Table 6-14 describes the pin assignments of the E1 120-ohm or T1 100-ohm balanced twisted
pair cable.
Table 6-14 Pin assignments of the E1 120-ohm or T1 100-ohm balanced twisted pair cable
Connector X1 (DB9) X2 (RJ45) Tip Color
Pin assignment 1 4 White and orange
2 5 Orange
6 1 White and Blue
7 2 Blue
E1/T1 Trunk Cable Extension
NOTE
The E1/T1 trunk cable is 3 m long. If the connection distance is long, a cable extension is required.
l E1 75-ohm unbalanced coaxial cable: BNC to BNC (The two connectors are BNC 75 angle male-II.)
l E1 120-ohm or T1 100-ohm balanced twisted pair cable: RJ45 to RJ45 (The two connectors are RJ45.)
The E1 75-ohm unbalanced coaxial cable is connected as follows:
l If the E1 trunk cable extension is not used, the BNC connector is connected to the remote
device.
l If the E1 trunk cable extension is used, the BNC connector is connected to a coaxial
connector, and the coaxial connector is connected to the remote device through the cable
extension, as shown in Figure 6-15.
CAUTION
The Tx end of the E1 trunk cable is connected to the Rx end of the remote device, and the
Rx end is connected to the Tx end.
Figure 6-15 E1 75-ohm unbalanced coaxial cable extension
Router
DB9
connector
BNC
E1 75-ohm
unbalanced
coaxial cable
Coaxial
connector
E1 75-ohm
cable extension
DDN
BNC
Huawei AR1200&2200&3200 Series Enterprise Routers
Hardware Description 6 Cables
Issue 03 (2012-04-20) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
146
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