5
votes
3answers
521 views

Can internet gateways be plugged straight into a layer 2 switch?

tl;dr Internet gateways (eg., cable modems, fiber optic gateways) don't function properly when they aren't behind a device with "layer 3" or routing capabilities, correct? Incredibly long backstory ...
0
votes
5answers
1k views

New office cabling: should we use CAT7 or CAT6a? [closed]

We are going to do the cabling in our new office building and we are thinking to lay down 10Gbit cables since we use HP switches that come with 10Gbit ethernet ports. We will also lay down few fiber ...
2
votes
3answers
148 views

Gigabit switches

We currently in our office have a 20 Mbps fiber optic internet connection with Time Warner. We decided to upgrade our connection to 100Mbps. When the technicians came out, they upgraded the circuit ...
6
votes
2answers
532 views

What kind of cable is this?

I need to cost out some switching and figure out how to network a PC to this type of network. Clarifying: This is to connect units in a high rise facility. Each unit has the top picture in a ...
4
votes
2answers
522 views

Connecting Fiber interfaces on Cisco switches

I'm trying to replace an old Cisco Catalyst 2950 with a new Cisco 3750X. Unfortunately, these SFP's are so expensive, I'm trying to work with what I've got. Please note the diagram to see what ...
6
votes
3answers
413 views

Mixing SFP's with different speeds

I need to install new SFP's in a location; however, I need them to connect to existing switches and I'm not sure what SFP type they are. All I know is I've got MM Fiber. If I installed Cisco ...
1
vote
3answers
858 views

Fibre (Fiber) Optic - Mixing SFP's and Switches

My generic question is: Can you mix switches on the opposite sides of a fibre link, or more accurately different manufactuors tranceivers. We just bought several new HP ProCurve v1810 series switches ...
4
votes
1answer
529 views

1000 Mbit/s fiber switch to 100 Mbit/s fiber switch - no communication

This morning, I troubleshooted a fiber connection between two switches in the same building. It was a single-mode fiber. I knew this fiber was fine, because I had installed it myself and tested (with ...
6
votes
2answers
276 views

If fiber runs 1gig fine, are there any concerns when considering upgrading to 10gig transceivers?

We had fiber installed (connecting ~10 buildings) around 5 years ago and it has been working great. The initial setup involved Procurve 2848 and 2824 switches w/ 1gig transceivers. However, lately we ...
1
vote
2answers
145 views

Two companies, one internet connection

We're moving into a new building with two other tenants in the next few months and we'll be splitting the costs for a single fibre connection running 10 Mbps. The ISP will be providing a four IP's ...
1
vote
3answers
475 views

For a <1ft connection does an SFP mini GBIC with fiber provide any better performance than an cat 5e patch cable?

We have 7 switches in one rack that are all connected to each other via SFP mini GBIC fiber connections running at 1GBps. I know fiber provides benefits in terms of extending the distance that ...
1
vote
1answer
144 views

gigabit ethernet to single mode LC fiber

I need a fiber converter that takes single mode LC fiber from the patch to a gigabit port on the switch. I've been investigating the Canary GFT-1036, but am having a difficult time finding a vendor ...
0
votes
1answer
240 views

Do 3Com switches support generic SFPs?

I have a 4200 series switch with an empty sfp port, and existing unused fiber run (62.5nm multimode) to another building that I hope to bring up, with a 1000base-SX connection on the other end. ...
2
votes
2answers
301 views

Network not working properly - 3 computers working, 3 not working - what could it be?

So I've got this setup ... Fiber cable broadband connection -> Media Converter -> Switch (8 ports) -> PCs The network does not have DHCP, all settings are manual. 3 computers can connect to the ...
2
votes
1answer
2k views

Can i plug SFP Transceiver into SFP+ port?

I`m talking about DELL PowerConnect 6248 here. For Module 1 bay you can buy PowerConnect 6xxx SFP+ Module supports up to two SFPs (no SFPs included) Can i plug into these those Transceivers that are ...
2
votes
2answers
659 views

Upgrade Fiber Optics from 100Base-FX to 1000Base-SX

We currently have two HP Procurve 2312s connected using two 100-FX-SC transceivers. I am looking to upgrade to new managed Cisco Catalyst switches that use 1000Base-SX transceivers, will the same ...
0
votes
2answers
560 views

Problem with fiber and 3Com switch

I have a 3com 4200 switch with a fiber connection to the main server room. The link reports up on both ends, but the 4200 neither sends nor receives data on the connection. The end in the server ...