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Loopback Tests for T1/56K Lines
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When a serial line does not come up as it must, the best way to troubleshoot the circuit is to perform loopback tests. Loopback tests allow you to isolate pieces of the circuit, and test them separately. Begin loopback tests on the customer premises...
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www.cisco.com/en/US/tech/tk713/tk628/technologies_tech_note09186a00800a754b.shtml
06 Mar 2008
This document discusses ways to verify the performance of the digital modems at the network access server (NAS) as well as the T1/E1 line connected to the NAS. It will not discuss the performance or configuration of the client side modems. For more information on this subject, refer to...
www.cisco.com/en/US/tech/tk801/tk36/technologies_tech_note09186a008009478d.shtml
09 Jul 2007
This document describes various error events that occur on T1 lines and provides troubleshooting information to fix these errors. Most common T1 problems can be solved by using this document in conjunction with the T1 Layer 1 Troubleshooting, T1 Alarm Troubleshooting, and T1 PRI Troubleshooting...
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www.cisco.com/en/US/tech/tk713/tk628/technologies_tech_note09186a00801095a3.shtml
09 Sep 2005
Valuable time and resources are often wasted replacing hardware that actually functions properly. This document helps you to troubleshoot common hardware issues on Cisco AS5200 and Cisco AS5300 series routers, and provides pointers for identifying whether or not there is a hardware fault. This...
www.cisco.com/en/US/products/hw/univgate/ps501/products_tech_note09186a00800b479c.shtml
09 Mar 2009
...itself. Refer to Hard Plug Loopback Tests for T1/56K Lines and verify whether you...described in the Hard Plug Loopback Tests for T1/56K Lines document. Ask the Telco...
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www.cisco.com/en/US/tech/tk713/tk628/technologies_tech_note09186a00801509d7.shtml
05 Jun 2005
...maui-nas-03(config-controlle)#no loopback Refer to Loopback Tests for T1/56K Lines for information on how to perform a hard...
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www.cisco.com/en/US/tech/tk713/tk628/technologies_tech_note09186a0080104552.shtml
29 Jan 2008
This document discusses the implementation of Cisco Catalyst series switches in your network, specifically the Catalyst 4500/4000, 5500/5000, and 6500/6000 platforms. Configurations and commands are discussed under the assumption that you are running Catalyst OS (CatOS) General Deployment software 6.4(3)...
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www.cisco.com/en/US/products/hw/switches/ps4324/products_tech_note09186a0080094713.shtml
29 Nov 2007
...build T1 loopback plugs and do loopback testing, please read Loopback Tests for T1/56K Lines. It is useful to have this plug available...
www.cisco.com/en/US/tech/tk39/tk356/technologies_q_and_a_item09186a0080111162.shtml
27 Aug 2009
...Troubleshooting Flowchart Troubleshooting Serial Lines Loopback Tests for T1/56K Lines Here are some references to use for troubleshooting...
www.cisco.com/en/US/products/hw/routers/ps274/products_tech_note09186a0080094aef.shtml
07 Jul 2005
...Troubleshooting Flowchart Troubleshooting Serial Lines Loopback Tests for T1/56K Lines Here is a list of references to use for troubleshooting...
www.cisco.com/en/US/products/hw/routers/ps259/products_tech_note09186a0080094ae0.shtml
09 Mar 2009
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