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E1 Interfaces
The E1 interface conforms to the ITU G.703 and G.704 electrical and signaling interfaces
recommendations. Two interfacing configurations are available:
• 75Ω unbalanced BNC coaxial connectors.
• 120Ω balanced 15 pin / RJ48 connectors with the pinouts shown here.
15 Pin
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
The 75Ω unbalanced interface provides two pair of 75Ω BNC connectors. The shield of the OUT
coaxial connection is attached to earth ground. A jumper is provided to optionally connect the shield of
the INPUT coaxial connection to ground as described in G.703. This jumper is located on the inside of
the E1 interface board, between each of the two BNC connectors. The E1 module must be removed to
access this option.
The 120Ω balanced interface provides two individual 120Ω 15-pin connectors.
TRACER 2 x E1 User's Manual
Function
E1 Out ring
Frame ground
E1 In ring
Frame ground
N.C.
N.C.
N.C.
N.C.
E1 Out tip
N.C.
E1 In tip
N.C.
N.C.
N.C.
N.C.
Section 2 Installation
RJ-48
Pin
Function
1
E1 Out ring
2
E1 Out tip
3
N.C.
4
E1 In ring
5
E1 In tip
6
N.C.
7
N.C.
8
N.C.
61280004L2-1C
13
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