Cisco 1751 - Manual (Page 73)

C-7
Cisco 1751 Router Hardware Installation Guide
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Appendix C Installing and Upgrading Memory and Packet Voice Data Modules
Installing a Packet Voice Data Module
Figure C-3 Installing a DIMM
Installing a Packet Voice Data Module
You can install up to two packet voice data modules (PVDMs) to support
enhanced versions of digital signal processors (DSPs).
There are five types of PVDMs:
• PVDM-4—Supports one DSP
• PVDM-8—Supports up to two DSPs
• PVDM-12—Supports up to three DSPs
• PVDM-16—Supports up the four DSPs
• PVDM-20—Supports up to five DSPs
Each DSP supports two analog voice ports or one ISDN BRI port. Each analog
VIC used with the Cisco 1751 router has two voice ports and requires a single
DSP. The 2-port ISDN Voice-BRI requires two DSPs.
Table C-1 shows the
possible combinations of PVDMs and voice ports for the Cisco 1751 router.
The Cisco 1751 router has two PVDM slots. Any of the PVDMs can occupy either
slot. The total number of DSPs provided by one or two PVDMs installed in those
slots must be greater than or equal to the number of DSPs required by the number
and type of VICs installed, as described in
Table C-1 .
2
2
1
DIMM module
DIMM slot
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DIMM slot guides