Black Box Multiserver 500 User manual

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CUSTOMER
SUPPORT
INFORMATION
MARCH 1996
MX400A MX404C
MX401C MX406C
MX402C MX407C
MX403C MX410C
Multiserver 500
MULTISERVER 500
EXE
PO IS TD RD LS RS VA TM

FCC AND IC RFI STATEMENTS
FEDERAL COMMUNICATIONS COMMISSION
AND
CANADIAN DEPARTMENT OF COMMUNICATIONS
RADIO FREQUENCY INTERFERENCE STATEMENTS
This equipment generates, uses, and can radiate radio frequency energy and if not installed and used
properly, that is, in strict accordance with the manufacturer’s instructions, may cause interference to radio
communication. It has been tested and found to comply with the limits for a Class A computing device in
accordance with the specifications in Subpart J of Part 15 of FCC rules, which are designed to provide
reasonable protection against such interference when the equipment is operated in a commercial
environment. Operation of this equipment in a residential area is likely to cause interference, in which case
the user at his own expense will be required to take whatever measures may be necessary to correct the
interference.
Changes or modifications not expressly approved by the party responsible for compliance could void the
user’s authority to operate the equipment.
This digital apparatus does not exceed the Class A limits for radio noise emission from digital apparatus set out in the
Radio Interference Regulation of the Canadian Department of Communications.
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils
numériques de la classe A prescrites dans le Règlement sur le brouillage radioélectrique publié par le ministère des
Communications du Canada.

MULTISERVER 500
2
Trademarks
AT&T®is a registered trademark of American Telephone and Telegraph Company.
UL®is a registered trademark of Underwriters Laboratories Incorporated.

CONTENTS
3
Chapter 1: Specifications.......................................................................................................................................7
Chapter 2: Introduction .......................................................................................................................................10
2.1 Multiplexing and the Multiserver 500........................................................................................................10
2.2 Description of the Multiserver 500.............................................................................................................10
2.3 Block Diagram .............................................................................................................................................12
2.3.1 Voice/Fax Interface Module.........................................................................................................13
2.3.2 Digital Processing Module.............................................................................................................13
2.3.3 Serial Interface Module.................................................................................................................13
2.3.4 LCD ................................................................................................................................................13
2.3.5 Power Supply..................................................................................................................................13
2.4 Interfaces......................................................................................................................................................13
2.4.1 Data Channel .................................................................................................................................13
2.4.2 Voice/Fax Channel........................................................................................................................13
2.4.3 Composite Channel .......................................................................................................................13
2.4.4 Command Port...............................................................................................................................13
2.5 Options14
2.6 Modules Covered in This Manual ..............................................................................................................14
Chapter 3: Installation.........................................................................................................................................15
3.1 Unpacking the Multiserver 500 ..................................................................................................................15
3.2 Installing the Multiserver............................................................................................................................16
3.2.1 Selecting an Installation Site.........................................................................................................16
3.2.2 Cable and Power Connections ......................................................................................................16
3.3 Setting the Composite Transmit Clock ......................................................................................................17
3.4 Installing the Voice/Fax Interface Module ...............................................................................................18
3.5 Setting the Time and Date..........................................................................................................................19
Chapter 4: Using the LCD and Keypad..............................................................................................................21
Chapter 5: Using the Command Port.................................................................................................................28
5.1 Factory Defaults ...........................................................................................................................................28
5.2 Connecting Asynchronous Terminals ........................................................................................................30
5.2.1 Conecting a Single Multiserver 500..............................................................................................30
5.2.2 Connecting Multiple Multiserver 500s .........................................................................................31
5.3 Impedance Strapping..................................................................................................................................32
5.4 CMD IN and CMD OUT Connectors.........................................................................................................33
5.5 Accessing the Command Port.....................................................................................................................34
Chapter 6: Operation ..........................................................................................................................................41
6.1 LED Indicators.............................................................................................................................................41
6.2 The LCD and the Keypad ...........................................................................................................................43
6.3 Default Configuration Settings...................................................................................................................43
Contents

MULTISERVER 500
4
6.4 Operating the Multiserver 500 ...................................................................................................................44
6.4.1 Establish a Data Connection .........................................................................................................44
6.4.2 To Make a Telephone Call.............................................................................................................44
6.4.3 To Send a Fax Message ..................................................................................................................47
Chapter 7: Diagnostics and Troubleshooting ....................................................................................................48
7.1 Automatic Self-Test......................................................................................................................................48
7.2 User-Initiated Tests ......................................................................................................................................48
7.2.1 Suggested Test Sequence...............................................................................................................50
7.2.2 EEPROM Test.................................................................................................................................50
7.2.3 Self-Test...........................................................................................................................................50
7.2.4 Local Data Loopback Test .............................................................................................................50
7.2.5 Local Composite Loopback Test...................................................................................................51
7.2.6 Remote Composite Loopback Test...............................................................................................54
7.2.7 Remote Data Loopback .................................................................................................................57
Appendix A: FXS Voice/Fax Interface Module.................................................................................................58
A.1 Connectors on the Back Panel ...................................................................................................................59
A.2 Strapping......................................................................................................................................................61
A.3 Removing or Replacing the Module ..........................................................................................................61
A.4 Specifications ...............................................................................................................................................61
Appendix B: FXO Voice/Fax Interface Module................................................................................................63
B.1 Connectors on the Back Panel ...................................................................................................................64
B.2 Strapping......................................................................................................................................................66
B.3 Removing or Replacing the Module ..........................................................................................................67
B.4 Specifications ...............................................................................................................................................67
Appendix C: E&M Voice/Fax Interface Module...............................................................................................68
C.1 Differences Between Models.......................................................................................................................68
C.2 Telephone-Interface Connectors................................................................................................................69
C.3 Connecting the Telephone-Interface Cable ..............................................................................................69
C.4 E&M Lead States..........................................................................................................................................71
C.5 Connection Diagrams..................................................................................................................................71
C.6 Strapping......................................................................................................................................................75
C.7 Removing or Replacing the Module ..........................................................................................................76
C.8 Specifications ...............................................................................................................................................76
Appendix D: Changing the Data Interface Types..............................................................................................77
D.1 Removing the Top Cover ............................................................................................................................78
D.2 Configuring the Interfaces..........................................................................................................................78
D.3 Replacing the Top Cover.............................................................................................................................80
Appendix E: Agency and Telephone-Company Requirements ........................................................................82
E.1 Requirements for Operation with the Telephone Company....................................................................82
E.2 Equipment Attachment Limitations for Operation in Canada ................................................................82
Appendix F: Cabling and Pin Assignments........................................................................................................84
F.1 Cables for the Composite Interface ...........................................................................................................84
F.2 Data-Channel Interface Cables...................................................................................................................92

CONTENTS
5
Glossary .................................................................................................................................................................97
Index....................................................................................................................................................................102
Figures
2-1 Typical Multiserver 500 Application...........................................................................................................10
2-2 Multiserver 500, Front and Rear Views ......................................................................................................11
2-3 Multiserver 500 Block Diagram ..................................................................................................................12
3-1 Cable and Power Connectors......................................................................................................................16
3-2 Clocking with Multiserver 500 Connected to a DCE Device ....................................................................17
3-3 Installing or Removing the Voice/Fax Interface Module.........................................................................18
3-4 Setting the Time and Date..........................................................................................................................20
5-1 Reconfiguring the Command-Port Parameters .........................................................................................29
5-2 Connecting the Asynchronous Terminal ...................................................................................................30
5-3 Typical Three-Multiserver Daisychain Topology........................................................................................31
5-4 Setting the Data Rate and Device Number ................................................................................................31
5-5 Location of Command Port Impedance Header E5-on the Serial Interface Module ............................32
5-6 CMD IN CMD OUT Connector Pin Assignments (RS-422 Interface).....................................................33
5-7 Flowchart for Accessing the Command Port .............................................................................................34
6-1 The Front Panel of the Multiserver 500.....................................................................................................41
6-2 Telephone Calls from Local FXS Interfaces ..............................................................................................45
6-3 Telephone Calls from Local FXO or E&M Interfaces...............................................................................46
7-1 Clocking, with Multiserver 500s Connected in a Back-to-Back Hookup..................................................48
7-2 Tests in the Diagnostics Menu ....................................................................................................................49
7-3 Local Data Loopback Test...........................................................................................................................51
7-4 Local Composite Loopback Test.................................................................................................................52
7-5 FXO and E&M Voice/Fax Connections.....................................................................................................52
7-6 Setting Up a Remote Composite Loopback Test.......................................................................................55
7-7 Setting Up a Remote Data Loopback Test .................................................................................................56
A-1 A Typical FXS Application ..........................................................................................................................58
A-2 Connectors on the Back Panel of the FXS Interface Module ..................................................................59
A-3 Wiring of the Connectors on the Back Panel ............................................................................................59
A-4 Cable Connections ......................................................................................................................................60
B-1 A Typical FXO Application .........................................................................................................................63
B-2 Back Panel of the FXO Analog Interface Module.....................................................................................64
B-3 Wiring of the Connectors on the Back Panel ............................................................................................64
B-4 Cable Connections ......................................................................................................................................65
B-5 Locations of the Straps on the FXO Interface Module.............................................................................66
C-1 Connections for the E&M Voice/Fax Interface Module ..........................................................................68
C-2 Connectors on the Back Panel ...................................................................................................................69
C-3 Connecting the E&M Cable........................................................................................................................70
C-4 Type I Interface Connection.......................................................................................................................72
C-5 E&M Type II Interface Connection............................................................................................................73
C-6 E&M Type V Interface Connection Diagram.............................................................................................74
C-7 Where the Straps Are on the E&M Module...............................................................................................75
D-1 Removing the Top Cover ............................................................................................................................77
D-2 Configuring the Composite Interface........................................................................................................79
D-3 Configuring the Data-Channel Interface...................................................................................................81
F-1 Pin Assignments for the RS-232 COMPOSITE and DATA CHANNEL Connectors ...............................84

MULTISERVER 500
6
F-2 RS-232-to-RS-232 DCE Crossover Cable (EZ423-0015) .............................................................................85
F-3 Pin Assignments for the V.35 COMPOSITE and DATA CHANNEL Connectors....................................86
F-4 V.35-to-DCE Crossover Cable (EHN070-005M).........................................................................................87
F-5 Pin Assignments for the RS-530 COMPOSITE and DATA CHANNEL Connectors ...............................88
F-6 RS-530-to-RS-530 DCE Crossover Cable .....................................................................................................89
F-7 RS-530-to-RS-449 DCE Crossover Cable .....................................................................................................90
F-8 RS-530-to-X.21 DCE Crossover Cable.........................................................................................................91
F-9 RS-232-to-DTE Straight Cable (EDN16C-xxxx-MF) ..................................................................................92
F-10 V.35-to-DTE Straight Cable (EHN071-005M) ............................................................................................93
F-11 RS-530-to-RS-530 DTE Straight Cable ........................................................................................................94
F-12 RS-530-to-RS-449 DTE Straight Cable ........................................................................................................95
F-13 RS-530-to-X.21 DTE Straight Cable ............................................................................................................96
Tables
1-1 Allowable Rate Combinations.......................................................................................................................8
5-1 Impedance-Strapping Requirements .........................................................................................................32
6-1 LED Indicators.............................................................................................................................................42
C-1 E&M Lead States..........................................................................................................................................71
D-1 List of Configuration Items for the Composite Interface .........................................................................78
D-2 List of Configuration Items for the Data Channel Interface....................................................................80

CHAPTER 1: Specifications
7
Composite Interface
Type — RS-232 (CCITT V.24/V.28) serial
synchronous, internal/external clocking; full-
duplex interfaces to support optional V.35,
RS-530, RS-449, and X.21 standards
Connector — DB25 female
Configured as — DCE
Speeds (bps) — 7200, 9600, 14,400, 19,200,
38,400, 56,000, 64,000, 72,000
NOTE: The Multiserver 500 will not operate with
clock rates, internal or external, other than
those specified above.
Data-Channel Interface
Number of Channels — 1
Type — RS-232 (CCITT V.24/V.28) serial
synchronous/asynchronous, full-duplex
interfaces to support optional V.35, RS-530, RS-
449 and X.21 standards.
Connector — DB25 female connector
Configured as — DCE
Sync Channel Data Rates — 1200 bps to
72,000 bps
Sync-Channel Bandwidth Allocation — Fixed rate
or dynamic rate
Fixed Rate: Always operates at guaranteed rate
Dynamic Rate: Operates at either a maximum
configured rate or guaranteed configured rate,
depending on voice/fax activity and DBA
configuration
Dynamic Rate
Switching Status — On-hook/off-hook, or
idle/active voice/fax traffic
Maximum Rate — Composite rate minus
overhead
Async Channel
Data Rates — 1200 bps to 57,600 bps
Data Bits — 7 or 8 data bits plus 1 parity bit
Parity — Space, mark, even, odd, none
Stop Bits — 1, 1.5, and 2 per character
Flow Control — RTS/CTS and X-ON/X-OFF;
must be configured the same way at each end
EIA Controls: — 4 full-duplex control signals
supported
Voice/Fax Channel
Interface Types — E&M, FXS, or FXO, depending
on the type of voice/fax interface card installed
Digitizing Rates — Fixed rates of 4000, 4800,
6400, 7200, 8000, 9600, 12,000, 12,800, 14,400,
and 16,000. The voice/fax channel is
automatically assigned the highest fixed rate
within the available bandwidth. Available
bandwidth equals composite rate minus
guaranteed sync channel rate minus overhead.
Overhead is 400 bps for composite rates of less
than 56 Kbps, and 800 bps for composite rates
of 56 Kbps and above.
Specifications for Voice/Fax Modules — See
Appendixes A, B, and C
Command Port Interface
Type — RS-232 (CCITT V.24/V.28) serial
asynchronous
Connector — 8-position modular jack wired as RJ-
1D DCE
Speeds — 1200 bps to 19,200 bps
Data Bits — 7 or 8 data bits plus 1 parity bit
Parity — Space, mark, even, odd, none
1. Specifications

MULTISERVER 500
8
Stop Bits — 1, 1.5, and 2 per character
Flow Control — X-ON/X-OFF
Allowable Rate Combinations
Table 1-1 shows the allowable combinations of
composite and data channel rates.
Table 1-1. Allowable Rate Combinations
Composite Sync Data DBA Max Maximum
Rate Rate Sync Rate Async Rate
----------------------------------------------------------------------------
7200 1200 6800 3600
2400 6800
3600 6800
----------------------------------------------------------------------------
9600 1200 9200 4800
2400 9200
3600 9200
4800 9200
----------------------------------------------------------------------------
14400 1200 14400 9600
2400 14000
3600 14000
4800 14000
7200 14000
9600 14000
----------------------------------------------------------------------------
19200 1200 14000 14000
2400 14000
3600 19200
4800 19200
7200 19200
9600 19200
12000 19200
14400 19200
Composite Sync Data DBA Max Maximum
Rate Rate Sync Rate Async Rate
----------------------------------------------------------------------------
38400 1200 14400 28800
2400 14400
3600 19200
4800 19200
7200 19200
9600 19200
12000 28800
14400 28800
19200 33600
28800 38000
33600 38000
----------------------------------------------------------------------------
56000 1200 14400 38400
2400 14400
3600 19200
4800 19200
7200 19200
9600 19200
12000 28800
14400 28800
19200 33600
28800 38400
33600 48000
38400 55200
46400 55200
48000 55200
51200 55200

CHAPTER 1: Specifications
9
Composite Sync Data DBA Max Maximum
Rate Rate Sync Rate Async Rate
----------------------------------------------------------------------------
64000 1200 14400 38400
2400 14400
3600 19200
4800 19200
7200 19200
9600 19200
12000 28800
14400 28800
19200 33600
28800 38400
33600 48000
38400 56000
46400 56000
48000 63200
51200 63200
56000 63200
57600 63200
----------------------------------------------------------------------------
72000 1200 14400 38400
2400 14400 with 8-bit data
3600 19200
4800 19200
7200 19200
9600 19200 57600
12000 28800 with 7-bit data
14400 28800
19200 33600
28800 38400
33600 48000
38400 56000
46400 56000
48000 64000
51200 64000
56000 71200
57600 71200
64000 71200
Indicators — Self-test, EEPROM test, local and
remote data loopback tests, and local and
remote composite loopback tests
Power Requirements — 100-250 VAC, @ 0.9A, 50-
60Hz
Power Supply — External, provided with the
Multiserver
Size — 11.25″L ×8.5″W ×3″H (29 ×22 ×8 cm)
Weight — 3.4 lb. (1.5 kg)
Operating Environment —
Temperature: 32 to 114° F (0 to 45.5° C)
operating; -40 to 158° F (-40 to 70° C) storage
Relative Humidity: 25% to 75%
Atmospheric Pressure: 12.47 to 15.37 psi (86 KPA
to 106 KPA)
Agency Compliance
FCC Part 15, Class A
FCC Part 68
C.R.C., C. 13744
VDE 0871 Level B
CSA Standard C.22.2 No. 950 M-89
UL 1950
BABT 340, Issue 6
TÜV/GS-EN 60950/VDE 0805
DOC CS-03

MULTISERVER 500
10
2.1 Multiplexing and the Multiserver 500
The Multiserver 500 is a standalone voice/fax/data
multiplexor. It converts analog voice into low-bit-
rate digital format, and multiplexes the digitized
voice with data into a composite digital stream. The
composite stream is transmitted over a leased line
to a remote site.
At the remote site, another Multiserver 500
demultiplexes the composite stream into data and
digitized voice, and reconverts the digitized voice
into analog form.
It’s the low bit rates that allow voice signals to
share a leased line with data. When you add
digitized voice to an already existing data link, you
don’t pay anything more than your existing leasing
costs; the voice gets a free ride.
In addition to accepting analog voice signals for
digital conversion, the Multiserver 500 can also
process analog signals from a fax machine. When
the mux detects fax signals, the firmware switches
into fax mode. In this mode, signals are
demodulated into fax symbols and passed as data to
the remote end. At the remote end the symbols are
remodulated to the correct standards.
A typical Multiserver 500 application is shown in
Figure 2-1.
2.2 Description of the Multiserver 500
Physically, the Multiserver 500 is an assembly of
printed circuit boards—one data
channel/composite channel and one voice/fax
module—housed in a rectangular enclosure (see
Figure 2-2). The front of the unit includes an LED
display, an LCD display, and a keypad.
The LED display monitors power status, self-test
results, link conditions, and voice and data channel
activities.
The LCD display provides status, events, and
messages, and together with the keypad is used for
configuration, diagnostics, and administration
functions.
The physical ports for connecting the Multiserver
500 to the various interfaces are on the back of the
unit.
2. Introduction
Figure 2-1. Typical Multiserver 500 Application.
PBX
MAINFRAME
LOCAL
MULTISERVER 500
COMPOSITE
LINK
REMOTE
MULTISERVER 500
VOICE

CHAPTER 2: Introduction
11
MULTISERVER 500
EXE
PO IS TD RD LS RS VA TM
DC POWER CMD
PORT-IN
CMD
PORT-OUT COMPOSITE DATA CHANNEL
FXS
FXS
SG R T
Figure 2-2. Multiserver 500, Front and Rear Views.
LCD DISPLAY
KEYPAD
FRONT VIEW
REAR VIEW
LED INDICATORS

MULTISERVER 500
12
2.3 Block Diagram
Figure 2-3 is a diagram of the basic building blocks
that make up the Multiserver 500: the digital
processing module, the voice/fax interface module,
and the serial interface module. Attached to the
basic building blocks are the LCD display and
power-supply unit.
VOICE/FAX
VOICE/FAX
INTERFACE MODULE DIGITAL PROCESSING MODULE
LED
KEYPAD
LCD
RIBBON
CABLE
SERIAL INTERFACE
MODULE
DATA
COMPOSITE
COMMAND PORT
AC
POWER
POWER
SUPPLY
UNIT
Figure 2-3. Multiserver 500 Block Diagram.
-

CHAPTER 2: Introduction
13
2.3.1 VOICE/FAX INTERFACE MODULE
The main function of the voice/fax interface
module is to convert the analog signals from the fax
machine or telephone equipment into digital form,
so they can be used by the digital processing
module. In addition, the voice/fax interface
module supplies impedance matching and signaling
conversion between the analog interface and the
Multiserver 500.
2.3.2 DIGITAL PROCESSING MODULE
The digital processing module is the main
processing unit of the Multiserver 500. Its functions
include voice compression and multiplexing. In
addition, the LCD display and the keypad form part
of the digital processing module.
2.3.3 SERIAL INTERFACE MODULE
The serial interface module provides physical
connections for the data, composite, and Command
Port interfaces. It also contains the clock-
generating circuits derived either from internal or
external sources.
2.3.4 LCD
With the keypad, the LCD lets you configure and
monitor the Multiserver 500. It physically connects
to the digital processing module by a ribbon cable.
2.3.5 POWER SUPPLY
Power is supplied from a detachable power supply
through a connector at the back of the
Multiserver 500.
2.4 Interfaces
There are four interfaces that connect to the
Multiserver 500: data channel, voice/fax channel,
Command Port, and composite ichannel nterface.
2.4.1 DATA CHANNEL
The data channel interface is an RS-232 interface
terminated in a DB25 connector wired as DCE.
Support for V.35, RS-449/RS-530, and X.21 physical
levels is available on an optional basis, implemented
by daughterboards that plug into the serial
interface module.
The mux can accept both synchronous data
ranging from 1200 bps to 72,000 bps, and
asynchronous data ranging from 1200 bps to 57,600
bps.
2.4.2 VOICE/FAX CHANNEL
Depending on the type of telephone equipment (or
other analog equipment) interfacing with the
voice/fax channel, the voice/fax channel conforms
with one of three common types of signaling
conventions:
•FXS (Foreign Exchange Station)—Loop Start
•FXO (Foreign Exchange Office)—Loop Start
•E&M (E-lead and M-lead)—Tie Line Trunk
You can easily match the Multiserver 500 with the
correct telephone interface with a set of three
optional analog interface modules: FXS, FXO, and
E&M.
For more detailed information on the analog
interface modules, refer to Appendixes A, B, and C.
2.4.3 COMPOSITE CHANNEL
The composite is a synchronous channel ranging
from 7200 bps to 72,000 bps. Physically, the
composite channel is an RS-232 port terminated in
a DB25 connector wired as DCE. Support for V.35
RS-449/RS-530, and X.21 physical levels is also
available, implemented by daughterboards that
plug into the serial interface module.
2.4.4 COMMAND PORT
The Command Port is one way to access the
command facility of the Multiserver 500. Use the
command facility to issue commands and to
monitor status.
Physically, the Command Port is a set of two RJ-45
connectors at the back panel. It’s used to connect
an external asynchronous terminal to the
Multiserver 500.
In a single Multiserver 500 application, the CMD
PORT-IN connector is used for connection to the
terminal.
When several muxes are controlled by a single
terminal, the CMD PORT-IN connector connects to
the previous Multiserver 500 (or terminal, if it is the
first unit in line) and the CMD PORT-OUT
connector connects to the next Multiserver 500 in

MULTISERVER 500
14
line.
2.5 Options
As described earlier, the composite port and data
channel interface connectors are wired, as
standard, for interfacing with RS-232 type devices.
You can change the interface with a conversion kit.
See the next section for the part numbers.
For additional information, refer to Appendixes D
and F.
2.6 Models Covered in This Manual
The basic Multiserver 500 is part number MX400A-
232/232. You might also have ordered it in any of
the optional configurations:
MX400A-35/35: V.35 composite interface, V.35 data
interface
• Base unit (MX400A-232/232)
• Two MX410C-35 Interface Cards
MX400A-422/422: RS-422 (X.21) composite interface,
RS-422 (X.21) data interface
• Base unit (MX400A-232/232)
• Two MX410C-422 Interface Cards
MX400A-422/35: RS-422 (X.21) composite interface,
V.35 data interface
• Base unit (MX400A-232/232)
• MX410C-422 Interface Card
• MX410C-35 Interface Card
MX400A-35/232: V.35 composite interface, RS-232 data
interface
• Base unit (MX400A-232/232)
• MX410C-35 Interface Card
MX400A-422/232: RS-422 composite interface, RS-232
data interface
• Base unit (MX400A-232/232)
• MX410C-422 Interface Card
In addition to the Multiserver 500 (MX400), this
manual covers the following voice/fax interface
card models:
• MX401C: Standard E&M Interface Module
• MX402C: Enhanced E&M Interface Module
• MX403C: Standard FXO Interface Card
• MX404C: Enhanced FXO Interface Module
• MX406C: Standard FXS Interface Card
• MX407C: Enhanced FXS Interface Module

CHAPTER 3: Installation
15
Use the following procedures as a setup guide.
3.1 Unpacking the Multiserver 500
Unpack and inspect the equipment. Report any
physical damage to the shipping carrier. Save the
packing material. You may need it if you need to
return the unit for repair.
Check the contents of the equipment against the
packing slip. Verify that you have received the
following:
• The Multiserver 500
• If applicable, one modular cable for connecting
your FXS or FXO interface module to
telephone equipment
• One RJ-45-to-DB25 adapter
• One 8-conductor modular cable for use with the
adapter
• One power supply
Appendix F contains wiring diagrams for the above
cables. You may use them to construct your own
interface cables. Refer to Appendixes A, B, and C
for telephone interface cabling details.
3. Installation

MULTISERVER 500
16
3.2 Installing the Multiserver
3.2.1 SELECTING AN INSTALLATION SITE
You can place the unit on a tabletop or shelf large
enough to accommodate it. Allow enough space to
get to the cables easily and remove the cover, and
make sure there is unobstructed air flow from the
sides of the unit.
3.2.2 CABLE AND POWER CONNECTIONS
Figure 3-1 shows the rear panel of the
Multiserver 500.
1. Composite Interface
Use a crossover cable appropriate for your
installation. (See Section F.1 in Appendix F.)
Connect one end to the COMPOSITE connector
and the other end to the DCE device.
2. Data Channel Interface
Use a straight cable appropriate for your
installation. (See Section F.2.) Connect one end to
the DATA CHANNEL connector and the other end
to the DTE device.
3. Telephone Interface
Requirements vary with the type of telephone
equipment you’re connecting to—and with the type
of voice/fax interface module installed in the
Multiserver 500. Refer to Appendixes A through C
for details.
4. Power Connection
Connect the power supply output directly into the
DC POWER connector of the Multiserver 500.
Connect the other end to an AC wall outlet.
Figure 3-1 Cable and Power Connectors.
DC POWER CMD
PORT-IN
CMD
PORT-OUT COMPOSITE DATA CHANNEL
FXS
FXS
SG R T
ASYNCHRONOUS
TERMINAL
CONNECT TO
DCE DEVICE
CONNECT TO
DTE DEVICE

CHAPTER 3: Installation
17
WARNING!
Do not use any power supply other
than the one provided with your Multi-
server 500, as illustrated in Figure 3-1.
Any other power supply could damage
the Multiserver 500.
5. Connecting a Terminal to the Command Port
See Chapter 6 for information on setting up and
using your terminal.
3.3 Setting the Composite Transmit Clock
If your composite interface is connected to a DCE
device as in Figure 3-2, verify that the composite
clock is set to external. You can do that from the
LCD/keypad:
Main Menu
Configure Parameter
Composite Link
External Clock
NOTE: As shown in Figure 3-2, the Multiserver 500
provides transmit and receive clocks to the
synchronous data interface.
CAUTION!
Once a pair of Multiserver 500s,
configured for external clocking, have
established communications, the
clocking rate provided from the link
DCE device cannot be changed. If the
DCE rate is changed you must either
cycle the power off and on on the
Multiserver 500 or disconnect the link
cable and then reconnect.
You can use two Multiserver 500s as a diagnostics
tool. Simply connect two Multiserver 500s back to
back and bench-test them. To do this, set both
muxes to internal clock and select a composite
clock rate.
Once you’ve selected a composite clock rate, you
must set both the local and remote muxes to the
same rate. The procedure is as follows (see
Figure 3-3 ):
2. Set the clock rate (9600) of the local unit to
external:
>COM C=EX R=9600 <cr>
DATA SOURCE MULTISERVER 500 DCE DEVICE
RxC
RxD
TxD
TxC
Set for
External
Clock
RxC
RxD
TxD
TxC
Figure 3-2. Clocking with Multiserver 500 Connected to a DCE Device

DC POWER CMD
PORT-IN
CMD
PORT-OUT COMPOSITE DATA CHANNEL
FXS
FXS
SG R T
VOICE/FAX
INTERFACE MODULE
CAPTIVE
SCREW (2)
Figure 3-3. Installing or Removing the Voice/Fax Interface Module.
MULTISERVER 500
18
3. Save the clock rate:
>SA
4. At the remote unit, repeat steps 2 and 3.
NOTE: Both the local and the remote Multiserver
500s must be set to the same composite
clock rate. Otherwise, the system will lock
up.
3.4 Installing the Voice/Fax Interface Module
Normally, the Multiserver 500 is shipped with the
voice/fax interface module already installed. If it
was shipped separately, or if you need to change the
existing module, see Figure 3-3 and proceed as
follows:
Tool Required: Medium-sized flat-head screwdriver.
To install:
1. Facing the rear of the Multiserver 500, place the
voice/fax interface module in the card guides,
then slide it toward the rear until it is firmly
seated in its mating connector in the digital
module.

CHAPTER 3: Installation
19
2. Secure the module with the two spring-loaded
captive screws. For further information,
including cable installation, refer to Appendix
A, B, or C.
To remove:
1. Using a medium-sized flat-head screwdriver,
unscrew the two spring-loaded captive screws.
2. Grasp the interface module firmly and slide it
slowly toward you until it’s free of its mating
connector, then slide it out of the
Multiserver 500.
3.5 Setting the Time and Date
To set the time of day and date from the Command
Port terminal, enter:
>U T=hh:mm:ss (set)
>U D=dd/mm/yy (set)
Note that time and date are not stored in EEPROM
(non-volatile memory), and must be set again each
time the Multiserver is powered up.
See Chapter 6 for additional Command Port
details.
To set the time of day and date from the
LCD/keypad, follow the diagram in Figure 3-4.