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PXES4P Switches 

 Installation and User Guide (10/06)  

 
 20 

2.4  Frame Buffering and Latency 

 

The  PXES4P Series Switches are store-and-forward switches.  Each frame (or 

packet) is loaded into the Switch’s memory and inspected before forwarding can occur.  

This technique ensures that all forwarded frames are of a valid length and have the correct 

CRC, i.e., are good packets.  This eliminates the propagation of bad packets, enabling all of 

the available bandwidth to be used for valid information.  

 

While other switching technologies such as "cut-through" or "express" impose 

minimal frame latency, they will also permit bad frames to propagate out to the Ethernet 

segments connected.  This "cut-through" technique permits collision fragment frames, 

which are a result of late collisions, to be forwarded which add to the network traffic.  

Since there is no way to filter frames with a bad CRC (the frame must be present in order 

for CRC to be calculated), the result of indiscriminate cut-through forwarding is greater 

traffic congestion, especially at peak activity.  Since collisions and bad packets are more 

Summary of Contents for Power Xpert PXES4P Series

Page 1: ...Headquarters Eaton Electrical Inc 1000 Cherrington Parkway Moon Township PA 15108 Phone 1 800 525 2000 Website http www eatonelectrical com Power Xpert Ethernet Switch PXES4P Series Installation and U...

Page 2: ...Important The PXES4P 10 100 Mb s Convenient Switches contain no user serviceable parts Attempted service by unauthorized personnel shall render all warranties null and void If problems are experience...

Page 3: ...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 desig...

Page 4: ...XES4P Switches Installation and User Guide 10 06 3 Contacting EATON EATON ELECTRICAL INC For Technical Support please call 800 809 2772 Or 414 449 7100 Or visit our Website http www eatonelectrical co...

Page 5: ...uct Description 16 2 3 PXES4P Series with four RJ 45 Copper ports 18 2 4 Frame Buffering and Latency 20 2 5 Features and Benefits 22 2 6 Applications 24 For PXES4P Series 24 3 0 INSTALLATION 26 3 1 Lo...

Page 6: ...NICs which support Auto Negotiation RJ 45 ports 37 4 0 OPERATION 38 4 1 Dual Speed Functionality and Switching The PXES4P Series Switches provide four switched ports three ports in the front and one o...

Page 7: ...PXES4P Switches Installation and User Guide 10 06 6 5 3 Return Material Authorization RMA Procedure 46 5 4 Shipping and Packaging Information 47 Appendix A Warranty Information...

Page 8: ...0Mbps When a port is operating at 10 Mbps Data Rate 10 Mbps Network Standards 100Mb Ethernet IEEE 802 3u 100BASE TX IEEE 802 1p 10 Mb Ethernet IEEE 802 3 10BASE T Power Over Ethernet IEEE 802 3af PPXE...

Page 9: ...g Auto learning 2K address table Address buffer age out time 300 sec Packet buffers memory 128KB dynamically shared on all domains Non blocking switching Latency not including packet time 100 to 10 Mb...

Page 10: ...ude 200 to 5000ft 60 15 000 m Conformal Coating optional Humidity protection Note This model is designed for NEBS compliance including vibration shock and altitude Packaging Enclosure Robust sheet met...

Page 11: ...urrent i e 100mA to 500mA When connected to a 48 V centralized dc source these products shall be provided with a Listed 5 A DC fuse in the supply circuit UL listed class II Power Supply AC External Po...

Page 12: ...Out put 12vdc 2 Amps DC to unit 12V DC 2 5mm jack center ve 6ft cord Power Supply Direct DC built in screw terminal block for ground The 12V DC jack is also present 12V DC internal range of 8 0 to 15V...

Page 13: ...RJ 45 ports provided in front and one on the rear Supports shielded STP and unshielded UTP Cat 3 4 5 cable LED Indicators Dual front and end port 4 has front only POWER Steady ON when power applied PX...

Page 14: ...ine Between Failure MTBF 15 years Telcordia Bellcore SR 332 Method Agency Approvals and Standard Compliance UL Listed UL 60950 cUL CE Emissions meet FCC Part 15 Class A NEBS L3 and ETSI compliant IEEE...

Page 15: ...12VDC Same as PXES4P model except Ext AC Hardened power supply not included PXES4P24C Same as PXES4P 12VDC model except for 24VDC power input PXES4PR 24VDC Same as PXES4P 24VDC model but includes PXE...

Page 16: ...nts of this package for any signs of damage and ensure that the items listed below are included This package should contain 1 PXES4P Series Switch Unit 1 External Power Supply d i model only 1 set Met...

Page 17: ...ner Refer to Section 5 Troubleshooting for specific return procedures 2 2 Product Description The PXES4P family of Switches is loaded with heavy duty industrial features Input power may be AC or DC at...

Page 18: ...is also used as a heat sink No air inflow is required for cooling so the PXES4P resists dust dirt moisture smoke and insects and is above the ceiling plenum rated Choices of models for external AC or...

Page 19: ...view one RJ 45 port and DC option on left side as shown in Fig c 8 15V DC PXES4P left side view ES4P Side View 2 3 PXES4P Series with four RJ 45 Copper ports The PXES4P Series chassis house one main P...

Page 20: ...direction There are power PWR indicators for the unit to validate that the unit is turned ON For each port there are Link and Activity LK ACT LEDs indicating traffic that are mounted on the top of the...

Page 21: ...andwidth to be used for valid information While other switching technologies such as cut through or express impose minimal frame latency they will also permit bad frames to propagate out to the Ethern...

Page 22: ...temporarily stop sending traffic which allows a traffic catch up to occur without dropping packets Then normal packet buffering and processing resumes This flow control sequence occurs in a small frac...

Page 23: ...100Mb or 100Mb to 10 Mb forwarding the latency is 15 microseconds plus the packet time at 10 Mb For 100Mb to 100Mb forwarding the latency is 5 microseconds plus the packet time at 100Mb 2 5 Features a...

Page 24: ...tatus information when viewed at any angle or mounting arrangement rack mount DIN Rail or panel mount Rugged metal case Industrial grade PXES4P Series are packaged in rugged sheet metal enclosures to...

Page 25: ...he factory floor Efficient Compact design for all purpose convenient mounting Featuring a compact metal case PXES4P Series can be installed in minimal space in a rack mount PXESTRAY on DIN Rail option...

Page 26: ...twork PLC PLC PLC PLC PLC Laptop computer IBM Compatible IBM Compatible IBM Compatible Workstation Workstation IBM Compatible Workstation PXES4P Switches provided a secure economical solution for expa...

Page 27: ...ically used where 10 100BASE T networking equipment is being installed in highly controlled temp environments and require an effective and economical solution to satisfy the need 3 0 INSTALLATION This...

Page 28: ...available Secure attachment of mounting clips for Panel Installation of the PXES4P Series Switches is a simple procedure The installation location is dependent upon the physical layout of the Ethernet...

Page 29: ...along with Media Converter units are mounted with their RJ 45 ports and DC power jacks in the back with either fiber or BNC cable in the front Any mix of the Convenient Switches Media Converters may b...

Page 30: ...e together 3 4 DIN Rail mounting option PXES4P Switches designed for use in Factory Floor Industrial Ethernet environments are also available for DIN Rail mounting in an enclosure having DIN Rails The...

Page 31: ...require a nominal 12VDC input range 8 to 15V see Specifications at the jack in the rear The extended temperature Hd version is used for heavy duty and industrial applications up to 55 C ambient The 1...

Page 32: ...The 9V DC jack is also present Detail information about the 12 VDC the 24V DC and the 48V DC is provided in the Technical Specifications Section 1 1 The various models of Direct DC power type and ext...

Page 33: ...power leads Three models support a range of power input types The three model choices are for use with 12VDC 24VDC or 48VDC power DC power input may be chosen for high availability DC Power Terminals...

Page 34: ...ds or 24VDC 12VDC leads to the Direct DC power terminal block on the PXES4P hardened media converter as shown in Figure above The DC terminal block on the PXES4P is located on the left side of the uni...

Page 35: ...l it connects to the PXES4PH chassis Ensure that each lead is securely tightened from the top as shown here NOTE Always use a voltmeter to measure the voltage of the incoming power supply and figure o...

Page 36: ...se the maximum distance for unshielded twisted pair cabling is 100 meters 328 ft Media IEEE Standard Connector Twisted Pair CAT 3 or 5 10BASE T RJ 45 Twisted Pair CAT 5 100BASE TX RJ 45 NOTE It is rec...

Page 37: ...nector of the port Note that even though the connector is shielded either unshielded or shielded cables and wiring may be used 2 Connect the other end of the cable to the corresponding device 3 Use th...

Page 38: ...Cards which support Auto Negotiation and the Fast Link Pulse FLP coding for the 100BASE TX signaling system When connecting a NIC to the PXES4P Sereis it may be necessary to reload the NIC drivers on...

Page 39: ...plex and auto sensing for speed See section 2 2 When the connected device is 10 Mbps the PXES4P obeys all the rules of 10 Mbps Ethernet configurations The 10 Mbps users share a 10 Mbps traffic domain...

Page 40: ...ning them to one port and relieving the rest of the network from processing them A packet whose destination address is on another port segment will be forwarded to the appropriate port and will not be...

Page 41: ...ently used addresses To reset the address buffer cycle power down and up 4 2 Auto cross MDIX Auto negotiation and Speed sensing The RJ 45 ports support auto cross MDI or MDIX in the auto negotiation m...

Page 42: ...ation and which go to the default state accordingly The Switch advertises its capability for 10 or 100 Mbps speed and F H duplex mode and the device at the other end of the cable should similarly adve...

Page 43: ...connectivity is lost between the ends of the twisted pair segment or a loss of power occurs in the unit or remote device The Link ports are also represented by LA1 LA2 LA3 LA4 Steady On or steady Off...

Page 44: ...also straightforward and is discussed in Section 4 Should problems develop during installation or operation this section is intended to help locate identify and correct these types of problems Please...

Page 45: ...g installation About 90 of network downtime can be attributed to wiring and connector problems 3 Make sure that an AC power cord is properly attached to each PXES4P Series unit Be certain that each AC...

Page 46: ...e following points a The nature and duration of the problem b Situations when the problem occurs c The components involved in the problem d Any particular application that when used appears to create...

Page 47: ...urn Material Authorization RMA Procedure All returns for repair must be accompanied by a Return Material Authorization RMA number Please have the following information readily available Name and phone...

Page 48: ...EATON the unit will be returned as No Problem Found EATON reserves the right to charge for the testing of non defective units under warranty Testing and repair of product that is not under warranty w...

Page 49: ...electro static shock damage to the unit 2 Clearly mark the Return Material Authorization RMA number on the outside of the shipping container 3 EATON is not responsible for your return shipping charges...

Page 50: ...an Time Between Failures for this product is 225 000 hours 25 years After the initial warranty period it is most cost effective for the customer to repair the unit on an as needed basis rather than pa...

Page 51: ...le before you call I fit is determined that your equipment require service we will issue an RMA number You will be asked for contact information including your name address phone number and E mail add...

Page 52: ...container or a container of sufficient strength and protection to Eaton Corporation Eaton Corporation will not be responsible for damage incurred during shipping to us Customer is responsible for shi...

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