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The Cisco 3945 router supports two memory slots which has been installed two 512MB memory cards. When upgrading the memory, the same capacity of memory cards must be inserted into the two memory slots in the same time. It doesn't support to use only a single memory slot.

1. Note: The Cisco 3945 router supports two memory slots which has been installed two 512MB memory cards. When upgrading the memory, the same capacity of memory cards must be inserted into the two memory slots in the same time. It doesn't support to use only a single memory slot.
2. The C3945 comes with (4) EHWICs where such VWIC3-4MFT-T1/E1 cards can be inserted. Since each VWIC3 has (4) ports each, that would be total of 16 PRIs. Then let's say I want to put more Service Modules and allow me to expand it further. The C3945 can support up to (4) service modules.

Interface Cards

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HWIC-1FE 1-port 10/100 Routed Port HWIC
HWIC-2FE Two 10/100 routed port HWIC
HWIC-1GE-SFP GigE High Speed WIC With One SFP Slot
HWIC-1T 1-Port Serial WAN Interface Card
HWIC-2T 2-Port Serial WAN Interface Card
HWIC-4T 4-Port Serial HWIC
HWIC-1DSU-T1 1-Port T1/Fractional T1 DSU/CSU WAN Interface Card
HWIC-2A/S 2-Port Async/Sync Serial WAN Interface Card
HWIC-4A/S 4-Port Async/Sync Serial HWIC
HWIC-8A/S-232 8-Port Async/Sync Serial HWIC, EIA-232
HWIC-8A 8-Port Async HWIC
HWIC-16A 16-Port Async HWIC
HWIC-1CE1T1-PRI 1 port channelized T1/E1 and PRI HWIC
HWIC-2CE1T1-PRI 2 port channelized T1/E1 and PRI HWIC
HWIC-4T1/E1 4 port clear channel T1/E1 HWIC
VWIC2-1MFT-T1/E1 1-Port 2nd Gen Multiflex Trunk Voice/WAN Int. Card - T1/E1
VWIC2-2MFT-T1/E1 2-Port 2nd Gen Multiflex Trunk Voice/WAN Int. Card - T1/E1
VWIC2-1MFT-G703 1-Port 2nd Gen Multiflex Trunk Voice/WAN Int. Card - G.703
VWIC2-2MFT-G703 2-Port RJ-48 Multiflex Trunk - G.703
VWIC3-1MFT-T1/E1 1-Port 3rd Gen Multiflex Trunk Voice/WAN Int. Card - T1/E1
VWIC3-2MFT-T1/E1 2-Port 3rd Gen Multiflex Trunk Voice/WAN Int. Card - T1/E1
VWIC3-4MFT-T1/E1 4-Port 3rd Gen Multiflex Trunk Voice/WAN Int. Card - T1/E1
VWIC3-1MFT-G703 1-Port 3rd Gen Multiflex Trunk Voice/WAN Int. Card - G.703
VWIC3-2MFT-G703 2-Port 3rd Gen Multiflex Trunk Voice/WAN Int. Card - G.703
WIC-1AM-V2 one-port Analog Modem Interface card
WIC-2AM-V2 Two-port Analog Modem Interface Card
WIC-1B-S/T-V3 1-Port ISDN WAN Interface Card (dial and leased line)
HWIC-4B-S/T 4-port ISDN BRI High-Speed WAN Interface Card
HWIC-1B-U 1-Port ISDN BRI U High-Speed WAN Interface Card
HWIC-1VDSL 1-port VDSL2 HWIC
HWIC-1ADSL 1-port ADSLoPOTS HWIC
HWIC-1ADSLI 1-port ADSLoISDN HWIC
HWIC-ADSL-B/ST 2-port HWIC w/ 1-port ADSLoPOTS and 1-port ISDN BRI-S/T
HWIC-ADSLI-B/ST 2-port HWIC w/ 1-port ADSLoISDN and 1-port ISDN BRI-S/T
HWIC-1ADSL-M 1-port ADSL HWIC w/Annex M
HWIC-2SHDSL 2-pair G.SHDSL HWIC
HWIC-4SHDSL 4-pair G.SHDSL HWIC with IMA support
HWIC-4SHDSL-E 4-pair EFM Based HWIC
HWIC-CABLE-D-2 1-Port DOCSIS 2.0 Cable Modem HWIC
HWIC-CABLE-E/J-2 1-Port Euro/J-DOCSIS 2.0 Cable Modem HWIC
HWIC-4ESW Four port 10/100 Ethernet switch interface card
HWIC-4ESW-POE 4-Port Ethernet Switch HWIC with Power Over Ethernet
HWIC-D-9ESW Nine port 10/100 Ethernet switch interface card
HWIC-D-9ESW-POE 9-Port Ethernet Switch HWIC with Power Over Ethernet
EHWIC-4ESG Four port 10/100/1000 Ethernet switch interface card
EHWIC-4ESG-P Four port 10/100/1000 Ethernet switch interface card w/PoE
EHWIC-D-8ESG Eight port 10/100/1000 Ethernet switch interface card
EHWIC-D-8ESG-P Eight port 10/100/1000 Ethernet switch interface card w/ PoE
EHWIC-3G-HSPA-U 3G EHWIC HSPA Universal with GPS
EHWIC-3G-EVDO-S 3G EHWIC EDVO for Sprint with GPS
HWIC-3G-CDMA-S 3G HWIC Sprint EVDO Rev A/0/1xRTT 800/1900MHz, IOS 15.0(1)M1
HWIC-3G-CDMA-V 3G HWIC Verizon EVDO Rev A/0/1xRTT 800/1900MHz, IOS 15.0(1)M
HWIC-3G-CDMA-B 3G (for India only) HWIC BSNL EVDO Rev A/0/1xRTT 800/1900MHz
HWIC-3G-HSPA 3G HWIC (Non-US) HSPA/UMTS 850/1900/2100MHz; Quad-band 2G
HWIC-3G-HSPA-G 3G HWIC (Non-US) HSPA/UMTS 900/1900/2100MHz; Quad-band 2G
HWIC-3G-HSPA-A 3G HWIC ATT HSPA/UMTS 850/1900/2100MHz; Quad-band 2G
VIC3-2FXS/DID Two-Port Voice Interface Card- FXS and DID
VIC3-2FXS-E/DID Two-Port Voice Interface Card - FXS and DID (OPX Lite FXS)
VIC3-4FXS/DID Four-Port Voice Interface Card - FXS and DID
VIC3-2E/M Two-port Voice Interface Card - E and M
VIC2-2BRI-NT/TE Two-port Voice Interface Card - BRI (NT and TE)
VIC2-2FXO Two-port Voice Interface Card - FXO (Universal)
VIC2-4FXO Four-port Voice Interface Card - FXO (Universal)

Network Modules

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SM-NM-ADPTR Network Module Adapter for SM Slot on Cisco 2900, 3900 ISR

NM-1A-OC3-POM ATM OC3 module with single POM (SFP) slot
NM-1A-T3/E3 1-Port T3/E3 ATM network Module
NM-1T3/E3 One port T3/E3 network module
NM-8CE1T1-PRI 8 port channelized T1/E1 and PRI network module
SM-ES2-16-P Enhanced EtherSwitch, L2, SM, 15 FE, 1 GE, POE
SM-ES3-16-P Enhcd EtherSwitch, L2/L3, SM, 15 FE, 1 GE, POE
SM-ES3G-16-P Enhcd EtherSwitch, L2/L3, SM, 16GE, POE
SM-ES2-24 Enhanced EtherSwitch, L2, SM, 23 FE, 1 GE
SM-ES2-24-P Enhanced EtherSwitch, L2, SM, 23 FE, 1 GE, POE
SM-ES3-24-P Enhcd EtherSwitch, L2/L3, SM, 23 FE, 1 GE, POE
SM-ES3G-24-P Enhcd EtherSwitch, L2/L3, SM, 24 GE, POE
SM-D-ES2-48 Enhanced EtherSwitch, L2, SM, 48 FE, 2 SFP
SM-D-ES3-48-P Enhcd EtherSwitch, L2/L3, SM, 48 FE, 2 SFP, POE
SM-D-ES3G-48-P Enhcd EtherSwitch, L2/L3, SM, 48 GE, 2 SFP, POE
NM-16ESW 1 16 port 10/100 EtherSwitch NM
NM-16ESW-1GIG 1 16 port 10/100 EtherSwitch NM with 1 GE (1000BaseT) port
NME-16ES-1G EtherSwitch Service Mod 16 10/100T+ 1 GE,IP Base
NME-16ES-1G-P EtherSwitch Service Mod 16 10/100T POE + 1 GE,IP Base
EVM-HD-8FXS/DID High density voice/fax extension module - 8 FXS/DID
NM-HD-1V One-slot IP Communications Voice/Fax Network Module
NM-HD-2V Two-slot IP Communications Voice/Fax Network Module
NM-HD-2VE Two-slot IP Communications Enhanced Voice/Fax Network Module
NM-HDV2 IP Communications High-Density Digital Voice Network Module
NM-HDV2-1T1/E1 IP Communications High-Density Digital Voice NM with 1 T1/E1
NM-HDV2-2T1/E1 IP Communications High-Density Digital Voice NM with 2 T1/E1
NME-NAC-K9 Cisco NAC Network Module for 2800, 3800 ISR
NME-IPS-K9 Cisco IPS NM for 2811, 2821, 2851 and 3800
SM-SRE-700-K9 Services Module with Services Ready Engine (SRE)
SM-SRE-900-K9 Services Module with Services Ready Engine (SRE)
SM-700-VMSS-K9 Cisco SRE 700 SM with VMSS Bundle
SM-900-VMSS-K9 Cisco SRE 900 SM with VMSS Bundle
NME-WAE-502-K9 WAAS Network Module For 2800, 3800 ISR - 1GB RAM, 120GB HDD
NME-NAM-120S Cisco Branch Routers Series Network Analysis Module
NME-CUE Cisco Unity Express Network Module Enhanced (8 Ports Incl.)
NME-UMG Cisco Unified Messaging Gateway
NME-UMG-EC Cisco Unified Messaging Gateway - Enhanced Capacity
NME-CUSP-522 Cisco Unified SIP Proxy NME-522
NME-APPRE-302-K9 Application Runtime Engine - (512MB RAM 80GB HDD)
NME-APPRE-502-K9 Application Runtime Engine - (1GB RAM 120GB HDD)
NME-APPRE-522-K9 Application Runtime Engine - 3800 ONLY (2GB RAM 160GB HDD)
NME-AIR-WLC6-K9 6-AP WLAN Controller NM for Cisco 2800/3800 Series
NME-AIR-WLC12-K9 12-AP WLAN Controller NM for Cisco 2800/3800 Series
NME-AIR-WLC25-K9 25-AP WLAN Controller NM for Cisco 2800/3800 Series
EVM-IPVS-16A 16 Port Analog Video Gateway

Expansion Modules

Memory Options

MEM-3900-1GU2GB 1GB to 2GB DRAM Upgrade (1GB+1GB) for Cisco 3925/3945 ISR
MEM-CF-256U512MB 256MB to 512MB CF Upgrade for Cisco 1900,2900,3900 ISR
MEM-CF-256U1GB 256MB to 1GB Compact Flash Upgrade for Cisco 1900,2900,3900
MEM-CF-256U2GB 256MB to 2GB Compact Flash Upgrade for Cisco 1900,2900,3900
MEM-CF-256U4GB 256MB to 4GB Compact Flash Upgrade for Cisco 1900,2900,3900
MEMUSB-1024FT 1GB USB Flash Token

Power Supply Options

PWR-3900-POE Cisco 3925/3945 AC Power Supply with Power Over Ethernet
PWR-3900-DC Cisco 3925/3945 DC Power Supply
PWR-3900-AC/2 Cisco 3925/3945 AC Power Supply (Secondary PS)
PWR-3900-POE/2 Cisco 3925/3945 AC Power Supply with POE (Secondary PS)
PWR-3900-DC/2 Cisco 3925/3945 DC Power Supply (Secondary PS)

SFP Options for GE Ports

GLC-LH-SM GE SFP, LC connector LX/LH transceiver
GLC-SX-MM GE SFP, LC connector SX transceiver
GLC-ZX-SM 1000BASE-ZX SFP
GLC-FE-100FX 100BASE-FX SFP for FE port
GLC-FE-100LX 100BASE-LX SFP for FE port
GLC-FE-100EX 100BASE-EX SFP (40km)
GLC-FE-100ZX 100BASE-ZX SFP (80km)
GLC-BX-D 1000BASE-BX SFP, 1490NM
GLC-BX-U 1000BASE-BX SFP, 1310NM

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AIMs

PVDMs

PVDM2-ADPTR PVDM2 Adapter for PVDM Slot on Cisco 2900, 3900 Series ISR

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PVDM3-16 16-channel high-density voice and video DSP module
PVDM3-32 32-channel high-density voice and video DSP module
PVDM3-64 64-channel high-density voice and video DSP module
PVDM3-128 128-channel high-density voice and video DSP module
PVDM3-192 192-channel high-density voice and video DSP module
PVDM3-256 256-channel high-density voice and video DSP module
PVDM2-8 8-Channel Packet Voice/Fax DSP Module
PVDM2-16 16-Channel Packet Voice/Fax DSP Module
PVDM2-32 32-Channel Packet Voice/Fax DSP Module
PVDM2-48 48-Channel Packet Voice/Fax DSP Module
PVDM2-64 64-Channel Packet Voice/Fax DSP Module