Interlogix MC251-4P/1S User manual

IFS MC251-4P/1S and
NS2051-4P/1T User Manual
P/N 1072572 • REV 00.06 • ISS 30JAN13

ii IFS MC251-4P/1S and NS2051-4P/1T User Manual
Copyright © 2013 UTC Fire & Security Americas Corporation, Inc.
Interlogix is part of UTC Climate Controls & Security, a unit of
United Technologies Corporation. All rights reserved.
Trademarks and
patents The IFS MC251-4P/1S and NS2051-4P/1T and logo are
trademarks of United Technologies.
Other trade names used in this document may be trademarks or
registered trademarks of the manufacturers or vendors of the
respective products.
Intended use Use this product only for the purpose it was designed for; refer to
the data sheet and user documentation for details. For the latest
product information, contact your local supplier or visit us online
at www.interlogix.com.
Manufacture
r
UTC Fire & Security Americas Corporation, Inc.
2955 Red Hill Avenue
Costa Mesa, CA 92626-5923, USA
EU authorized manufacturing representative:
UTC Fire & Security B.V., Kelvinstraat 7,
6003 DH Weert, The Netherlands
Certification N4131
FCC compliance This equipment has been tested and found to comply with the
limits for a Class A digital device, pursuant to part 15 of the FCC
Rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is
operated in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy and, if
not installed and used in accordance with the instruction manual,
may cause harmful interference to radio communications.
You are cautioned that any changes or modifications not
expressly approved by the party responsible for compliance
could void the user's authority to operate the equipment.
ACMA compliance Notice! This is a Class A product. In a domestic environment
this product may cause radio interference in which case the user
may be required to take adequate measures.
Canada This Class A digital apparatus complies with Canadian ICES-
003.Cet appareil numérique de la classe A est conforme á la
norme NMB-003du Canada.
European Union
directives 2004/108/EC (EMC Directive): Hereby, UTC Fire & Security
Americas Corporation, Inc. declares that this device is in
compliance with the essential requirements and other relevant
provisions of Directive 2004/108/EC.
2002/96/EC (WEEE directive): Products marked with this
symbol cannot be disposed of as unsorted municipal waste in
the European Union. For proper recycling, return this product to
your local supplier upon the purchase of equivalent new
equipment, or dispose of it at designated collection points. For
more information see: www.recyclethis.info.
Contact information For contact information see our Web site: www.interlogix.com.
Contact support www.interlogix.com/customer support

IFS MC251-4P/1S and NS2051-4P/1T User Manual iii
Contents
Overview 1
Package Contents 1
Product Features 2
Installation 4
Product Description 4
Front Panel 5
LED Indicators 6
Top Panel 7
Wiring the Power Inputs 7
Wiring the Fault Alarm Contact 8
Mounting Installation 9
Application 13
Installation Steps 13
Switch Operation 14
Troubleshooting 17
Specifications 18
RJ45 Pin Assignments 21
Contacting Technical Support 23

IFS MC251-4P/1S and NS2051-4P/1T User Manual 1
Overview
The MC251-4P/1S Industrial 802.3af Power over Ethernet
Media converter, and NS2051-4P/1T 802.3af PoE switch that
fully complies with the IEEE 802.3 10Base-TX and IEEE
802.3u 100Base-TX standards. The MC251-4P/1S and the
NS2051-4P/1T Industrial 802.3af Power over Ethernet Media
converters also supports IEEE 802.3x flow control and back
pressure standard in half-duplex to eliminate packet loss.
Package Contents
Check the contents of your package for the following parts:
• Industrial Ethernet Module x1
• User’s Manual x1
• DIN Rail Kit x 1
• Wall Mount Kit x 1
If any of these items are missing or damaged, please contact
your distributor or IFS sales rep. If possible, retain the original
carton and packaging material in case you need to return the
product for repair/replacement.

2 IFS MC251-4P/1S and NS2051-4P/1T User Manual
Product Features
Physical Port
Ports Fiber Optical Interface
Model Name Copper Optical Mode Connector Distance
NS2051-4P/1T 5 x
10/100Base-
TX
NA NA NA NA
MC251-4P/1S 4x 10/100Base-
TX
1 x
100Base-
FX
Depends on
SFP
Module
Depends
on SFP
Module
Depends
on SFP
Module
IEEE 802.3af PoE
Complies with IEEE 802.3af Power over Ethernet
End-Span PSE
Up to 4 IEEE 802.3af devices powered
Supports PoE Power up to 15.4 Watts for each PoE
port
Auto detect powered device (PD)
Circuit protection prevent power interference between
ports
Remote power feeding up to 100m
Layer 2 Features
Complies with IEEE 802.3 10Base-T, IEEE 802.3u
100Base-TX / 100Base-FX Ethernet standard
Supports Auto-Negotiation,10/100Mbps Half / Full
Duplex and Auto MDI/MDI-X
High performance Store and Forward architecture,
Runt/CRC filtering eliminates erroneous packets to
optimize the network bandwidth
Prevents packet loss with Back Pressure (Half-
Duplex) and IEEE 802.3x PAUSE Frame Flow
Control (Full-Duplex)
Backplane (Switching Fabric): 1Gbps
Automatic address learning and address aging
Integrated address look-up engine, supports 2K
absolute MAC addresses

IFS MC251-4P/1S and NS2051-4P/1T User Manual 3
CSMA/CD Protocol
Industrial Case / Installation
IP-30 Aluminum Metal case / Protection
DIN Rail and Wall Mount Design
Redundant Power Design: 24 or 48V DC, redundant
power with polarity reverse protect function
Supports EFT protection 6000V DC for power line
Supports 6000V DC Ethernet ESD protection
-40 to 75 Degree C operating temperature

4 IFS MC251-4P/1S and NS2051-4P/1T User Manual
Installation
This section describes the functionalities of the Industrial Fast
Ethernet components and guides how to install it on the
desktop. Basic knowledge of networking is assumed. Please
read this chapter completely before installation.
In the following section, the term “Industrial Fast Ethernet
Switch” means the MC251-4P/1S and the NS2051-4P/1T
Product Description
The IFS MC251-4P/1S and the NS2051-4P/1T are 5-Port
10/100Mbps with 4-Port PoE unmanaged Industrial Fast
Ethernet Switches and provide non-blocking wire-speed
performance in an IP-30 aluminum metal enclosure for easy
deployment in harsh Industrial demanding environments.
The PoE in-line power follow the standard IEEE 802.3af and
allows to power 4 PoE compliant devices at distance of up to
100 meters through the 4-pair Cat 5 / 5e UTP wire. With Data
and Power over Ethernet from one unit, the MC251-4P/1S
and the NS2051-4P/1T reduces cable deployment and
eliminates the need for dedicated electrical outlets on the wall,
ceiling or any hard to reach locations.
With 1Gbps internal switching fabric, the Industrial Fast
Ethernet Switch can handle large amounts of data in a secure
topology linking to a backbone or high capacity servers.
The Industrial Fast Ethernet Switch has a 2K MAC address
table and offers wire-speed packets transfer performance
without risk of packet loss. The stable throughput of the device
makes it ideal for most Ethernet environments.
All RJ-45 copper interfaces support 10/100Mbps Auto-
negotiation for optimal speed detection through RJ-45
Category 3, 4, 5, 5e or 6 cables. Support standard for Auto-
MDI/MDI-X that can detect the type of connection to any

IFS MC251-4P/1S and NS2051-4P/1T User Manual 5
Ethernet device without requiring special straight or crossover
cables.
The Flow Control function allows Industrial Fast Ethernet
Switch supported routers and servers to directly connect to
this device for fast, reliable data transfer.
Front Panel
The figure below shows the front panel of the MC251-4P/1S
and the NS2051-4P/1T.

6 IFS MC251-4P/1S and NS2051-4P/1T User Manual
LED Indicators
System
LED Color Function
P1 Green Indicates that power 1 is on.
P2 Green Indicates that power 2 is on.
Fault Green Indicates either power 1 or power 2 has no power.
Per 10/100Base-TX Port
LED Color Function
Light Indicates that the link through that port is
successfully established at 100Mbps.
Link /
ACT Green Blink Indicates that the Switch is actively sending
or receiving data over that port.
Per 100Base-FX Port
LED Color Function
Light Indicates that the link through that port is
successfully established at 10 or 100Mbps.
Link /
ACT Green Blink Indicates that the Switch is actively sending
or receiving data over that port.
PoE Port
LED Color Function
PoE In
Use Orange Indicates that the port is providing 48V DC in-line power. (Ports 1-4)

IFS MC251-4P/1S and NS2051-4P/1T User Manual 7
Top Panel
The top panel of the MC251-4P/1S and the NS2051-4P/1T
consists of one terminal block connector with two DC power
inputs.
Wiring the Power Inputs
The 6-contact terminal block connector on the top panel of the
MC251-4P/1S and the NS2051-4P/1T is used for two DC
redundant powers inputs. Please follow the steps below to
insert the power wires.
1. Insert positive / negative DC power wires into the contacts
1 and 2 for POWER 1, or 5 and 6 for POWER 2.
V1-V1+ V2- V2+
2. Tighten the wire-clamp screws to prevent the wires from
disconnecting.

8 IFS MC251-4P/1S and NS2051-4P/1T User Manual
1 2 3 4 5 6
Power 1 Fault Power 2
- + - +
Wiring the Fault Alarm Contact
The fault alarm contacts are in the middle of the terminal block
connector as the picture shows below. Inserting the wires, the
MC251-4P/1S and the NS2051-4P/1T will detect the fault
status of the power failure and then forms an open circuit. The
following illustration shows an application example for wiring
the fault alarm contacts.
1 2 3 4 5 6
Insert the wires into the fault alarm contacts

IFS MC251-4P/1S and NS2051-4P/1T User Manual 9
Note: The wire gauge for the terminal block should be in the
range between 12 ~ 24 AWG.
The alarm relay circuit accepts up to 30V, max. 3A currents.
Mounting Installation
This section describes how to mount the MC251-4P/1S and
the NS2051-4P/1T and make connections to it. Please read
the following sections and perform the procedures in the order
presented.
Note: In the installation steps below, this Manual uses the IFS
GE-DSGH-8 Industrial Gigabit Switch as an example.
However, the steps for any IFS Industrial Switch & Industrial
Media Converters are similar.
Mounting to a DIN-Rail
The DIN-Rail kit comes assembled on the MC251-4P/1S and
the NS2051-4P/1T out of the box. Please refer to following
figures to hang the MC251-4P/1S and the NS2051-4P/1T on a
DIN-Rail.

10 IFS MC251-4P/1S and NS2051-4P/1T User Manual
1. Lightly press down and push the bottom of the DIN-Rail
connector mount into the track.
2. Check that the DIN-Rail connector mount is tightly mounted
on the track.
3. Please refer to following procedures to remove the MC251-
4P/1S and the NS2051-4P/1T from the track.

IFS MC251-4P/1S and NS2051-4P/1T User Manual 11
4. Lightly press down and pull the bottom of DIN-Rail
connector mount to remove it from the track.
Mounting to a Wall
To install the MC251-4P/1S and the NS2051-4P/1T on the
wall, please follows the instructions described below.
1. Loosen the screws to remove the DIN Rail from the Media
Converter.

12 IFS MC251-4P/1S and NS2051-4P/1T User Manual
2. Place the wall mount plate on the rear panel of the MC251-
4P/1S and the NS2051-4P/1T.
3. Assemble the wall mount plate on the MC251-4P/1S and
the NS2051-4P/1T.
4. Use the hook holes at the corners of the wall mount plate
to hang the MC251-4P/1S and the NS2051-4P/1T on the wall.

IFS MC251-4P/1S and NS2051-4P/1T User Manual 13
Application
In this section installation details of industrial fast ethernet
swtiches will be described.
Providing up to 4 PoE, in-line power interfaces, the Industrial
Fast Ethernet Switch can easily power a central-controlled IP
phone system, IP camera system, or AP group for the
enterprise.
Installation Steps
Step 1: Unpack the Industrial Fast Ethernet Switch.
Step 2: Check the DIN-Rail that is pre-installed on the
Industrial Fast Ethernet Switch. (Please refer to DIN-Rail
Mounting section for DIN-Rail installation. If you want to wall

14 IFS MC251-4P/1S and NS2051-4P/1T User Manual
mount the Industrial Fast Ethernet Switch, then please refer to
Wall Mount Plate Mounting section for specific instructions.
Step 3: To hang the Industrial Fast Ethernet Switch on the
DIN-Rail track or wall, please refer to the Mounting Installation
section.
Step 4: Power on the Industrial Fast Ethernet Switch. (Please
refer to the Wiring the Power Inputs section for power input)
The power LED on the Industrial Fast Ethernet Switch will
illuminate. Please refer to the LED Indicators section for
meaning of LED lights.
Step 5: Prepare the twisted-pair, straight through Category 5
cable for Ethernet connection.
Step 6: Insert one side of Category 5 cables into the Industrial
Fast Ethernet Switch Ethernet port (RJ-45 port) and the other
side to the network device Ethernet port (RJ-45 port), ex:
Switch, PC or Server. The UTP port (RJ-45) LED on the
Industrial Fast Ethernet Switch will light up when the cable is
connected to the network device. Please refer to the LED
Indicators section for LED light meaning.
Step 7: Insert fiber cable from the MC251-4P/1S to the fiber
network. TX, RX must be paired at both ends. The optical port
LED on the MC251-4P/1S will illuminate when the connection
is established with network device. Please refer to the LED
Indicators section for LED light meaning.
Step 8: When all connections are set up and the LEDs
illuminate, the installation is completed.
Switch Operation
Address Table
The Industrial Fast Ethernet Switch is implemented with an
address table. This address table is composed of many
entries. Each entry is used to store the address information of

IFS MC251-4P/1S and NS2051-4P/1T User Manual 15
each node in the network, including MAC address, Port No.,
etc. This information comes from the learning process of the
Industrial Fast Ethernet Switch.
Learning
When one packet comes from any port of the Industrial Fast
Ethernet switch, the Industrial Fast Ethernet Switch will record
the source address, port no. and other related information in
the address table. This information will be used to decide
either forwarding or filtering for future packets.
Forwarding & Filtering
When one packet comes from another port of the Industrial
Fast Ethernet Switch, it will also check the destination address
besides the source address learning. The Industrial Fast
Ethernet Switch will lookup the address-table for the
destination address. If not found, this packet will be forwarded
to all the other ports except the port which this packet came in.
And these ports will transmit this packet to the network it's
connected to. If found, and the destination address is located
at a different port from this packet comes in, the Industrial Fast
Ethernet Switch will forward this packet to the port where this
destination address is located according to the information
from address table. But, if the destination address is located at
the same port with this packet comes in, then this packet will
be filtered.
Store-and-Forward
Store-and-Forward is one type of packet-forwarding
techniques. A Store-and-Forward Industrial Switch stores the
incoming frames in an internal buffer and checks for any errors
from the frames before transmission. Lack of error packet
occurrence is important for an efficient and stable network..

16 IFS MC251-4P/1S and NS2051-4P/1T User Manual
The Industrial Fast Ethernet Switch scans the destination
address from the packet-header, searches the routing table
provided for the incoming port and forwards the packet, only if
required. The fast forwarding makes the switch attractive for
connecting servers directly to the network, thereby increasing
throughput and availability. However, the switch is most
commonly used to segment existing hubs, which nearly always
improves overall performance. Ethernet Switching can be
easily configured in any Ethernet network environment to
significantly boost bandwidth using conventional cabling and
adapters.
Due to the learning function of the Industrial Fast Ethernet
Switch, the source address and corresponding port number of
each incoming and outgoing packet are stored in a routing
table. This information is subsequently used to filter packets
whose destination address is on the same segment as the
source address. This confines network traffic to its respective
domain, reducing the overall load on the network.
The Industrial Fast Ethernet Switch performs "Store-and-
Forward" therefore, no error packets occur. More reliably, it
reduces the re-transmission rate. No packet loss will occur.
Auto-negotiation
The TP ports on the Industrial Fast Ethernet Switch have built-
in “Auto-negotiation”. This technology automatically sets the
best possible bandwidth when a connection is established with
another network device (usually at Power On or Reset). This is
done by detecting the modes and speeds at the moment both
devices are connected.