Cisco 3700 series

3-25
Cisco 3700 Series Routers Hardware Installation Guide
OL-2180-08
Chapter 3 Installing the Router
Connecting to a Console Terminal or Modem
Figure 3-27 Connecting a Modem to the Auxiliary Port on a Cisco 3745 Router
Identifying a Rollover Cable
Use a rollover cable to connect to the asynchronous serial console and auxiliary ports. You can identify
a rollover cable by comparing the two modular ends of the cable. Holding the cables side by side, with
the tab at the back, the wire connected to the pin on the outside of the left plug should be the same color
as the wire connected to the pin on the outside of the right plug. (See Figure 3-28.) If your cable came
from Cisco, pin 1 will be white on one connector, and pin 8 will be white on the other (a rollover cable
reverses pins 1 and 8, 2 and 7, 3 and 6, and 4 and 5).
Figure 3-28 Identifying a Rollover Cable
72069
E
N
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DSU
56K
C
D
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D
Modem
AUX port
connector
(RJ-45)
Pin 1
Pin 8
H3824
Pin 1 and pin 8
should be the
same color