Service Manual

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6802800U74-AN
Chapter 4: Hardware Installation
Figure 75: E1/X.21 and Ethernet Site Link Connectors on the MTS 2 Junction Panel
Figure 76: E1/X.21 and Ethernet Site Link Connectors on the MTS 4 Junction Panel
NOTICE:
The network termination unit (NTU) in the same building shall provide the necessary isolation
between the X.21/E1 interface and the network, and should be approved for use by the
appropriate agency in the end user country.
Do not remove the supplied caplug and retaining bag from the D-type connector of the X.21 or
E1 cable.
A surge arrestor should be used. For full instructions and guidelines, please refer always to
Motorola Standards and Guidelines for Communications Sites, R56.
Table 24: Site Link Connector E1 on Junction Panel on page 133 and Table 25: Site Link Connector
X.21 on Junction Panel on page 134 show the pin assignment for E1 and X.21 connection.
The E1 connector described in Table 24: Site Link Connector E1 on Junction Panel on page 133
contains two E1 lines. If only one line is needed, use Receive 1 and Transmit 1. Be aware that the Pin
definitions on the Site Controller are different from the E1 connector on the Junction Panel.
Figure 77: Site Link Connector E1 Pinout
Table 24: Site Link Connector E1 on Junction Panel
Pin No. Function
1 Receive 1 positive
2 Receive 1 negative
3 Receive 2 positive
4 Transmit 1 positive
5 Transmit 1 negative
6 Receive 2 negative
7 Transmit 2 positive
8 Transmit 2 negative
X.21
E1 Ethernet Site Link
X.21
Ethernet Site Links
E1