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Cisco 3600 Series Hardware Installation Guide
OL-2056-02
Chapter 5 Installing Memory in the Router
Replacing DRAM and SDRAM
Figure 5-4 Removing the Cisco 3660 Mainboard Tray
Caution The mainboard is an ESD-sensitive component. To avoid damage, observe all ESD precautions.
When you are ready to replace the mainboard tray, see the “Replacing the Cisco 3660 Mainboard Tray”
section on page 5-33.
Replacing DRAM and SDRAM
Cisco 3600 series routers use two types of dynamic random access memory (DRAM):
• DRAM SIMMs (Used in Cisco 3620 and Cisco 3640 Routers), page 5-7
• SDRAM DIMMs Used in the Cisco 3631 and Cisco 3660 Router, page 5-14
Note SIMMs and DIMMs cannot be interchanged between the router models.
VCC OK
SYSTEM
FDX
LINK
100Mbps
FDX
1
0
LINK
100Mbps
ETH 0
ETH 3
ETHERNET
4E
ETH 2 ETH 1
123
ACT
LINK
0
CN/LPRXC
SERIAL 3 SERIAL 2
SERIAL 1 SERIAL 0
RXDTXC
TXD
CN/LPRXCRXDTXCTXD
CN/LPRXCRXD
TXC
TXD
CN/LPRXCRXDTXCTXD
EN
SERIAL
4T
VOICE
2V
V0
V1
EN
HIGH SPEED SERIAL
1HSSI
HS
TD
TC
RD
RC
LB/CN
SEE MANUAL BEFORE INSTALLATION
VIC
FXS
IN USE
IN USE
1
0
17335
Tray levers
1
22
3