Cisco AS5300 Manual page 13

The telecommunications lines must be disconnected 1) before unplugging the main power
connector and/or 2) while the housing is open.
Warning
The E1 interface card may only be installed in an ACA-permitted customer equipment or a Data
Terminal Equipment (DTE) that is exempted from ACA's permit requirements. The customer
equipment must only be housed in a cabinet that has screw-down lids to stop user access to
overvoltages on the customer equipment. The customer equipment has circuitry that may have
telecommunications network voltages on them.
Figure 3-10 Connecting to an E1 CSU/DSU
Figure 3-11 Connecting to a CSU/DSU