Clear-Com HX System Frames - Manual (Page 80)

Figure 35: Matrix to Matrix T1 Trunking
T1 trunking between matrices can also be achieved over a E1 network as shown in
Figure 33: T1 Trunking using a E1 Network .
In this case T1 ports 1 and 5 of the E-QUE rear card are connected using standard straight-
through CAT5 cables rather than crossover CAT5 cables.
80 Eclipse HX Matrix Frame Installation Guide