Cisco Systems 4000 appendix Inspecting the System

Inspecting the System

In addition, you might need the following additional external equipment:

•Data service unit (DSU) to connect each serial port to an external network.

•To connect a serial port to a T1 network, you need a T1 channel service unit/data service unit (CSU/DSU) that converts the High-Level Data Link Control (HDLC) synchronous serial data stream into a T1 data stream with the correct framing and ones density.

(Some telephone systems require a minimum number of one bit per time unit in a data stream, called ones density.) Several T1 CSU/DSU devices are available as additional equipment, and most provide either a V.35, EIA/TIA-449, or EIA-530 electrical interface.

•Ethernet transceiver.

•Network Terminator 1 (NT1) for BRI connections in North America.

•Before installing a G.703/G.704 network processor module, ensure that you have one of the following adapter cables:

—75-ohm, unbalanced adapter cable (CAB-E1-BNC-3M)

—120-ohm, balanced adapter cable (CAB-E1-TWINAX-3M)

Inspecting the System

Before unpacking the system, make certain that you are ready to install it. If the final installation site is not ready, keep the chassis in its shipping container to prevent accidental damage. After determining where you want the system installed, proceed with the unpacking.

The router, cables, publications, CD, and any optional equipment you ordered might be shipped in more than one container. When you unpack each shipping container, check the packing list to ensure that you received all of the following items:

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Router

6-foot (1.8-meter) power cord

Bag of rubber feet for desktop mounting

Optional equipment (which might include network connection cables)

Preparing to Install Cisco 4000 Series Routers 2-9