Comtech EF Data SDM-9220 - Manual (Page 66)

SDM-9220/9230 Hardware Installation Guide
4-24 Memotec Inc.
leads of the analog voice port straight through, without crossing.
NOTE: All signals are listed from the PBX point of view.
NOTE: All signals are listed from the PBX point of view.
Figure 4-9: Four-wire E&M Connections
Figure 4-10: Two-wire E&M Connections
PBX-to-PBX Connection
Connection Through SDM-9220/9230
Connection Through SDM-9220/9230