IEC07000247 V1 EN-US
Figure 71: Fibre-optic ports with ST type connectors
IEC07000248 V1 EN-US
Figure 72: G.703 codirectional port (RJ–45)
RJ–45 pin
Name Direction
1 Tx+ (TIP-out) From 21-216 transceiver to multiplexer
2 Tx- (RING-out) From 21-216 transceiver to multiplexer
4 Rx+ (TIP-in) From multiplexer to 21-216 transceiver
5 Rx- (RING-in) From multiplexer to 21-216 transceiver
Metal house Shield Cable shield must be connected
Use a cable with twisted pairs and a high quality shield. Foil shielding alone is not enough. Rx+ and
Rx- should form one twisted pair, and Tx+ and Tx- should form another. A Cat5 S/FTP cable
(shielded/foil-twisted pair) used, for example, in ethernet communication is a good cable. The outer
shield around the cable consists of a braided mesh. In addition, every twisted pair has a foil
shielding.
Section 5 1MRK505382-UEN Rev. K
Communication set-up
74 Communication set-up, 670/650 series
Application Guide
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