Cisco SG300-52 SRW2048-K9-NA, can you plug in all 52 ports at the same time? Each combo mini-GBIC port has one 10/100/1000 Ethernet port and one mini-GBIC/SFP Gigabit Ethernet slot, with one port active at a time. Issue is some of the ports seem to be not working, not transferring data.

The Cisco switch will probably err-disable the port when you plug it in. The workaround is to add these commands:
Switch(config)#service unsupported-transciever
Switch(config)#no errdisable detect cause gbic-invalid
It'll either work or it won't!

Configure the Cisco to "log everything", and then try the iTunes download. Then, examine the log-files, to see which connections were blocked. Then, configure the firewall to "allow" those TCP-ports.

I had the same issue after what I thought was a succesful reset. It turns out I hadn't reset the switch completely. There is a reset pin hole next to the power switch. Hold it in with a paper clip for at least 30 seconds. ( I was holding in the power button for 30 seconds.)Then you can use the cisco admin and cisco for password defaults. Hope this helps someone in the future since I spent WAY TOO MUCH TIME on it :)

Disconnect all the Ethernet cables from all the ports.
Connect one of those eight "bad" ports to your laptop.
See if the port works when it is the ONLY active port.
If not, move the cable to the next of the eight "bad" ports, and test again. Repeat.
Move the cable to one of the 40 "good" ports, and test.
If it works, then you have a hardware problem with that "group" of 8 ports.

Your choice to use only the 40 "good" ports, or to replace the router, if you need those last 8 ports.

This isn't a basic switch, it's effectively a router that you must configure it accordingly: a long process in which you must log it and do all the necessary adjustments, starting with the IP assignations for the other routers and the ports settings. The entire process can be found in the manual, Chapters 3 and 4 If you need the manual
http://www.cisco.com/en/US/docs/switches/lan/csbms/srw2048/administration/guide/SRW-US_v10_UG_A-Web.pdf

For mini-GBIC ports you have to set the media type under the interface settings

if you want to use fiber, set the meida type as fiber and for copper media type as rj45

Yuo need to install a driver for your network card. Go to the IBM WEB site to download a network driver for your particular model ThinkPad.

If you have device A connected to device B over a Gigabit link, and the link does not come up, perform this procedure.
Step-by-Step Procedure
1. Verify device A and B use the same GBIC, short wavelength (SX), long wavelength (LX), long haul (LH), extended wavelength (ZX), or copper UTP (TX). Both devices must use the same type of GBIC to establish link. An SX GBIC needs to connect with an SX GBIC. An SX GBIC does not link with an LX GBIC.

2. Verify distance and cable used per GBIC as defined by Cisco.

3. If either device has multiple Gigabit ports, connect the ports to each other. This tests each device and verifies that the Gigabit interface functions correctly. For example, you have a switch that has two Gigabit ports. Wire Gigabit port one to Gigabit port two. Does the link come up? If so, the port is good. STP blocks on the port and prevents any loops (port one receive (RX) goes to port two transmit (TX), and port one TX goes to port two RX).

4. If single connection or Step 3 fails with SC connectors, loop the port back to itself (port one RX goes to port one TX). Does the port come up? If not, contact the Cisco TAC, as this can be a faulty port.

5. If steps 3 and 4 are successful, but a connection between device A and B cannot be established, loop ports with the cable that adjoins the two devices. Verify that there is not a faulty cable.

6. Verify that each device supports 802.3z specification for Gigabit auto-negotiation. Gigabit Ethernet has an auto-negotiation procedure that is more extensive than the one used for 10/100 Ethernet (Gigabit auto-negotiation spec: IEEE Std 802.3z-1998). When you enable link negotiation, the system auto-negotiates flow control, duplex mode, and remote fault information. You must either enable or disable link negotiation on both ends of the link. Both ends of the link must be set to the same value or the link cannot connect. Problems have been seen when you connect to devices manufactured before the IEEE 802.3z standard was ratified. If either device does not support Gigabit auto-negotiation, disable the Gigabit auto-negotiation, and it forces the link up. Warning: Disabling auto-negotiation hides link drops or physical layer problems. Disabling auto-negotiation is only required if end-devices such as older Gigabit NICs are used which cannot support IEEE 802.3z. Do not disable auto-negotiation between switches unless absolutely required to do so, as physical layer problems can go undetected, which results in STP loops. The alternative is to contact the vendor for software/hardware upgrade for IEEE 802.3z Gigabit auto-negotiation support

Hi from the command line interface you will need to login and then type enable (enter) configure (enter), interface fast ethernet all (enter), no shutdown port (port #). Here is a link to the CLI manual if you need more help: http://www116.nortel.com/docs/bvdoc/baystack/doc_pdf/217152-A_CLI_Guide_for_Ethernet_Switch_325-425_Release_3.5.pdf Let me know how it goes or if you need more help. Regards