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Table 9
The number of channels supported by one DSP (PVDM-256K-4) per codec type
G.711
2
2
G.729ab
/G.729a
2
G.726
2
G.723
2
G.728
2
Fax Relay
2
1. BRI VIC support in Flexi-6 starts from 12.2(8)YN or 12.3(1)T.
2. G.729 and G.729b is not supported in MC or Flexi-6 images.
Table 10
DSP Modules Available on Cisco 1751
Modules
PVDM-256K-4
PVDM-256K-8
PVDM-256K-12
PVDM-256K-16HD
PVDM-256K-20HD
Cisco IOS Software Feature Sets
The Cisco 1751 Router supports a choice of Cisco IOS Software feature sets. Each feature set requires specific
amounts of Flash and DRAM memory in the product. For default memory configurations, please see Table 11.
Table 11
Cisco 1751 Router Memory Defaults and Maximums
Model Number
Cisco 1751
Cisco 1751-V Multiservice Model
The Cisco 1751 Router supports a choice of Cisco IOS Software feature sets with rich data features as well as data/
voice features (Table 12). Each feature set requires specific amounts of RAM and Flash memory in the product.
• Cisco IOS IP base feature sets include: NAT, OSPF, RADIUS, and NHRP.
• Plus feature sets contain L2TP, L2F, the Border Gateway Protocol (BGP), IP Muliticast, Frame Relay SVC, RSVP,
the NetWare Link Services Protocol (NLSP), AppleTalk SMRP, the Web Cache Control Protocol (WCCP), and
the Network Timing Protocol (NTP).
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Firmware
4
4
4
-
-
4
DSPs
1 DSP Module
2 DSP Modules
3 DSP Modules
4 DSP Modules
5 DSP Modules
Default FLASH/Maximum FLASH
16 MB/16 MB
32 MB/32 MB
Cisco Systems, Inc.
Page 14 of 19
6
3
3
2
2
3
Default DRAM/Maximum DRAM
32 MB/96 MB
64 MB/128 MB