Freecom Technologies MusicPal 119, MAC Addresses and Address Resolution Protocol, Cable Quality

Page 119

Appendix

 

MAC Addresses and Address Resolution Protocol

 

An IP address alone cannot be used to deliver data from one LAN device to another.

 

To send data between LAN devices, you must convert the IP address of the destination

 

device to its media access control (MAC) address. Each device on an Ethernet network

 

has a unique MAC address, which is a 48-bit number assigned to each device by the

 

manufacturer. The technique that associates the IP address with a MAC address is known

 

as address resolution. Internet Protocol uses the Address Resolution Protocol (ARP) to

 

resolve MAC addresses. If a device sends data to another station on the network and the

 

destination MAC address is not yet recorded, ARP is used. An ARP request is broadcast

 

onto the network. All stations on the network receive and read the request. The desti-

 

nation IP address for the chosen station is included as part of the message so that only

 

the station with this IP address responds to the ARP request. All other stations discard

 

the request.

EN

The station with the correct IP address responds with its own MAC address directly to

 

the sending device. The receiving station provides the transmitting station with the

 

required destination MAC address. The IP address data and MAC address data for each

 

station are held in an ARP table. The next time data is sent, the address can be obtained

 

from the address information in the table.

 

Ethernet Cabling

 

There are two different types of cabling for Ethernet networks. Originally they used

 

thick or thin coaxial cable, but most installations currently use unshielded twisted

 

pair (UTP) cabling. The UTP cable contains eight conductors, arranged in four twisted

 

pairs, and terminated with an RJ45 type connector. There are 2 types of RJ-45 cables

 

available today, the Media Dependent Interface (MDI) cable and the Media Dependent

 

Interface - Crossover (MDI-X) cable. The first cable is used to connect routers to PCs and

 

the second to connect PCs directly to PCs. The sent and receive wires are switched from

 

beginning to end in the crossover cables. Some Ethernet switch products, such as the

 

MusicPal, are able to sense the polarity of a connection and automatically adapt to the

 

proper cabling type.

 

Cable Quality

 

A twisted pair Ethernet network operating at 10 Mbits/second (10BASE-T) will often

 

tolerate low quality cables, but at 100 Mbits/second (10BASE-Tx) the cable must be rated

 

as Category 5, or "Cat 5", by the Electronic Industry Association (EIA). This rating will be

 

printed on the cable jacket. A Category 5 cable will meet specified requirements regard-

 

ing loss and crosstalk. In addition, there are restrictions on maximum cable length for

 

both 10 and 100 Mbits/second networks.

 

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Contents Musicpal Dear User Freecom Technologies GmbH Germany Package ContentsChapter Appendix Freecom on the Internet Trademark Technical SupportHardware requirements System requirementsNetwork requirements Software requirementsCompatible streaming formats CompatibilityCompatible play-list formats Compatible file formatsAdvantages of the Freecom MusicPal Safety precautionsHardware features Software featuresHardware LAN Connecting / Installing the Freecom MusicPal Hardware Wlan Freecom MusicPal Connecting / Installing the Freecom MusicPal .1.1 Freecom MusicPal Front Side Chapter  Getting to know the Freecom MusicPal.1. Freecom MusicPal Rear Side Getting to know the Freecom MusicPalOverview Freecom MusicPal FunctionsOverview of Extras Overview of Internet RadioWlan IP LAN IP Overview of SettingsOptions Now PlayingSelect Add to favorites FavoritesSelect the category you want Internet RadioMedia server UPnP Extras Select Use Sleep Timer? Yes SettingsSleep Timer Wake-Up Timer Select Use NTP-Server? Yes Snooze Timer snooze functionClock Select which time zone you are Manual configuration of date and timeSelect Use NTP-Server? No Show Clock Idle Time RSS Feed Select between Use ‘Now Playing’ in clock? Yes or No Use ´Now Playing´Show Clock Edit Favorites Wlan Access Point Menu Select Access Point, select Hidden Access Point Connecting with hidden Wlan Access PointsSelect Wlan Region Wlan RegionSelect Use DHCP? Yes Using DhcpSelect Extras Settings Extras Settings RSS FeedsSelect RSS Feeds Calling an RSS FeedHtml Browser Select Extras SettingsSelect Html Browser Calling an Html BrowserWeather Calling the Weather Stock Quotes Select Stock Quotes Calling for Stock QuotesWorld Clock Select World Clock Calling the World ClockCalendar Select Calendar Calling the CalendarSelect Use DHCP? No Manual configuration of the IP address LAN IP/WLAN IPSound Play Mode Bass Boost Output Select the Line-out Boost menu item Line-out BoostStartup Sound Display Brightness Active Brightness Sleep Timer Brightness Sleeping Language Name Check for Updates Information Freecom Network Storage Assistant PC/Mac Features of the Freecom Network Storage Assistant PCStart recovery procedure Accessing your MusicPal web interfaceRepeat search for available Freecom MusicPal Login Name Admin Password . Features of the Freecom Network Storage Assistant Mac.. Web interface of your Freecom Network Storage device ..1 Configure basic settings of your Freecom MusicPalConfiguring the Freecom MusicPal through the Web Interface How do I access the configuration menu?  Now Playing Settings Click Automatically synchronise with an Internet time server Manual configuration of time and date RSS Feed Use ´Now Playing´ Edit Favorites Wlan Access Point Click Dhcp Client Manual configuration of the IP address LAN IP/WLAN IP Settings Extras Html Browser Calling an Html Browser Weather Calling the Weather Calling for Stock Quotes World Clock Select Calendar Sound Play Mode Output Startup Sound Display Brightness Active Brightness Sleeping Language Check for Updates Update Firmware AdministrationChange password What do I need what for? Freecom MusicPal in practical usage1 LAN Media server UPnP in connection with the Freecom MusicPalWlan Direct connection Connecting the Freecom MusicPalConnecting through a router 100 Configuring the Freecom MusicPal101 Configuring the computerSubsequent window double-click Internet protocol TCP/IP 102103 104 How can I Iisten to Internet Radio? Using your Mac as media server UPnPHow can I update my firmware? 105106 Registration VTuner Premium Internet Radio Service107 108 109 110 Administration of the Favorites111 112 113 Class B Domain Name ServerInternet address classes Class aSubnet Addressing 115Netmask 116 IP address shortage 117Hosting a server Multiple internal but only one external IP addressNetwork Address Translation Cable Quality MAC Addresses and Address Resolution Protocol119 Ethernet CablingConditions Your Guarantee
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