3com 3031 Instruccion De Instalación
CE1/PRI Interface
145
Note: The configuration commands of AM interface are identical as those of
asynchronous serial interface and Modem except that the commands
asynchronous serial interface and Modem except that the commands
baudrate
and
modem auto-answer
cannot be used on AM interface.
Besides, the parameters, such as SLIP parameters, PPP parameters, DCC
parameters, IP address, firewall and standby center parameters, need to be
configured when AM interface is enabled. For detailed configuration of these
parameters, refer to related sections in this manual.
parameters, IP address, firewall and standby center parameters, need to be
configured when AM interface is enabled. For detailed configuration of these
parameters, refer to related sections in this manual.
CE1/PRI Interface
This section describes how to configure a CE1/PRI interface.
Introduction to CE1/PRI
Interface
In 1960s, the Time Division Multiplexing (TDM) technology gained increasingly
wide application in the data communications system along with the introduction
of Pulse Code Modulation (PCM) technology. So far, there exist two TDM systems
in the data communications system. One is the ITU-T recommended E1 system
that is widely adopted in Europe and P.R. China. The other is the ANSI
recommended T1 system that is widely used in North American and Japan. (The
system that Japan adopts is actually called J1. But it is usually regarded as a T1
system due to high similarity between them.)
wide application in the data communications system along with the introduction
of Pulse Code Modulation (PCM) technology. So far, there exist two TDM systems
in the data communications system. One is the ITU-T recommended E1 system
that is widely adopted in Europe and P.R. China. The other is the ANSI
recommended T1 system that is widely used in North American and Japan. (The
system that Japan adopts is actually called J1. But it is usually regarded as a T1
system due to high similarity between them.)
A CE1/PRI interface can work in either E1 mode (also called non-channelized
mode) and CE1/PRI mode (that is, channelized mode).
mode) and CE1/PRI mode (that is, channelized mode).
A CE1/PRI interface in E1 mode equals an interface of 2 Mbps data bandwidth, on
which, no timeslots are divided. Its logic features are the same like those of a
synchronous serial interface. It supports the link layer protocols such as PPP, FR,
LAPB and X.25 and the network protocols such as IP and IPX.
which, no timeslots are divided. Its logic features are the same like those of a
synchronous serial interface. It supports the link layer protocols such as PPP, FR,
LAPB and X.25 and the network protocols such as IP and IPX.
When working in CE1/PRI mode, it is physically divided into 32 timeslots
numbered from 0 to 31. Among them, timeslot 0 is used for transmitting the
synchronizing information. This interface can be used as either a CE1 interface or
a PRI interface.
numbered from 0 to 31. Among them, timeslot 0 is used for transmitting the
synchronizing information. This interface can be used as either a CE1 interface or
a PRI interface.
■
When this interface is used as a CE1 interface, all the timeslots except timeslot
0 can be randomly divided into multiple channel-sets and each set can be used
as an interface upon timeslot bundling. Its logic features are the same as those
of a synchronous serial interface. It supports the link layer protocols such as
PPP, FR, LAPB and X.25, and the network protocols such as IP and IPX.
0 can be randomly divided into multiple channel-sets and each set can be used
as an interface upon timeslot bundling. Its logic features are the same as those
of a synchronous serial interface. It supports the link layer protocols such as
PPP, FR, LAPB and X.25, and the network protocols such as IP and IPX.
■
When the interface is used as a PRI interface, timeslot 16 will be used as a D
channel to transmit signaling. Therefore, rather than selecting among all the
timeslots, you are only allowed to make a ransom B channel selection among
the timeslot sets except the timeslots 0 and 16. The selected set of timeslots
can be bundled together with timeslot 16 to form a pri-set that can be used as
an interface. The logic features of this interface will be the same like those of
an ISDN PRI interface. It will support the link layer protocol PPP and network
protocols such as IP and IPX and can be configured with parameters such as
DCC.
channel to transmit signaling. Therefore, rather than selecting among all the
timeslots, you are only allowed to make a ransom B channel selection among
the timeslot sets except the timeslots 0 and 16. The selected set of timeslots
can be bundled together with timeslot 16 to form a pri-set that can be used as
an interface. The logic features of this interface will be the same like those of
an ISDN PRI interface. It will support the link layer protocol PPP and network
protocols such as IP and IPX and can be configured with parameters such as
DCC.
Configuring CE1/PRI
Interface
Perform the following tasks to configure a CE1/PRI interface:
■
Enter the specified interface view
■
Set interface operating mode