3Com 5000 Series Installation Manual page 52

3Com Router 5000 Family
Installation Guide
which is connected to a 120Ω E1 trunk cable. The 120Ω E1 trunk cable is then
connected to the peer device.
120Ω banlanced
twisted pair cable
Figure 4-34 Extending E1 120Ω balanced twisted pair cable
Step 4: Observe the status of the Link LED for the E1 interface. ON means that a link is
present. OFF means that no link is present and you need to check the line.
III. Connecting T1 interface to DSU/CSU
1) Introduction to the T1 interface
T1 interface, which stands for channellized CT1/PRI interface, is responsible for
forwarding and processing T1 data flow, delivering CT1 access and implementing ISDN
PRI function. Its attributes are listed in the following table.
Table 4-9 T1interface attributes
Connector type
Interface standard
Maximum baud rate
Matching cable
Operating mode
Function
Note:
For the T1 module, corresponding serial interface shall be created after you use the
timeslot bundling command on the Controller T1 interface.
DB-15
RJ-45
Network connector
assembly
Attribute
RJ45
G.703/T1 102, G.704
1.544Mbps
T1 cable (100Ω standard shielded cable)
T1, CT1, ISDN PRI
Backup
Terminal access
ISDN
3Com Corporation
Chapter 4 Installation of the Router
RJ-45
120Ω E1
trunk cable
Description
4-25
DDN