Table 4-6 Pin assignment for the wires of the 120-ohm E1 twisted pair cable
Pins of the DB26
Male Connector
Wire Color Wire Type Cable Labels
X.1 Blue Twisted pair RX1+
X.2 White RX1-
X.3 Orange Twisted pair RX2+
X.4 White RX2-
X.5 Green Twisted pair RX3+
X.6 White RX3-
X.7 Brown Twisted pair RX4+
X.8 White RX4-
X.19 Gray Twisted pair TX1+
X.20 White TX1-
X.21 Blue Twisted pair TX2+
X.22 Red TX2-
X.23 Orange Twisted pair TX3+
X.24 Red TX3-
X.25 Green Twisted pair TX4+
X.26 Red TX4-
4.6 E1/T1 Surge Protection Transfer Cable
This section describes the E1/T1 surge protection transfer cable connecting the UELP to the
transmission board. This cable is optional.
Exterior
The E1/T1 surge protection transfer cable has a DB26 male connector at one end and a DB25
male connector at the other end, as shown in Figure 4-7.
4 BBU3900 Cables
BBU3900
Hardware Description
4-10 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 11 (2010-11-10)