Pin on the DB26
Male Connector
Wire Color
Wire Type
Wire Label
X.22
Red
TX2-
X.23
Orange
Twisted pair
TX3+
X.24
Red
TX3-
X.25
Green
Twisted pair
TX4+
X.26
Red
TX4-
Table 7-29
Pin assignment for the wires of the 100-ohm T1 twisted pair cable
Pin on the DB26
Male Connector
Wire Color
Wire Type
Wire Label
X.1
Blue and white
Twisted pair
RX1+
X.2
White and blue
RX1-
X.3
Orange and white
Twisted pair
RX2+
X.4
White and orange
RX2-
X.5
Green and white
Twisted pair
RX3+
X.6
White and green
RX3-
X.7
Brown and white
Twisted pair
RX4+
X.8
White and brown
RX4-
X.19
Gray and white
Twisted pair
TX1+
X.20
White and gray
TX1-
X.21
Blue and red
Twisted pair
TX2+
X.22
Red and blue
TX2-
X.23
Orange and red
Twisted pair
TX3+
X.24
Red and orange
TX3-
X.25
Green and red
Twisted pair
TX4+
X.26
Red and green
TX4-
7.6.2 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. The length of an E1/T1 surge protection transfer cable
is 0.65 m (2.13 ft).
BTS3900C (Ver.C)
Hardware Description
7 BTS3900C Cables
Issue 03 (2013-05-27)
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