2620 serials router hardware book

2621 router hardware book 
2641 router hardware book

Interface card hardware book

interface card introduction
Preparing for interface card inatsllation

Interface card installlation

WIC Ethernet interface card installlation

FIC Ethernet interface card installation

Serial port card installation
E1 card installation
T1 card installation
ISDN BRI interface card installation
Multifunctional interafce card
Async MODEM card installation
Voice card installation
Extended interface card installation

Compound card installation

Module hardware book

Router Software configuration book 

Index of router command