Service Manual

6802800U74-AN

Chapter 4: Hardware Installation

Figure 78: Site Link Connector X.21 Pinout

Table 25: Site Link Connector X.21 on Junction Panel

Pin No. Function

1 Not Used

2 Tx Data B

3 Control B

4 Rx Data B

5 Indication B

6 Signal Timing B

7 Byte Timing B

8 Ground

9 Tx Data A

10 Control A

11 Rx Data A

12 Indication A

13 Signal Timing A

14 Byte Timing A

15 Not Used

4.10

Ethernet Site Link Cabling

Newer versions of the MTS 2 and MTS 4 Junction Panels contain breakouts for Ethernet Site Link

connectors (labeled as Link1 and Link2). To gain Ethernet site link functionality on these newer

versions of Junction Panel, remove the breakout(s) and insert a RJ45 coupler. For information on

placement on the Junction Panel, see the following figures.

Figure 79: MTS 2 Junction Panel E1/X.21 and Ethernet Site Link Connectors

X.21

E1 Ethernet Site Link