Another questions concerning ODOM book, possible errata!

LBC90805

Hello me again asking another mundane question.

Page 406 in Odom's ICND1 book goes in depth about router physical installation. Im confused about a certain step in the process that is written out. Although the process is clear and apparent; the way it is written is confusing, once again, to myself. My question is about Step 3 not Step 2. Here they both are in order.

Step 2 - If using an external CSU/DSU, connect the router's serial interface to the CSU/DSU, and the CSU/DSU to the link from the telco.

Step 3 - If using an internal CSU/DSU, connect the router's serial interface to the line from the telco.

Shouldn't the last part of step three read "connect the link from the telco to the CSU/DSU" since it is internal. Wouldn't the pressencse of an internal CSU/DSU eliminate the need for a serial cable in the first place?

Also, how would you connect a serial interface to a line from the telco? Is there some type of adapter? Aren't the connectors for four wire telco lines generally RJ-48?

I'm confuserED.

LBC90805

Whoops, wrong forum - can someone please move this to the right forum CCENT/CCNA?

nice343

some T1 cards have built in CSU/DSU so you use an rj-48 to connect to telco

LBC90805

Exactly so you wouldn't hook the telco's line into the serials links interface. Doesn't make sense Verdad?

nice343

those t1 cards with intergrated CSU/DSU have a different type of an interface than the WIC-1T


http://www.cisco.com/en/US/prod/collateral/modules/ps2797/product_data_sheet09186a0080189f95.html