First place to look for links to other sites is: http://www.itprc.com/ Thanks to Irwin Lazar Next stop: http://www.protocols.com/ And of course: http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/index.htm For CSU/DSU and T-1s http://www.larscom.com/support/multimedia/acrobat/access-t/access-t.pdf Print pages 9 to 19 for the T-1 section. This is an example of great documentation. Print more if you wish. > -----Original Message----- > From: Talib [mailto:[EMAIL PROTECTED]] > Sent: Friday, December 22, 2000 9:57 AM > To: [EMAIL PROTECTED] > Subject: Re: what is a CSU/DSU? > > > Is there a website where there are basics and details about > ISDN, DSL, Cable and T1s? > > > Zhiping Li wrote: > > > Hi,ciscoer: > > > > when I study cisco ccnp, > > I always find CSU/DSU, > > what are them? > > what are their use? > > Are they some kind of MODEM? > > thanks . > > > > __________________________________________________ > > Do You Yahoo!? > > Yahoo! Shopping - Thousands of Stores. Millions of Products. > > http://shopping.yahoo.com/ > > > > _________________________________ > > FAQ, list archives, and subscription info: > http://www.groupstudy.com/list/cisco.html > > Report misconduct > and Nondisclosure violations to [EMAIL PROTECTED] > > _________________________________ > FAQ, list archives, and subscription info: > http://www.groupstudy.com/list/cisco.html > Report misconduct > and Nondisclosure violations to [EMAIL PROTECTED] > _________________________________ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]