Clear-Com HX System Frames - Manual (Page 105)

Figure 36: Matrix to Matrix direct E1 Trunking
E1 trunking between matrices can also be achieved over an E1 network, as shown
Figure 34: E1 Trunking with an E1 Network .
In this case E1 ports 1 and 5 of the E-QUE interface are connected using standard straight-
through CAT-5 cables rather than crossover CAT-5 cables.
105 Eclipse HX-Omega User Guide