Zultys MX250 User manual

MX250
Enterprise Media Exchange
Manual Part Number 90-18300
Hardware Manual
Zultys Technologies
771 Vaqueros Avenue
Sunnyvale, CA 94085
USA
tel: [phone]
fax: [phone]
http://www.zultys.com

Notice
The information contained in this document is subject to change without notice.
Zultys Technologies makes no warranty of any kind with regard to this material, including, but
not limited to, the implied warranties of merchantability and fitness for a particular purpose.
Zultys Technologies shall not be liable for errors contained herein or for incidental or consequential
damages in connection with the furnishing, performance, or use of this material.
Zultys Technologies assumes no responsibility for the use or reliability of interconnected
equipment that is not furnished by Zultys Technologies.
This document contains proprietary information which is protected by copyright. The contents of
this manual and the associated software are the property of Zultys Technologies, and all rights are
reserved. No part of this document may be photocopied, reproduced, stored in any computer
format, translated to another language, or publicly displayed without the prior written consent of
Zultys Technologies.
The information contained herein has been prepared by Zultys Technologies solely for use by
Zultys’ employees, agents, and customers. Dissemination or use of the information or concepts
contained herein to or by other parties is prohibited without prior written consent from Zultys
Te c h n o l o g i e s .
Zultys, the Zultys logo, and model names of Zultys products are trademarks of Zultys
Technologies and may be registered trademarks in certain countries. All other names may be
trademarks or registered trademarks of their respective owners.
Revision History
Release Release Date
0.1.1 06 May 2003
1.2.C 20 October 2003
1.2.N 26 December 2003
2.0.0 10 July 2004
2.2.1 16 December 2005
2.2.4 04 March 2005
2.2.5 05 May 2005
2.4.1 25 May 2005
2.4.3 29 July 2005

MX250 Hardware Manual i
Contents
Chapter 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Product Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.3 Documentation Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.4 Forms of Documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.5 Colophon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.6 Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.7 Documentation Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Chapter 2 Receiving the Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Shipment Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 In Case of Damage or Malfunction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4 Returning Items for Repair or Replacement . . . . . . . . . . . . . . . . . . . . . . . 9
Chapter 3 Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Front Side of MX250. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3 Rear Side of MX250. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.4 MX250 Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.5 Console Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Chapter 4 Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.2 Selecting a Site. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.3 Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.4 Electrostatic Discharge (ESD) Precautions . . . . . . . . . . . . . . . . . . . . . . . . 24
Chapter 5 Mounting the MX250 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.2 Equipment Rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.3 Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.4 Installing Brackets for Cable Management. . . . . . . . . . . . . . . . . . . . . . . . 26
5.5 Installing Mounting Brackets on Chassis . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.6 Installing the Chassis into the Equipment Rack . . . . . . . . . . . . . . . . . . . 29
Chapter 6 Connecting, Wiring, and Configuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.2 Installing Batteries for Real Time Clock . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.3 Setting the IP Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

ii MX250 Hardware Manual
Contents
6.4 Connecting the MX250 to the Networks . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.5 Configuring the MX250 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Chapter 7 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
7.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
7.2 During Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
7.3 Operational System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.4 Cluster LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.5 System Shut Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Chapter 8 Maintenance and Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.2 Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.3 Servicing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.4 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Appendix A Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Appendix B Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Appendix C Regulatory and Safety Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
C.1 Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
C.2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
C.3 Electromagnetic Compatibility (EMC) Emissions . . . . . . . . . . . . . . . . . . 53
C.4 Electromagnetic Compatibility (EMC) Immunity . . . . . . . . . . . . . . . . . . 54
C.5 Telecom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
C.6 FCC Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

1
Chapter 1
Introduction
1.1 Scope
1.1.1 Audience
This manual is intended for properly trained service personnel and technicians who need to
install an MX250 system. The manual assumes you are familiar with electronic circuitry and
wiring practices.
1.1.2 Installation and Use
1. Unpack the product and verify the items as described in chapter 2, starting on page 7.
2. Prepare the site as described in chapter 4, starting on page 21.
Warning The MX250 is designed to be installed by qualified personnel only. Installation by
unqualified individuals may result in injury and damage to the MX250 and
surrounding equipment.
Warning This equipment is to be installed and maintained by service personnel only as
defined by AS/NZS 3260 Clause 1.2.14.3 Service Personnel.
Warning The MX250 must be installed in a secure location that has access restricted to
qualified personnel only. Placing the MX250 in a location accessible by unqualified
individuals may result in bodily injury and damage to the MX250 and surrounding
equipment.
3. Install the MX250 as described in chapter 5, starting on page 25.
4. Install the battery and other accessories as described in the BPS12 Hardware Manual.

2
MX250 Hardware Manual
Warning Read and understand the installation instructions before you install the equipment
or connect it to its power source.
5. Tu r n o n t h e p o w e r.
6. Provision the system as described the MX Administrator’s Manual.
1.1.3 What this Manual Includes
This manual provides detailed information and instructions on the hardware and proper
installation of the MX250 enterprise media exchange. It provides ordering numbers and
descriptions for parts that are sold directly by Zultys.
The manual describes how you should receive the product, what you should do so if there is an
error, and how to obtain warranty and service.
1.1.4 What this Manual Does Not Include
This manual does not describe the features and functionality of the MX250, nor does it describe
how you should provision or use these products. The manual does not discuss technology details,
pricing, names of sales representatives, or names of distribution channels.
Access the Zultys web sites for all further information. Zultys is very open about its products and
most of the manuals are available on line at http://www.Zultys.com
1.2 Product Function
1.2.1 Interfaces
Figure 1-1 shows the available interfaces on the MX250.
No. of Ports Interface
2 10/100 Ethernet circuits for IP-enabled communication devices. No support for in-line
power.
2 FXS analog circuits to connect to telephones, fax machines, overhead pagers, door openers,
or other accessories. Both circuits operate as lifeline circuits in case of power failure to the
unit.
2 or 4
(optional)
T1 (1.544 Mb/s) or E1 (2.048 Mb/s) circuits any one of which can support voice (TDM) or
data.
4
(optional)
Basic Rate S/T circuits for connecting system devices to PSTN (CO)
8, 16, or 24
(optional)
FXO analog circuits to connect to the PSTN (CO)
8, 16, or 24
(optional)
FXS analog circuits to connect to telephones, fax machines, overhead pagers, door openers,
or other accessories.
1 3.5 mm audio input for music on hold
Figure 1-1 Available Interfaces on MX250

1. Introduction
3
1.2.2 Protocols
Figure 1-2 shows the supported protocols on the MX250.
1.3 Documentation Overview
1.3.1 Organization
This user’s manual describes:
•how to select a site for the MX250
•how to unpack the equipment
•how to mount the equipment in a rack
•how to wire the system to your LAN and to the service providers
1.3.2 Nomenclature
1.3.2.1 Acronyms
This manual often uses acronyms specific to the industry of telecommunications and data
communications. Because the sections (and, to a certain extent, the subsections) can be read in any
sequence, acronyms are not defined in the text. For a complete list of acronyms used in this
manual, see appendix A, starting on page 43.
1.3.2.2 Jargon
This manual often uses technical terms specific to the industry of telecommunications and data
communications. Very specialized terms are sparsely used, and their meanings are clearly
explained where they are used. For a complete definition of all unique terms used in this manual,
see the glossary in appendix B, starting on page 47.
Interface Supported Protocols
T1 (1.544 Mb/s) voice loop start, ground start, E&M wink start, E&M immediate
start, ISDN PRA (Nortel, Lucent, National, Japanese ISDN)
E1 (2.048 Mb/s) voice ETSI ISDN PRA, ETSI ISDN with overlap receiving
T1 (1.544 Mb/s) data PPP, Frame Relay
E1 (2.048 Mb/s) data PPP, Frame Relay
10/100 Ethernet circuits TCP/IP, Relative QoS, VLAN
FXS analog circuits loop start
FXO analog circuits loop start, ground start, Japanese DID
ISDN S/T Circuits ETSI ISDN BRA, DSS1, Japanese ISDN
Figure 1-2 Supported Protocols on MX250

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MX250 Hardware Manual
1.3.3 Special Paragraph Styles
The following are the notices that are used to attract special attention to certain items. They set
text off from the main body of the manual. These notices also appear in other languages where
required by certain regulatory bodies:
Important This notice contains special information that should not be ignored.
Caution This notice calls attention to a condition or procedure which, if not observed, could
result in damage to the MX250 or the loss of data.
Warning This notice indicates that if a specific procedure or practice is not correctly
followed, permanent damage to the MX250 and personal injury may result.
Danger This notice warns you of imminent hazard to yourself and others if proper
procedures are not followed.
1.4 Forms of Documentation
1.4.1 Printed
The printed version of this manual is updated as required.
1.4.2 PDF
This manual is available in PDF format. You can download the PDF file from the MX250 web site
at:
http://www.zultys.com
You can obtain old versions of the manual that may describe the hardware that you have, the
manual that was used to produce the most recently printed manual, or the latest manual that
describes all the latest features of the product. You can identify the version of the manual from
the title page, opposite the table of contents (page 2 of the PDF file).
When you use the PDF file, you can click on any reference in the text. This powerful feature
allows you to follow the references in the text very easily. Using Acrobat, you can then return to
the page you were previously reading. This is a huge benefit to you if you want to study a small
area of the product.
1.5 Colophon
This document was produced on personal computers using Adobe’s FrameMaker for Windows.
The printed book is printed by an offset process.

1. Introduction
5
The headings are set in Swiss 721, Bitstream’s version of the Helvetica™ typeface; the copy is set
in Zapf Calligraphic, Bitstream’s version of the Palatino™ typeface; notices are set in Swiss 721 or
News Gothic, Bitstream’s version of the Kingsley-ATF Type Corporation typeface. The drawings
were produced using Adobe Photoshop, Adobe Illustrator, and Microsoft Visio.
1.6 Related Documents
Figure 1-3 shows documents related to the use of the MX250.
1.7 Documentation Feedback
Zultys appreciates any constructive feedback on all our documentation. If you have comments or
error reports on any Zultys documentation, please submit your feedback to:
Technical Publications Department
Zultys Technologies
771 Vaqueros Avenue
Sunnyvale, California 94085 USA
[e-mail]
Description
MX Administrators Manual
Using the administration software for configuration and maintenance of the MX250
MXIE User’s Manual
Complete manual on the configuration and use of the client software for the MX250
MXIE User’s Guide
Quick reference on the use of the client software for the MX250
Voice Mail User’s Manual
Complete manual on the configuration and use of voice mail on the MX250
Voice Mail User’s Guide
Quick reference on the use of voice mail on the MX250
BPS12 Hardware Manual
Complete manual on the installation of the BPS12 Battery Power Supply
XRS12 Hardware Manual
Complete manual on the installation of the XRS12 Exchange Redundancy Switch
Figure 1-3 Related Documents for the MX250

6
MX250 Hardware Manual

7
Chapter 2
Receiving the Equipment
2.1 Initial Inspection
When the shipment of your MX250 system arrives, inspect the shipping boxes for external
damage, and record any discrepancies. Save the boxes and packing material in case you need to
ship the system to another facility. Always retain the packing materials if you suspect that part of
the shipment is damaged—the carrier may need to inspect them.
Warning Do not attempt to use the equipment if it appears damaged. Immediately report
the damage to Zultys or a local Zultys sales representative.
2.2 Shipment Contents
2.2.1 Unpacking Boxes
If the boxes have not been damaged in transit, unpack them carefully. Ensure that you do not
discard any accessories that may be packaged in the same box as the main unit. Take care when
handling the MX250.
Caution Do not drop or jolt the MX250. The hard disc inside the MX250 is designed for
continuous operation, but is fragile until installed. If you allow the MX250 to receive
a hard knock, you can cause irreversible damage to the hard disc.
2.2.2 Verify Content
Upon delivery of your system, inspect the packing list, and confirm that all items listed on that
note were received. You may not be able to verify delivery of firmware options until after you
install your system. Compare the packing slip with your purchase order.
Ensure that the accessories listed in figure 2-1 are present in the shipment.
Ensure that there are no discrepancies in the shipment and then prepare the site as described in
chapter 4, starting on page 21.

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MX250 Hardware Manual
Important If you suspect that there are discrepancies or that the equipment is not fully
functional, contact Zultys or your Zultys sales representative immediately.
Retain all packing materials and the shipping note for Zultys or its representative
to inspect. ZULTYS CANNOT BE HELD RESPONSIBLE IF YOU CLAIM THAT
AN ITEM IS MISSING, AND YOU HAVE NOT INFORMED ZULTYS WITHIN
THREE DAYS OF RECEIPT, OR IF YOU HAVE NOT RETAINED ALL PACKING
MATERIALS FOR INSPECTION.
2.2.3 Serial Numbers
Verify the serial numbers of each item and compare them with the serial numbers on the packing
lists. The serial number is a five digit alphanumeric code printed on a white barcode label. See
figure 3-2 to locate the serial number on the back of the MX250.
2.3 In Case of Damage or Malfunction
Notify your Zultys sales or service representative under any of the following conditions:
•the shipping container or any of the contents appear damaged
•an item is missing
•there is a discrepancy between the packing slip and the equipment received
•the equipment does not function correctly
Your supplier will arrange for repair or replacement, at Zultys’ discretion. In certain cases, Zultys
may require a claim settlement.
Qty Description
10 Screw, imperial, 12-24 x ½”, for mounting chassis to equipment rack.
10 Screw, metric, M6x10, for mounting chassis to equipment rack.
10 Screw, metric, M4x6, for fastening one bracket to the MX250.
10 Screw, metric, M4x10, for fastening two brackets to the MX250.
2 Mounting bracket, for mounting chassis to equipment rack.
2 Brackets for cable management
1 Spare fuse, 5x20mm, 6.3 A, 250 V, time lag type, for –48Vdc input
1 Compact disc containing software and documentation for the MX250
AC power cord for the MX250
Figure 2-1 Accessories for MX250 Base System

2. Receiving the Equipment
9
2.4 Returning Items for Repair or Replacement
2.4.1 Warranty Coverage
Zultys provides a warranty only through distribution channels. If you are an end user, consult the
reseller or distributor who has sold you the product for complete terms of the product that you
have purchased. Zultys requires that its distributors provide a standard warranty that is one year
in duration, and that complies with the local laws and expectations of the country in which you
reside.
Before returning merchandise for repair or replacement, you must ensure that the items are
under warranty. If you are unsure about the warranty of your merchandise, call your supplier or
a local Zultys sales representative for clarification. Contact your supplier for a return merchandise
authorization (RMA) number before returning any merchandise; this includes equipment
covered under warranty.
For merchandise not under warranty, you will be charged for a repair if the item is returned to
the factory. Call your supplier for pricing on an extended warranty for your merchandise.
2.4.2 Describing the Problem
If you are returning equipment for service, attach a tag or sheet of paper to the equipment giving
the following details:
•your company or institution’s name, address, and phone number
•the main person to contact, an alternative contact, and their phone numbers if different from
the main phone number
•the return shipping address and any special shipping instructions
•the model number and serial number of the equipment being returned
•a description of the failure (If failure is intermittent, describe its frequency and special
conditions that initiate the failure.)
•any additional comments
2.4.3 Accessories
Do not return any of the accessories with the equipment unless you suspect that it is faulty. If you
return an accessory, place a tag on it that clearly identifies it as yours, and briefly explain the
problem.
2.4.4 Packing
Wherever possible, use the original packing materials to ship the equipment. If these are not
available, containers and cushioning material similar to those originally used are available from
Zultys.
If it is inconvenient to obtain supplies from Zultys, use a strong, double-walled shipping carton.
Place about 70 mm (3 in) of cushioning material around all sides of the equipment.
Zultys is not responsible for any damage that occurs during shipment back to your supplier or to
the factory.

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MX250 Hardware Manual
2.4.5 Shipping
Obtain from your nearest Zultys sales or service representative the correct address to which you
should return the equipment. Clearly mark the container with Zultys’ address and your own
address. Ship the package prepaid and insured to Zultys.
The method of shipment which Zultys will return repaired merchandise back to your facility will
be the same method by which you shipped the merchandise to Zultys. For example, if you
shipped merchandise to Zultys by ground shipment, Zultys will return the merchandise to you
by ground shipment. If the merchandise must be repaired and returned to you as soon as
possible, you must arrange for the merchandise to be shipped to Zultys by overnight shipment.
2.4.6 Correspondence
In any correspondence subsequent to the return of equipment, always refer to the equipment by
model number, serial number, and the RMA number assigned.

11
Chapter 3
Hardware
3.1 Introduction
This chapter describes the MX250 hardware along with the telecommunications and data
communications interfaces.
3.2 Front Side of MX250
The front panel side of the MX250, as is shown in figure 3-1, has no wiring connectors. Chapter 7,
starting on page 37, describes the LED indicators.
The numbers in figure 3-1 correspond to the following components:
1. Power LED – During normal operation, the Power LED indicates the status of ac power and
battery applied to the MX250.
2. Load LED – During normal operation, the Load LED indicates system service accesses and
storage availability for applications, reports, and voice mail.
3. Status LED – During normal operation, the Status LED indicates the status of firmware
update, fan failure, temperature, console mode, and exceptions.
During system start up and shut down, the MX250 uses all LEDs to indicate procedure
completion. See Chapter 7, starting on page 37, for a description of MX250 LEDs.
Figure 3-1 Front Side of MX250

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MX250 Hardware Manual
3.3 Rear Side of MX250
The rear side of the MX250, as shown in figure 3-2, contains the power and communication
interface connectors.
The numbers in figure 3-2 correspond to the following components:
1. Fuse – Provides access to a 6 A, 5 x 20 mm, time lag fuse, which is in series with the –48V
battery. Replace this fuse only with a fuse of the same rating.
2. DC power input – When this input is connected to an external –48 Vdc battery supply, the
system remains powered when the ac supply is off. See section 4.3 on page 23.
Zultys recommends using the BPS12 as the external supply. Read the BPS12 Hardware
Manual for details on its installation and operation.
3. Reset button – When power to the MX250 is off, pressing this button will turn on the unit.
When power is on, pressing this button for one second initiates a system shut down.
4. IP address – An area to enter the configured IP address assigned to the MX250 with a label or
permanent marker.
5. Analog FXS – Two RJ11 connectors provide two analog FXS ports for connecting fax
machines, analog phones, or modems to the MX250. During a power failure on the MX250,
these circuits connect directly to the first two circuits on the FXO card of the first slot. See
section 3.4.2 on page 14.
6. 3.5 mm audio jacks – The port marked IN provides a 3.5 mm unbalanced input for music on
hold. The source can be stereo or mono with an output impedance of less than 120 Ωand a
level of 5 Vrms (as recommended by IEC 61938). The port marked OUT provides a 3.5 mm
output for connecting to an external speaker system such as an analog paging unit.
7. First Ethernet port – A 10/100Base-T circuit for connecting to any IP device, such as a LAN
switch, router, or IP phone. No in-line power is provided on this circuit. See section 3.4.1 on
page 13.
8. Second Ethernet port – A 10/100Base-T circuit for connecting to any IP device, such as a LAN
switch, router, or IP phone. No in-line power is provided on this circuit. See section 3.4.1 on
page 13. This circuit also serves as the console port as defined in section 3.5 on page 18.
Figure 3-2 Rear Side of MX250

3. Hardware
13
9. Console button – Pressing this button during boot up causes the Second Ethernet Port to
become the console port assigned the fixed IP address of 192.168.1.100. Read section 3.5 on
page 18 for instructions on using the console port.
10. Power LED – See section 3.2 and Chapter 7, starting on page 37, for a description of the Power
LED.
11. Load LED – See section 3.2 and Chapter 7, starting on page 37, for a description of the Load
LED.
12. Status LED – See section 3.2 and Chapter 7, starting on page 37, for a description of the Status
LED.
13. AC Input – Provides a universal fused input for ac power. You can insert 100 Vac to 240 Vac
at 47 Hz to 63 Hz. When the dc power input is connected to a –48 V battery, the system
remains powered when the ac power is off. See section 4.3 on page 23.
14. Hard Discs – Two slots which hold the SCSI hard disc drives. The MX250 requires one to
operate. The other serves as a redundant hard disk drive that is mirrored with the first one
in a RAID1 configuration. The system is shipped with one hard disc; a software license is
required to enable RAID1 redundancy of the second disc.
15. Serial Number – This number identifies the main chassis. Refer to this number to identify the
system to a technical support representative or when returning the system for repair or
replacement.
16. Interface slots – Each slot can accommodate one interface card for connection to the PSTN or
an ISP. There are four available types of interface cards:
•FXS: 8 analog subscriber-side circuits using loop start. See section 3.4.2.
•FXO: 8 analog exchange-side circuits using loop start or ground start. See section 3.4.2.
•PCM: 2 full-duplex PCM circuits which support T1 or E1 functionality. See section 3.4.3.
•BRA: 4 full-duplex ISDN BRA S/T circuits. See section 3.4.4.
17. Fan Tray – This removable tray contains two fans and the holder for two AAA batteries used
to power the system’s real time clock. See section 6.2 on page 31.
3.4 MX250 Circuits
The MX250 supports the following circuits:
3.4.1 10/100Base-T
3.4.1.1 Usage
The MX250 has two 10/100Base-T Ethernet circuits. Power over Ethernet is not provided on either
circuit.
•Circuit 1 connects to your LAN and provides data connectivity for the enterprise. You can
then use the MX250 firewall capabilities.
•Circuit 2 can be used as an additional circuit to connect to your LAN or as the console circuit
for initial provisioning, as described in section 3.5.

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MX250 Hardware Manual
3.4.1.2 RJ45 Pin Assignment
All 10/100Base-T Ethernet ports can be routed to a patch panel or to a punch down block for
fanning out to the proper destination. All ports use the RJ-45 connectors. Each circuit can
auto-detect CAT5 cable configuration (straight or crossover) and adapting accordingly.
Ethernet cable wiring must comply with EIA/TIA 568A for the CAT5 10/100Base-T Ethernet. Some
cable suppliers reference EIA/TIA 568A and others reference 568B. The difference is that the green
and orange pairs are terminated to different pins, however, the assignment of pin to signal are
exactly the same on both references. Crossover cables comply with EIA/TIA 568A in all aspects
except signals on pins 1 and 3 at one end appear on pins 2 and 6 at the other end.
Figure 3-8 shows the pin assignment on an RJ45 connector.
3.4.2 Analog Circuits
3.4.2.1 Usage
The MX250 supports up to three analog FXO or FXS cards through the interface slots. Each analog
card provides eight analog circuits. FXO circuits support Loop Start and Ground Start protocols;
FXS circuits support Loop Start. Analog circuit protocols are configured through the MX
Administrator software.
3.4.2.2 Analog RJ12 Pin Assignment
Two RJ12 ports on the MX250 connect analog subscriber circuits to the MX250. Figure 3-4 shows
the pin placement of the analog RJ12 connector. Figure 3-5 lists function of each pin.
Figure 3-3 Pin Placement of a 10/100 Ethernet Circuit
Figure 3-4 Pin Placement of the Analog Circuit RJ12 Connector

3. Hardware
15
3.4.2.3 Analog 50-Pin Telco Pin Assignment
The FXO and FXS interface boards have a 50-pin telco receptacle (female) for connecting analog
circuits to the MX250. Figure 3-6 shows the pin placement on the telco connector of the FXS and
FXO cards. Figure 3-7 shows the function assignment of each pin.
3.4.3 PCM (T1 and E1)
3.4.3.1 Usage
The MX250 supports up to two PCM cards through the interface slots. Each card has two
full-duplex circuits which can be configured for either T1 (1.544 Mb/s) or E1 (2.048 Mb/s). Each
circuit uses one of several supported PSTN or IP WAN protocols. The circuit type and protocol
for each circuit are configured through the MX Administrator software.
Pin Signal Name Abbreviation
1 (not connected) —
2 (not connected) —
3Ring1 R1
4Tip1 T1
5 (not connected) —
6 (not connected) —
Figure 3-5 Pin Description of the Analog RJ12 Connector
Figure 3-6 Pin Assignment of a 50-pin Telco Connector on FXO or FXS Card
Pin Signal Name Abbreviation
1 to 8 Tips for circuit 1 to 8 T1 to T8
26 to 33 Ring for circuit 1 to 8 R1 to R8
9 to 25 Unconnected
34 to 50 Unconnected
Figure 3-7 Pin Description of 50-pin Telco Connector

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MX250 Hardware Manual
3.4.3.2 PCM RJ45 Pin Assignments
Each circuit on the PCM card terminates on an RJ45 connector. Figure 3-8 shows the pin
placement of each pin of the PCM. Both circuits have the same pin assignment. Figure 3-9 shows
the function assignment of each pin.
Figure 3-10 displays the connection of PCM circuits to the network or other equipment. Use a
straight cable to connect the MX250 to the network jack. Use a crossover cable to connect the
MX250 to an existing terminal system (such as an existing PBX). Figure 3-10 also displays MX250
pinouts and pinouts typically used for terminal and network equipment. Consult the
documentation for specific devices to confirm the pin assignment.
Figure 3-8 Pin Assignment of PCM Circuits on PCM Card
Pin Signal Name Circuit Source
3NC AA common
6NC AA common
7NC AA common
8NC AA common
1 Received Data, ring BAa Facility
2 Received Data, tip BAb Facility
4 Transmitted Data, ring BBa MX250
5 Transmitted Data, tip BBb MX250
Figure 3-9 Pin Description of a PCM Circuit
Figure 3-10 Wiring the PCM Circuits to the Network or Other Equipment