Need to Know More?

Glauser, Fred, and Eric Quinn. CCNP BCRAN Exam Cram 2 , 2003, Que, ISBN: 0-7897-3020-0.

Cisco CCO Web site, Troubleshooting Frame Relay, http://www.cisco.com/en/US/customer/tech/tk713/tk237/technologies_tech_note09186a0080093bd4.shtml

Cisco CCO Web site, Troubleshooting Layer 1/Serial Links Flow Chart: http://www.cisco.com/en/US/customer/tech/tk713/tk584/technologies_tech_note09186a00800a70f3.shtml