3Com 3C63311 Reference Guide - Page 46
Voice compression module, DS3/E3 module,
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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 PBX T1-DSX/E1 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 Network