Cisco 3825 Hardware Installation Guide - Page 397

38 C H A P T E R Connecting 8-Port T1/E1 Network Modules This chapter describes how to connect 8-port T1/E1 network modules for Cisco integrated service routers. It contains the following sections: • Cisco T1/E1 Network Module, page 38-1 • Safety Warnings for the Cisco T1/E1 Network Module, page 38-1 • Cisco T1/E1 Network Module LEDs, page 38-2 • Connecting a T1/E1 Network Module to a Network, page 38-3 Cisco T1/E1 Network Module The Cisco T1/E1 network module provides 8 ports of clear channel or channelized T1 and E1 support to Cisco 3800 series integrated services routers: • Cisco 3825 • Cisco 3845 T1 support has integrated CSU/DSU capability. Safety Warnings for the Cisco T1/E1 Network Module The following safety warnings apply to installation procedures involving the Cisco T1/E1 network module. Translations of these warnings are available in the Cisco Network Modules and Interface Cards Regulatory Compliance and Safety Information document, which is available online. Warning To avoid electric shock, do not connect safety extra-low voltage (SELV) circuits to telephone-network voltage (TNV) circuits. LAN ports contain SELV circuits, and WAN ports contain TNV circuits. Some LAN and WAN ports both use RJ-45 connectors. Use caution when connecting cables. Statement 1021 Warning Hazardous network voltages are present in WAN ports regardless of whether power to the unit is OFF or ON. To avoid electric shock, use caution when working near WAN ports. When detaching cables, detach the end away from the unit first. Statement 1026 OL-2485-20 Cisco Network Modules Hardware Installation Guide 38-1