048 Mbps) and E3 (34.368 Mbps) are European standards similar to T1
and T3, but they possess different bandwidths and frame structures.
1 DS0
24 DS0s
672 DS0s
DS0 64 kbps
DS1 or T1 1.544 Mbps
DS3 or T3 43.736 Mbps
Configuring Serial Encapsulation 385
in this type of environment. Clock rates in bits per second are as follows: 1200,
2400, 4800, 9600, 19200, 38400, 56000, 64000, 72000, 125000, 148000, 500000,
800000, 1000000, 1300000, 2000000, and 4000000.
Step 4 Enter the speci?¬?ed bandwidth for the interface. The bandwidth
command overrides the default bandwidth that is displayed in the show
interfaces command and is used by some routing protocols, such as the
Enhanced Interior Gateway Routing Protocol (EIGRP), for routing
metric calculations. The router also uses the bandwidth for other types of
calculations, such as those required for the Resource Reservation
Protocol (RSVP). The default bandwidth for serial lines is T1 speed
(1.544 Mbps). The bandwidth entered has no effect on the actual speed
of the line.
The show controller command displays information about the physical interface itself.
This command is useful with serial interfaces to determine the type of cable connected
without the need to physically inspect the cable itself.
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