Saad,
The optional Convenience Input/Output Station feature is available for 
inserting or ejecting cartridges without interrupting the normal automated 
operations.
You have three options:
1) No Convenience Input/Output Station
2) A 10-cartridge Convenience Input/Output Station feature (reduces the overall 
library cartridge capacity by 30 cartridges).
3) A 30-cartridge Convenience Input/Output Station feature (reduces the overall 
library cartridge capacity by 80 cartridges).

The best manual for yr case is the following:
Title: Magstar 3494 Tape Library Introduction and Planning Guide
Document Number: GA32-0279-11

My recommendation is:
If you have off-site and DR requirements functions in a daily basis then you 
need at least the 10-cartridge I/O Station. The 3494 library can grow really 
big... I don't know yr installation but if you have a large 3494 installation
with frequent tape I/Os then you should consider the 30-cartridge I/O Station.

Good Luck.

Othonas



Saad Al-Sakran wrote:

> Hi...All
> we are planning to have Magstar Tape library 3494. We have an option to have 
> it with I/O station or not...please if any one know an online documentation 
> about I/O Station and its features and cababelities please send me the url.
>
> Best Regards
> Saad Al-Sakran
> LAN Administrator
> KFSH