444 m) 19.2 kbps
35 Ft. (10.670 m) 28.8 kbps
10 Ft. (3.048 m) 56k bps
0 Ft. (HSS RS-232 3-Port cable alone) 128 kbps (supports most terminal adapters)

3TROUBLESHOOTING AND REPLACING
THE MODULE
This chapter describes how to troubleshoot and replace the HSS RS-232 3-Port
DTE/DCE module.Malfunctions that can occur include:
■Self-test failure at startup
■Inappropriate network connection
■Nonworking module
Troubleshooting Table 3-1 describes common malfunctions that can occur with the module,possible
causes,and actions to take.If you are unable to resolve a problem,contact your
network supplier.Refer to AppendixA for information about who to contact in your
area.
Table 3-1 Troubleshooting the HSS RS-232 3-Port DTE/DCE Module
Symptom Cause and Action
The following message is displayed at startup:
HSS RS-232 3-Port Interface: Self
Tests failed - slot X
(The value of X can be 1 through 4 or 1 through 8,
depending on which NETBuilder II chassis you have.)
Self-test failure
■Check to see if the card is inserted completely into the NETBuilder II
chassis.
■Make sure there are no bent pins on the NETBuilder II backplane.
■If you still have a self-test failure, contact your network supplier.
The board has a physical interface to another serial device
and the following message is displayed:
Path 1 Available
Path 1B Available
Path 1C Available
but the next message is not displayed:
Path 1 Up
Path 1B Up
Path 1C Up
Incomplete path
■Make sure the cable is securely attached.
■If the cable is attached correctly and your paths are still not coming
up, make sure there is a complete data path and correct clocking
between both ends of the serial link. Check DSU/CSU and telco
connections.
The connection to a directly attached DTE device does not
come up. Misconfiguration
■If the paths do not come up, check that your software configuration
is correct, and make sure that the DTE-to-DCE configuration is correct
and consistent with the software configuration.
The STATUS LED is off when there is power to the system
and other installed modules are operating. Disabled module
■The module may not be properly connected to the NETBuilder II
backplane. Remove and reinsert the module.
■If it is still not working, replace the module.