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Understanding Transmit and Receive Levels on Modems
This document provides an explanation of transmit (Tx) and receive (Rx) levels on modems.
19 Nov 2007
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...
09 Jul 2007
There are many different scenarios and permutations with regards to physically wiring cable modem termination systems (CMTSs). You could have a sparse mode where upstream (US) ports on the CMTS are kept separate, a dense mode where signal is fed to multiple US ports, multiple CMTSs on...
03 Apr 2006
This document briefly explains the basics of how to fine tune modems. For more information on how to configure specific modems, refer to the modem documentation links on 808hi.com
29 Jan 2008
There are a number of issues that can affect the performance and speed of cable modems in a Data-over-Cable Service Interface Specifications (DOCSIS) system. This document seeks to address the major causes of slow throughput from the perspective of a cable service provider.
24 Apr 2008
Modern analogue modem communications have become very complex. The latest technologies no longer rely on a simple basic layout, but expect the telephone company (Telco) cloud be built on digital technology end-to-end. This has led to a dramatic increase in bandwidth at the cost of...
03 Sep 2006
This document explains some troubleshooting steps used to determine the cause of Cable Modems dropping offline. Since, in the majority of cases, the cause will be a plant issue or low carrier-to-noise ratio, these issues will be the major emphasis of this document.
03 Sep 2006
This document describes Call Tracker outputs. Call Tracker is a subsystem used to capture detailed data on the progress and status of calls, from the time the network access server receives a setup request or allocates a channel, until a call is rejected, terminated, or otherwise disconnected.
26 Jan 2007
This document provides an explanation of the most common impairments that can be identified by examining the line shape parameter reported by the show modem operational-status command. This command is also discussed in the Overview of General Modem and NAS Line Quality, in the section Inspecting...
09 Sep 2005
...disconnection. On receiving this indication...channel in modem pass-through...count exceeded on DSP. 0x66...frame type in transmit queue. ...Client modem capability...capability on terminating...acknowledgement received. 0x7A...Requested to transmit info t_frame...
27 Feb 2006