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Cisco 3700 Series Routers Hardware Installation Guide
OL-2180-07
Chapter 2 Preparing to Install the Router
Preparing to Connect to a Network
Token Ring Connections
The IEEE has established Token Ring as standard IEEE 802.5. Specifications indicate a maximum
segment distance of 328 feet (100 meters) for UTP cabling.
Note To ensure agency compliance with FCC Class B electromagnetic emissions requirements (EMI), make
sure that you use a shielded RJ-45 Token Ring cable when connecting your router to a Token Ring
network.
Token Ring can operate at two different ring speeds: 4 and 16 Mbps. All devices on the Token Ring must
use the same operating speed.
Use a Token Ring cable to connect the router to a switch. See the section “Token Ring Port Pinouts” in
the Cisco Modular Access Router Cable Specifications document for Token Ring port pinouts. This
document is available on Cisco.com.
Serial Connections
Serial connections are provided by WAN interface cards and network modules. For more information on
WAN interface cards, see the Cisco Interface Cards Installation Guide. For more information on
network modules, see the Cisco Network Modules Hardware Installation Guide. These documents are
available on Cisco.com.
Before you connect a device to a serial port, you need to know the following:
• Type of device—data terminal equipment (DTE) or data communications equipment (DCE)—that
you are connecting to the synchronous serial interface
• Type of connector—male or female—required to connect to the device
• Signaling standard required by the device
Configuring Serial Connections
The serial ports on the asynchronous/synchronous serial network modules and the serial WAN interface
card use DB-60 connectors. Serial ports can be configured as DTE or DCE, depending on the serial cable
used.
Serial DTE or DCE Devices
A device that communicates over a synchronous serial interface is either a DTE or a DCE device. A DCE
device provides a clock signal that paces the communications between the device and the router. A DTE
device does not provide a clock signal. DTE devices usually connect to DCE devices. The documentation
that accompanied the device should indicate whether it is a DTE or DCE device. (Some devices have a
jumper to select either DTE or DCE mode.) Table 2-2 lists typical DTW and DCE devices.
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