3Com SuperStack II PathBuilder S330 Reference Manual page 30

16 C 2: I
HAPTER NSTALLATION
Voice compression module — A board consisting of one T1-DSX or E1
interface. It services traffic generated by your existing PBXs, channels, T1/E1
multiplexers, CSU/DSUs, and video conferencing devices. Install the voice
compression module in slot 7 or slot 8. Figure 7 shows the VCM module
connections.
Figure 7 Voice Compression Module Connections
PBX
T1-DSX/E1