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.
If you use an S7FTP patch cable for ethernet, be aware that a cross-connected cable
has only pairs on pin 1-2 and 3-6 cross-connected. The two remaining pairs are not
cross-connected.
Clock configuration switch
As of transceiver 21-216 revision 2, a rotary switch is added to the front panel to
ease installation and testing (see Figure
67).
When two transceivers 21-216 are used in a PDH system, they are set as slaves
when an external clock is used.
Clock synchronization configuration
The rotary switch on the front panel has 16 positions (HEX switch). At position 0
the switch’s arrow, visible through the adjusting hole, points straight down (see
Figure
67). In this position, external clock is selected (default).
IEC07000249 V1 EN-US
Figure 67: Rotary switch for clock synchronization configuration
1MRK 505 382-UEN B Section 5
Communication set-up
Communication set-up 670/650 series 2.2 81
Application Guide
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