Cisco 1003 User Manual page 21

The ISDN connection is regarded as a source of voltage that should be
Warning
inaccessible to user contact. Users should not attempt to tamper with or open any public
telephone operator (PTO)–provided equipment or connection hardware. Any hardwired
connection (other than by nonremovable, connect-one-time-only lug) must be made only
by PTO staff or suitably trained engineers. (To see translated versions of this warning, refer
to the section "Translated Safety Warnings" at the end of this publication.)
If you have a Cisco 1003 router, connect the other end of the straight-through BRI
Step 4
cable to the S/T interface on your NT1 device.
S/T interface
Straight-through
BRI cable
Installing Your Cisco 1003 or Cisco 1004 Router
NT1 device
Cisco 1003 and Cisco 1004 User Guide 21