Huawei Technologies Proprietary
4-24
z For 120-ohm balanced twisted pair cable
Connect the cable in this way:
If you choose only a single RJ-45 connector, just connect the RJ-45 connector to the
peer device.
If you choose two RJ-45 connectors (for extending E1 interface cables), connect the RJ
connector of the 120-ohm balanced twisted pair cable to a network connector
assembly, which is connected to a 120-ohm E1 trunk cable. The 120-ohm E1 trunk
cable is then connected to the peer device.
DDN
DB-15
RJ-45
RJ-45
Router
120Ω banlanced
twisted pair cable
Network connector
assembly
120Ω E1
trunk cable
Figure 4-29 Extending E1 120-ohm 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 channelized CT1/PRI interface, is responsible for
forwarding and processing T1 data flows, delivering CT1 access and implementing
ISDN PRI function. Its attributes are listed in the following table.
Table 4-12 T1interface attributes
Attribute Description
Connector type RJ-45
Interface standard G.703/T1 102, G.704
Maximum baud rate 1.544Mbps
Matching cable
T1 cable (100Ω standard shielded cable)
Operating mode T1, CT1, ISDN PRI
Function
Backup
Terminal access
ISDN
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