I am involved with an embedded software development for telecom industry. I have zero experience before with such embedded hardware devices.
I got a network processor board, which is featured in switching pipeline engines. Besides the board, there is also an accessory board called "piggy" (seems for ethernet connetion), and another serial line connection.
I am completely lost about these boards and serial line connections. what they are used for? I tried to use google to find some useful introduction or materials but failed. Can anyone point out what this piggy board is used for? Any good references or books that explain about this?