Motorola DIMETRA MTS 2, Installation, Configuration And Basic Service Manual

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X.21, E1-120 Ω Cabling Chapter 4: Hardware Installation
Figure 4-52 E1/X.21 and Ethernet Site Link Connectors on the MTS 4 Junction Panel
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 4-5 and Table 4-6 show the pin assignment for E1 and X.21 connection.
The E1 connector described in Table 4-5 contains two E1 lines. If only one line is needed,
use Receive 1 and Transmit 1. Be aware that the Pin de
fi
nitions on the Site Controller are
different from the E1 connector on the Junction Panel.
Figure 4-53 Site Link Connector E1 Pinout
Table 4-5 Site Link Connector E1 on Junction Panel
Pin No. Function
1 Receive 1 positive
2 Receive 1 negative
4-54
6802800U74-N September 2009