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34 CHAPTER 2: INSTALLATION
n 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
n DS3/E3 module—a board consisting of one DS3 or E3 port. It is typically used
for terminating/accessing the public or private ATM WAN services. However,
depending on your local applications, you can also use the DS3/E3 module for
taking local DS3 or E3 ATM traffic across the WAN. Install the DS3/E3 module
in expansion slot 9. Figure 8 shows the DS3/E3 module connections.
Figure 8 DS3/E3 Module Connections
PBX
T1-DSX/E1
Network