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Loopback pinouts and schemes listing @ pinouts.ru Parallel port Loopback (Norton) pinout Used to verify that a port is working. Serial port Loopback for PassMark (9 pin) pinout Used to verify that a port is working. Serial port Loopback for Passmark (25 pin) pinout Used to verify that a port is working. pinouts.ru /pin_LoopbackCables.shtml   (194 words)

Loopback - Wikipedia, the free encyclopedia A loopback interface is a type of 'circuitless IP address' or 'virtual IP' address, as the IP address is not associated with any one particular interface (or circuit) on the host or router. Likewise, to ping the loopback interface is a basic test that one's IP stack is working properly. Loopback addresses are the subject of a reasonably common Internet prank: directing an inexperienced user to connect to (or attack) his own loopback interface as if it were a remote server [1]. en.wikipedia.org /wiki/Loopback   (483 words)

Loopback   (Site not responding. Last check: 2007-11-07) The most commonly used IP address on the loopback network is 127.0.0.1 for IPv4 and ::1 for IPv6. Loopback addresses are the subject of a reasonably common Internet prank : directing an inexperienced user to connect to (or attack) his own loopback interface as if it were a remote server. In telephone systems, a loopback is a test signal sent to a network destination that is returned as received to the originator. www.serebella.com /encyclopedia/article-Loopback.html   (995 words)

Loopback Bit Error Ratio Measurement Description When the test set measures loopback bit error ratio, it sends a known data pattern (see DL DTCH Data) on the downlink dedicated traffic channel (DTCH) to a UE that is configured in loopback mode 1 or 2. Loopback delay is measured at the UE antenna connector and is specified in units of radio frames. To calculate loopback delay, the test set correlates the data in the uplink radio frame to the data sent in the downlink radio frame. wireless.agilent.com /rfcomms/refdocs/wcdma/wcdma_meas_loopber_desc.php   (1793 words)

T1/E1 Loopback Operation for Dallas Semiconductor T1/E1/J1 transceivers - Maxim/Dallas In loopback mode, the device loops the signal from one end of the device to the other end of the sending device after it has passed through a network or across a particular link. In diagnostic loopback, data, clock, and frame-pulse indication generated by the transmit section of the SCT are used instead of the corresponding signals from the physical layer device. Per-Channel loopback is a sub-set of Payload loopback. www.maxim-ic.com /appnotes.cfm/appnote_number/3349   (1199 words)

Loopback: Facts and details from Encyclopedia Topic   (Site not responding. Last check: 2007-11-07) The internet protocol (ip) is a data-oriented protocol used by source and destination hosts for communicating data across a packet-switched internetwork.... Loopback addresses are the subject of a reasonably common Internet prank[For more, click on this link]: directing an inexperienced user to connect to (or attack) his own loopback interface as if it were a remote server. Such packets are known as "martian packet[Follow this hyperlink for a summary of this subject]s". www.absoluteastronomy.com /encyclopedia/l/lo/loopback.htm   (921 words)

CCNA - Unconnected serial int A loopback INTERFACE is different; it's not used for testing, but to give the router a virtual "interface" that is always up, although it obviously isn't very useful for sending data anywhere. The way I understood it from drcisco was that setting "loopback" on a serial interface is the same as setting "loopback local" on an interface on a WIC and that both these commands will cause outbound packets to be looped back onto the local interface. Loopback commands are generally used so that someone can use a piece of test equipment to send bit patterns toward the loop, and make sure you get the same bit pattern back. www.examnotes.net /archive18-2001-2-9550.html   (1687 words)

What are Loopback's Video-Conferencing /ISDN Test Services?   (Site not responding. Last check: 2007-11-07) For testing a video-conferencing installation, Loopback provides a remote loop which allows the user to see himself in both the local and remote window. Loopback provides a remote loop facility for digital calls from one to 23 channels. By calling Loopback, the customer tests equipment operation, connection to the local phone company, connection to the long distance carrier, and capability to receive a signal from a remote facility. www.loop-back.com /loopsvcs.htm   (204 words)

Loopback Company Information   (Site not responding. Last check: 2007-11-07) Loopback's mission is to provide our customers the freedom to test their equipment from anywhere, at any time. Loopback is the leader in developing innovative methods to deliver ISDN testing facilities to users throughout the United States. Loopback is distinguished by its service and support, the most comprehensive in the industry. www.loop-back.com /coinf.htm   (312 words)

Cisco - Understanding Loopback Modes on Cisco Routers Loopbacks are an important part of troubleshooting; they are used to isolate the fault on and end-to-end circuit (especially when the circuit is down). The loopback line command under an ATM interface of a Cisco router causes incoming traffic to be sent back to the network. Loopbacks are a useful tool to use when you are troubleshooting failed circuits. www.cisco.com /warp/public/121/atmloopback.html   (949 words)

PCAUSA - NDIS Loopback Discussion NDIS loopback can be used loop the broadcast packet back to the local host where it is "received" as if it was actually from the network. When a packet is sent on a physical miniport (lowest-level) the loopback packet is the packet that was originally passed to the miniport - not the actual packet as it was sent "on the wire". One artifact of this is that is a request-response scenario the response may actually be received before the loopback of the request that initiated the response. www.ndis.com /papers/loopback.htm   (1539 words)

ISDN Tester - BRI Loopback Device The Loopback Device simply plugs into the NT unit and may be called from any speech or data terminal (phone, router, video conferencing unit etc). If Loopback devices are dispatched to all remote sites, they may be called outside hours by an automatic call generation system to gather complete network management status information. The low cost Loopback device from Astricom is the perfect tool to ensure and prove reliable operation of ISDN basic rate lines from anywhere, at any time. www.astricom.com /isdnloopback.htm   (444 words)

Who Benefits from Loopback ISDN & Video-Conference Testing?   (Site not responding. Last check: 2007-11-07) Loopback's service cost is negligible when compared to the cost of the lost productivity of people, the cost of the equipment, and/or the reduced cost of outside support. Loopback can help short-circuit these delays by assisting users and technical staff in quickly identifying working and non-working equipment. Loopback's service allows any user who can place a video call to participate in testing a problem site. www.loop-back.com /benefits.htm   (341 words)

Define loopback test - a definition from Whatis.com A loopback test is a test in which a signal in sent from a communications device and returned (looped back) to it as a way to determine whether the device is working right or as a way to pin down a failing node in a network. One type of loopback test is performed using a special plug, called a wrap plug, that is inserted in a port on a communications device. In telephone systems, the signal sent as part of a loopback test is referred to as a loopback. searchnetworking.techtarget.com /sDefinition/0,,sid7_gci817047,00.html   (214 words)

IT Architect | A Field Guide to Loopback Plugs | March 1, 2000   (Site not responding. Last check: 2007-11-07) A loopback plug connects pin 1 with pin 3 and pin 2 with pin 6. If the hub/switch comes up at one speed when you plug in the loopback plug and the NIC comes up at the other speed when the loopback plug is inserted then the ports may be configured differently. By plugging in the loopback plug you can force the errors and confirm that the hub/switch is partitioning ports correctly. www.networkmagazine.com /article/DCM20000426S0004   (1811 words)

Executing pipelines from inside an orchestration: Introducing the LOOPBACK adapter Why not make your own loopback adapter by writing a bogus solicit-response adapter that returns a response BizTalk IBaseMessage that is a copy of the original request message. When I try and configure the port using the loopback adapter to return a message of type string (which I thought it would be, seeing that I used the flat file assembler) it gives me an error: Received unexpected message type '' does not match expected type 'string'. Loopback simply means that data sent out will be delivered back to the source (usually without actually going across a network). geekswithblogs.net /gwiele/archive/2004/11/10/14737.aspx   (1334 words)

Cisco - Loopback Tests for T1/56K Lines Software local loopbacks are usually implemented with a Cisco IOS configuration command, or with a loopback button for some CSU/DSUs. These loopback tests are done with the assistance of the telco, but are not done independently by the telco. For these loopback tests, you must involve the telco since you are ask them to provide loopbacks towards your premises from the telco switches. www.cisco.com /warp/public/471/hard_loopback.html   (1993 words)

DS31256 Loopback Modes - Maxim/Dallas These loopback modes can be used in channelized and unchannelized modes, depending on which mode has been configured for a given port. When local loopback is enabled on a high-speed unchannelized port, a data-sampling problem can occur, depending on the port clock frequency. This is because the propagation delays of the clock and data signals within the chip are aligning in such a way as to cause the data to be sampled while it is not stable. www.maxim-ic.com /appnotes.cfm?an_pk=399   (808 words)

Loopback Processing of Group Policy This policy is intended for special-use computers (for example, computers in public places, laboratories, and classrooms), where you must modify the user policy based on the computer that is being used. However, there may be instances when a computer object resides in a specific OU, and the user settings of a policy should be applied based on the location of the computer object instead of the user object. In some cases, this processing order may not be appropriate (for example, when you do not want applications that have been assigned or published to the users in their OU to be installed while they are logged on to the computers in some specific OU). support.microsoft.com /?kbid=231287   (576 words)

The Loopback Root Filesystem HOWTO   (Site not responding. Last check: 2007-11-07) When a ramdisk is used to boot from (as is often done on Linux installation disks or rescue disks) then the disk image (the entire contents of the disk as a single file) can be stored on the boot floppy in a compressed form. It is a very simple one that allows the loopback device to be used as the root filesystem. If this stage fails to set up the loopback device as the root device then you may see a message that there is no root device and the kernel aborts. www.faqs.org /docs/Linux-mini/Loopback-Root-FS.html   (3113 words)

Microsoft SQL Server: loopback for MSSQL Loopback per se is no requirement for SQL Server. This IP number - yes it also is called loopback - has no direct relation to either the MS loopback adapter or SQL Server. The MS loopback adapter is just a kludge to get these functions in when your PC has no network board. www.experts-exchange.com /Databases/Microsoft_SQL_Server/Q_10038435.html   (597 words)

DB9 serial (RS232) loopback. Pinout and signals for building a serial port loopback (CheckIt) The PC loopback plug is a useful diagnostic tool. The loopback plug connects serial inputs to serial outputs so that the port may be tested. DNC Precision is the unique feature-packed NC operation and management software, allowing full control of the process via serial port, which operates as a multiple NC management gateway allowing for secure access to numerically controlled device. www.aggsoft.com /rs232-pinout-cable/serial-port-loopback-db9-c.htm   (108 words)

Define loopback - a definition from Whatis.com Sending a loopback test to each telephone system piece of equipment in succession, one at a time, is a technique for isolating a problem. (The loopback can be compared to the Internet's ping utility, which lets you send a message out to a host computer on the Internet. If you are an ISDN user with more than one B-channel, you can do a loopback test from your computer. searchnetworking.techtarget.com /sDefinition/0,,sid7_gci212501,00.html   (207 words)

What is loopback address? - A Word Definition From the Webopedia Computer Dictionary Loopback address is a special IP number (127.0.0.1) that is designated for the software loopback interface of a machine. The loopback interface has no hardware associated with it, and it is not physically connected to a network. The loopback interface allows IT professionals to test IP software without worrying about broken or corrupted drivers or hardware. www.webopedia.com /TERM/L/loopback_address.html   (81 words)

Loopback Processing and Deny Apply in ACL   (Site not responding. Last check: 2007-11-07) Loopback off - the SOM for the user is calculated and then user Loopback merge mode - the SOM for the user is calculated as in A. The Loopback replace mode - the SOM for the user is not considered. www.windowsforumz.com /-Loopback-Processing-Deny-Apply-ACL-ftopict223389.html   (2945 words)

Loopback and spoofing - Wilders Security Forums But LnS binds also to my loopback interface- when there is "incoming connection with my IP address", it can also be application using my loopback interface, which should not be blocked. As long as you authorize the application using loopback, whether it be "just this time/just this session/always allow" I do not really see what the problem is. If LnS were not to warn you at all you might have a situation similar to Sygate's loopback issue. I would like to be able to see clear distinction in LnS where my rules influence loopback, and where my network interface, like adding a column for interface, to which rule applies- that how it is done in "big" commercial firewalls. www.wilderssecurity.com /showthread.php?t=61975   (1081 words)

The Loopback Interface As you can see, the loopback interface has been assigned a netmask of 255.0.0.0, since 127.0.0.1 is a class-A address. However, if you run the rwhod daemon on your host, you may have to set the loopback device's broadcast address in order for rwho to function properly. However, the loopback interface is useful not only as an example in networking books, or as a test-bed during development, but is actually used by some applications during normal operation. www.tldp.org /LDP/nag/node66.html   (588 words)

A P P E N D I X A - Loopback Connectors Loopback connectors are designed for the testing of communication ports. Note - Loopback connectors must be wired properly and connected firmly for the Serial Port tests to work correctly. The following table depicts the pin assignments for most loopback plugs and cables that may be used when testing a system. docs.sun.com /source/817-7665/AppendixA.html   (735 words)

Frage zu iptables und loopback Schnittstelle - Security Forum   (Site not responding. Last check: 2007-11-07) Zu gut deutsch heisst doch das: alles was über loopback reinkommt und das Protokoll tcp sowie den Zielport 80 hat soll verworfen werden. Loopback ist eigentlich nur dann interessant wenn man A) einen Dienst lokal nutzen möchte oder B) ein Dienst mit einem anderen lokalen Dienst kommunizieren muss. Das passt schon besser, man könnte aber auch andere loopback adressen nutzen halt 127.0.0.0/8. board.protecus.de /t15343.htm   (551 words)

Aaron Stebner's WebLog : Installing Microsoft Loopback Adapter In the demos I did, I was doing remote debugging, but the loopback adapter can be useful for any activities that require a network connection but one is not available to you, such as.NET remoting. Hi Frank - at a really high level, the loopback adapter allows you to simulate having your computer on a network without actually connecting to a live network. Loopback adaptor worked for me after I closed the emulator without saving and did a clean restart. blogs.msdn.com /astebner/archive/2004/07/06/174576.aspx   (740 words)

AnandTech   (Site not responding. Last check: 2007-11-07) This is a function of the Linux kernel that lets you do things like mount ISO files without burning it to a CD, create an encrypted filesystem, hide a filesystem with steganography, create initialization RAM disks for boot CDs and floppies, and much, much more. You can omit this, but the loopback device that was used will remain bound to the file. Use losetup to bind the partition to a loopback device with encryption. www.anandtech.com /guides/viewfaq.html?i=137   (1449 words)

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