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Table 6

Voice Interface Cards for the Cisco 1751

VWIC-2MFT-E1-DI

VWIC-1MFT-G703

VWIC-2MFT-G703

1. The Cisco 1751 can support three VIC-4FXS/DID cards with a maximum of four ports in DID mode

Voice Implementation Requirements

The Cisco 1751 Modular Access Router supports FXO, FXS, E&M, ISDN BRI VICs, and T1/E1 multiﬂex V/WICs.

The FXO interface allows an analog connection to the central ofﬁce of the Public Switched Telephone Network

(PSTN). The FXS interface connects basic telephone service phones (home phones), fax machines, key sets, and PBXs

through ring voltage and dial tone. The E&M interface allows connection for PBX trunk lines (tie lines). The

ISDN-BRI NT/TE VIC is used to connect to the PSTN or a PBX/KTS, whereas the T1/E1 multiﬂex V/WIC (multiﬂex

V/WIC) supports both data and voice services. The multiservice-ready Cisco 1751-V router version includes all the

features needed for immediate integration of data and voice services:

• One DSP—(PVDM-256K-4)

• 32-MB Flash memory

• 64-MB DRAM

• Cisco IOS IP/VOX Plus feature set

VICs and WICs are available separately.

The Cisco 1751 and Cisco 1751-V routers have two DSP module slots on the motherboard and a maximum of eight

DSPs are supported per router.

DSP Requirements

Cisco 1751 routers support 3 types of DSP images: high complexity (HC), medium complexity (MC) and Flexi-6.

HC and MC are used for analog

MC is introduced in Cisco 1751 starting from Cisco IOS 12.2(8)YN release, which will merge into 12.3(1)T.

Therefore, please make sure to use Cisco 12.2(8) YN or later releases when using MC. In addition, starting from

12.2(8)YN release, the default DSP image for BRI VIC is changed from HC to Flexi-6. Table 7 lists the default images

for each type of VICs; Table 8 lists IOS support for each DSP image. Table 9 lists the number of channels supported

by one DSP (PVDM-256K-4) for each codec type.

Please use the following rules for calculating DSP requirements on the Cisco 1751:

1. For the Early Deployment (ED) releases: Cisco IOS 12.2(2)XK, 12.2(4)XW, 12.2(4)XL, 12.2(4)XM, 12.2(4)YA,

12.2(4)YB, 12.2(8)YL, 12.2(8)YM and 12.2(11)YT, or T train releases prior to 12.3(1)T:

1. Analog VICs include VIC-2FXS, VIC-2FXO, VIC-2FXO-M1, VIC-2FXO-M2, VIC-2FXO-M3, VIC-2FXO-EU, VIC-2E/M, VIC-2DID,VIC-4FXS/

DID

2. T1/E1 VWICs include VWIC-1MFT-T1, VWIC-2MFT-T1, VWIC-2MFT-T1-DI, VWIC-1MFT-E1, VWIC-2MFT-E1, VWIC-2MFT-E1-DI,

VWIC-1MFT-G703, VWIC-2MFT-G703

Two-port RJ-48 multiﬂex trunk - E1 with drop and insert

One-port RJ-48 multiﬂex trunk - E1 G.703

Two-port RJ-48 multiﬂex trunk - E1 G.703

and BRI (VIC-2BRI-NT/TE) VICs; Flexi-6 is used for T1/E1 VWICs

Cisco Systems, Inc.

Page 12 of 19

and BRI VIC.