User guide

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Figure 7. TMUX Length, Coding, and Clocking Configuration.
5.5 TMUX RJ45 to BNC Converter Cable
If the E1 devices to the “outside” of the TMUX units does not have RJ45 (a.k.a RJ48C in
the telephony industry) port capability then a “conversion cable” is needed. In this case,
the E1 device has BNC 75ohm ports, on for Tx and one for Rx.
It is very important to note that the T1/E1 RJ45 terminated cable is not identical to
Ethernet 100 Mbps full duplex RJ45 terminated cable; the pinouts are different (See
Section 6.11 in the Canopy T1/E1 Multiplexer User Guide).
Such conversion cables are available from a number of vendors. Motorola recommends
that high quality cable be employed in this circuit emulation application context.
Figure 8. E1 BNC to RJ45/RJ48C Converter
Figure 8 illustrates a typical E1 BNC to RJ45 converter cable. Note that the RJ45 part of
the cable length, in the instance, is stipulated as being “shielded foil” and Category 5.