Knowledgebase patton support knowledgebase article. I was hoping someone coul explain some of the parameters listed. A software loopback towards the router usually only loops the dsu functionality of a csu dsu. T1 csu dsu interface converter snmp t2500fiberdsl line. The hst3000s preprogrammed tests and customized scripts help all technicians, including novice users, follow the same procedures, eliminating mistakes from improper test configurations or incorrect procedures.
I was reading on the forums that the loopback connects pins. Jan 07, 2016 sunil c has been working with cisco technical assistance center for over five years, serving cisco partners and customers in european time zone. I have my circuit terminated on a rj48s, using r1 on pin 1, t1 on pin 2, t on ping 7, and r on pin 8. That unit is a fairly sophisticated csu dsu, and can take a module to allow it to do drop and insert, which is what is needed to share a t1 for data, and voice lines for the pbx. Performing hard plug loopback tests on e1t1 ports youtube. What that module does is add another t1 interface, which you can connect to the pbx, and you can take say half the t1 channels and send them to the router, and the. This is because a software loopback back towards the router will usually only loop the dsu functionality of a csudsu, whereas a hardware loopback is able to prove that the entire csudsu is not at fault. Csu 31xx quick reference pattern and monitor setup. Once service is verified through the smart jack, you should see if you can plug the loopback plug at the end of your internal or inside wiring. Loopip6610e754ethrtppg 75 ohm e1 wan port and 4 ethernet ports w router. A csudsu operates at the physical layer layer 1 of the osi model. The loopt2500 ft1 csudsu standalone provides t1 network access cost. That unit is a fairly sophisticated csudsu, and can take a module to allow it to do drop and insert, which is what is needed to share a t1 for data, and voice lines for the pbx.
A csudsu channel service unitdata service unit is a digitalinterface device used to connect data terminal equipment dte, such as a router, to a digital circuit, such as a digital signal 1 ds1 t1 line. Data service unit dsu mengelola kontrol saluran, dan mengubah input dan output antara frame rs232c, rs449, atau v. You can think of it as a very highpowered and expensive modem. The unit allows connection of highspeed digital data to a t1 facility. Test it on a known good router with a csudsu t1 interface. This note only discusses the simple 4wire data terminal. The loopback plug will allow the local phone company to test through the smart jack and verify if the service is working properly through that point. Ciscoicsudsumib provided by cisco ciscoicsudsumib file content.
Figure 159 illustrates the basic topology of the csu dsu local and remote loopback tests. The adtran tsu ace is a lowcost, fullfeatured t1ft1 data service unit channel service unit dsu csu. The multicolor leds on the front panel provide both line. Removing carrier initiated loop on service modules and serial with external csu dsu. I know with t1e1 controller based modules you can issue a no loopback under the controller and remove a carrier initiated loop. The csu can also echo loopback signals from the phone company for testing purposes.
Dds csudsu and t1 csudsu and framestart fse reference. You can construct your own loopback plug for a t1 csudsu. Dds csudsu and t1 csudsu and framestart fse reference manual. What is a loopback interface on a cisco router duration. Unplug the hardware from the wall outlet before cleaning. Model 2500 series models 2500, 2510, 2520 allrate csudsu. Soft loopbacks also known as software loops or soft loops are commands from test equipment that cause a network interface unit niu or csu to automatically send traffic back towards the sender. May 26, 2019 csu dsu channel service unit data service unit is a hardware device of the same size as an external modem, it is capable of converting the data frames used in the lan to a compatible data format. A csu dsu channel service unitdata service unit is a hardware device about the size of an external modem that converts a digital data frame from the communications technology used on a local area network lan into a frame appropriate to a widearea network wan and vice versa. I spoke with my telco us signal and they said they tested up to the smart jack but could not test it up to csudsu cisco 1751 router with wic1 dsu t1. Hi, if you serial interface is detecting interface looped most likely your carried has not succesfully drop the loopback when they were doing testings, that is, assuming that you checked you csu dsu unit, but since you said that youve tried other csu dsu s is your carrier provider who needs to drop that loop at some point on that circuit. Configuration may be done using the externally accessible hardware switches or by using the software switches. The multicolor leds on the front panel provide both line side and dte side with status indicators.
Dsu mengelola kesalahan waktu dan regenerasi sinyal. We offer insight into the challenges of delivering managed mobility services, the managed mobility market and the benefits of partnering with emm vendors. The unit is suitable for wall mounting or desktop use. For most platforms, the command takes the form loopback, loopback dte or loopback local. For an internal csudsu, the software loopback is implemented with a cisco ios configuration command. Hi, if you serial interface is detecting interface looped most likely your carried has not succesfully drop the loopback when they were doing testings, that is, assuming that you checked you csudsu unit, but since you said that youve tried other csudsus is your carrier provider who needs to drop that loop at some point on that circuit. The interface to the t1 network is made through an integral esf csu which provides full performance monitoring of the t1 span and is compliant. Csudsu white papers, software downloads, definition and. Csu juga dapat menggemakan echo sinyal loopback dari perusahaan telepon untuk tujuan pengujian. To aid with circuit monitoring, the t1 esf csu gathers. The t1 csu ace is a compact, fullfeatured t1 channel service unit used to connect t1 data terminal equipment dte and t1 facilities. To perform this test, a t1 loopback plug is required. The data service unit dsu manages line control, and converts input and output between rs232c, rs449, or v.
The csu is a device that connects a terminal to a digital line. Whenever you are experiencing connectivity issue on the e1t1ethernet a great tool to. Supports up to 2 customer equipment interfaces including e1 icsu, serial dte, router, and g. Know when and how to troubleshoot your t1 internet connection. If the csu sees a good signal from either the circuit or a hardwire t1 loopback the correct display will be. The unit is designed to provide alarms, loopbacks, signal regeneration, line build out, and surge protection. Test it on a known good router with a csu dsu t1 interface.
Typically, the two devices are packaged as a single unit. A csudsu channel service unitdata service unit is a digitalinterface device used to connect a data terminal equipment device or dte, such as a router, to a digital circuit for example a t1 or t3 line. Sets the loopback at the remote csudsu, which sends packets all the way to the remote end of the connection before reflecting them back to the router. Solution reduces tdm lease cost by grooming multiple partial ds1 circuits into a one or more fully utilized t1s. For more extensive network testing, the unit uses bantam jack access for external test equipment. Cisco 1921 sec t1 bundle router dsucsu desktop, rackmountable overview and full product specs on cnet. Software switches can be accessed from the front panel control port using a vt100 type rs232 terminal that responds to ansi escape sequences. Most network devices and programs ship with socalled mib files to describe the parameters and meanings i. Figure 1 cisco t1 dsucsu wan interface card the updated cisco t1 data service unit channel service unit dsucsu wan interface card wic is an. Cisco t1 dsucsu wan interface card wic1dsut1v2 updated t1 wan interface card with integrated dsucsu simpli. Place the loopback plug into the t1 port and you should see the unit synch to itself by indicating either link or having whatever is used for the wan interface to show the unit now has sync. Sunil c has been working with cisco technical assistance center for over five years, serving cisco partners and customers in european time zone. One can be made from a piece of ethernet cable using the loopback adapters and crossover cables for t1 and dds circuits document.
It has been quite some time since ive had to turnup and test ds0s, but i am needing a loopback plug to test a 56k circuit. Hardware loopback of hwic csu dsu hwic1dsut1 i have a 2811 router running 12. The adtran tsu ace is a lowcost, fullfeatured t1ft1 data service unit channel service unit dsucsu. The updated cisco t1 data service unitchannel service unit dsucsu wan interface card wic is an integrated, fully managed dsucsu for t1 or fractional t1 service. Cpe csudsu procurve secure router to loop the t1 interface towards the network. Black box mt1500a t1ft1 csu dsu connects to the network using a rj48 connector. Loopt2500 ft1 csu dsu series supports local control and diagnostics using 2line by 16character lcd display and keypads or rs232 console port. A hard loopback also known as a hard loop is a physical loop created by wire.
Csu and dsu remote loopback tests for hdlc or ppp links. Hardware loopback of hwic csudsu hwic1dsut1 i have a 2811 router running 12. Before you can operate your model 2500 series csudsu, you must configure the unit. Loopt2500 ft1 csudsu series supports local control and diagnostics using 2line by 16character lcd display and keypads or rs232 console port. Transmit signal is looped back as the receive signal at a point close to the physical network interface. Soft loopback testing is accomplished with a set of cisco ios software. How to make a t1 loopback plug for testing both line and. For an internal csu dsu, the software loopback is implemented with a cisco ios configuration command. Loop telecoms lowcost loope 1510 fe1 interface converter series provides a line card solution used in loopc 5400 platform. Providing the ultimate csudsu for tdm lease line cost containment. Do not place this product on an unstable cart, stand, or table. If the output of the show interfaces serial exec command indicates that the serial line is up but the line protocol is down, use the csu dsu loopback tests to determine the source of the problem.
Refer to the manufacturer for an explanation of print speed and other ratings. Loope1510 in c5400 is used as highdensity racktype e1 csudsu platform. The tsu ace provides an interface between t1 or fractional t1 service and the end users data terminal equipment dte for applications such as lantolan bridging, frame relay circuit termination and videoconferencing. A csudsu channel service unitdata service unit is a hardware device about the size of an external modem that converts a digital data frame from the communications technology used on a local area network lan into a frame appropriate to a widearea network wan and vice versa. If this equipment causes harm to the telephone network, the telephone company will notify you in advance that temporary discontinuance of service may be required. Perform the local loop test first, and then the remote test. The data service unit dsu manages line control, and converts input. Csu dsu channel service unit data service unit is a hardware device of the same size as an external modem, it is capable of converting the data frames used in the lan to a compatible data format. Black box mt1500a t1ft1 csudsu connects to the network using a rj48 connector. Csudsus are also made as separate physical products. If you are struggling to deliver managed mobility services, this guide is meant to help. Dsu functionality integrated with an intelligent csu in a compact package.
I spoke with my telco us signal and they said they tested up to the smart jack but could not test it up to csu dsu cisco 1751 router with wic1 dsu t1. I have a loopback plug connected to the port on the hwic and i want to know what commands id need to enter in the interface configuration of ser000 to test the interface card. Troubleshooting layer 2 protocols over t1 using the cli. A loopback plug or an rj48x connector can create this hard loopback. T1 loopback plug for testing both line and csudsu powered. The dsu manages timing errors and signal regeneration. On routers with builtin csudsus 2524 or 2525 you can add the payload keyword, which creates the loopback at the dsu. Loopt ft1 csudsu can be configured via a front panel interface, local terminal. Although you can do both software and hardware loopback tests on a csudsu, a loopback plug is.
Introduction this application note discusses a number of the issues associated with installing a channel service unit csu or data service unit dsu on a customers premises. Supports d4ami or b8zsesf line coding, loopback diagnostics. Loopt ft1 csudsu model 2500 model 500 stand alone users. The wic1dsut1v2 is an updated version of the wic1dsut1, offering additional supported features with the same performance. A hardware loopback is able to prove that the entire csu dsu is not at fault. Loop telecom designs, develops, and manufactures hardware and software for. This loops the circuit from inside the csudsu back towards the router, and therefore isolates that section of the circuit. If this equipment causes harm to the telephone network, the telephone company will notify you in advance that temporary discontinuance of. Purpose built for cell site applications to provide ds10 grooming and remote management. This allows users to execute inservice diagnostics and fault isolation.
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