Cisco uBR924 Installation Manual page 42

Chapter 2 Preparing for Installation
Approvals and Regulations
Users should not attempt to make such connections themselves, but should contact the
Caution
appropriate electric inspection authority, or electrician, as appropriate.
The Ringer Equivalence Number (REN) assigned to each terminal device denotes the percentage of the
total load to be connected to a telephone loop which is used by the device, to prevent overloading. The
termination on a loop may consist of any combination of devices subject only to the requirement that
the total REN of all the devices does not exceed five.
Cisco uBR924 Router Hardware Installation Guide
2-10
OL-0338-01 (3/2000)