6-7
Configuring the Data Link Layer Protocol for E1, T1, and Serial Interfaces
Configuring the Logical Interface
Table 6-1 shows the main settings that you must configure for an E1, T1, or
serial interface connection that uses PPP.
Table 6-1. Options for Configuring an E1, T1, or Serial Interface with PPP
Interface
Configuration
Mode Context
Command Explanation Page
e1 • tdm-group <number> timeslots
<range of numbers>
• coding [ami | hdb3]
• frame format [e1 | crc4]
• clock source [internal | line |
through]
• no shutdown
• defines the number of channels used for
the E1 connection
• defines the line coding
• defines the frame format
• defines the clock source, or timing, for the
connection
• activates the interface
4-10
t1 • tdm-group <number> timeslots
<range of numbers>
• coding [ami | b8zs]
• frame format [esf | d4]
• clock source [internal | line |
through]
• lbo long <value> | lbo short <value>
• no shutdown
• defines the number of channels used for
the T1 connection
• defines the line coding
• defines the frame format
• defines the clock source, or timing, for the
connection
• sets the level of the transmit signal
• activates the interface
4-10
serial • serial-mode [EIA530 | V35 | X21]
• et-clock-source [txclock | rxclock]
• no shutdown
• configures the serial interface to support
the appropriate cable
• configures the serial interface to take the
clock from the transmit signal (txclock) or
from the receive signal, (rxclock)
• activates the interface
5-12
ppp • ip address <A.B.C.D> [<subnet
mask> | </prefix length>]
or
• ip address negotiated
or
• ip unnumbered <interface>
• no shutdown
• assigns a static IP address to the PPP
interface
• configures the PPP interface to negotiate
an IP address from its peer
• configures the PPP interface to use the IP
address assigned to another interface
• activates the interface
6-8
global
configuration or
interface
configuration
• bind <number> <physical interface>
<slot>/<port> [<tdm-group number>]
ppp <interface number>
• binds the physical interface to the PPP
interface
• requires a tdm-group number for T1 and E1
interfaces (but not for serial interfaces)
6-10