Re: How does one decipher switch back plane numers....
Hello people I think I found my answer... I had a hard time.. PhewPlease correct me If I'm wrong... I thought I'd share it with those that would like to know. switches being advertised saying (10gb backplane, 1Gb backplane, e.t.c.) Q) What does this number actually mean? A) This is a number that specifies the vendor's specification for maximum bandwidth processing capability. So for example a switch is being advertised as 1.5gb backplane... and it has 10 ports and each port can run at 100mb/sec. The calcuation will equal to 100 * 10 = 1Gb/sec . As u can see the backplane is not going to be congested as the max is 1.5Gb/sec and the maximum traffic load is 1Gb/sec. Q) How do they come up with this figure? A) I STILL DONT KNOW... Q) What do they mean by active backplane and passive backplane and which is better? A) Backplanes are often described as being either active or passive. Active backplanes contain, in addition to the sockets, logical circuitry that performs computing functions. In contrast, passive backplanes contain almost no computing circuitry. Passive backplanes are better becuase it makes easier to repair faulty components and to upgrade to new components. So for example, if a module on a switch gets ruined, you only need to change the module, not the entire switch. ""Santosh Koshy"" <[EMAIL PROTECTED]> wrote in message 9643av$6n4$[EMAIL PROTECTED]">news:9643av$6n4$[EMAIL PROTECTED]... > I have seen switches being advertised saying (10gb backplane, 1Gb backplane, > e.t.c.) > > Q) What does this number actually mean? > > Q) How do they come up with this figue? > > Q) What do they mean by active backplane and passive backplane and which is > better? > > Thanks, > Santosh Koshy > > > > > _ > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: How does one decipher switch back plane numers....
Q) How do they come up with this figure? Really what this is in reference to is the switching fabric. Many times you hear it reffered to as backplane capacity. The switching fabric is the shared highway that all bits traverse to get from one port to the next. The size of the switching fabric is defined by its width in bits times the speed in MHZ that it transmits those bits. For example: The Catalyst 6000 has a fabric that is 256 bits wide operating at 62.5 MHz/sec. 256 X 62.5 MHz = 16 Gbps. This is half duplex so the actual calculation would be a 32 Gbps data highway. -Original Message- From: Santosh Koshy [mailto:[EMAIL PROTECTED]] Sent: Monday, February 12, 2001 11:42 AM To: [EMAIL PROTECTED] Subject: Re: How does one decipher switch back plane numers Hello people I think I found my answer... I had a hard time.. PhewPlease correct me If I'm wrong... I thought I'd share it with those that would like to know. switches being advertised saying (10gb backplane, 1Gb backplane, e.t.c.) Q) What does this number actually mean? A) This is a number that specifies the vendor's specification for maximum bandwidth processing capability. So for example a switch is being advertised as 1.5gb backplane... and it has 10 ports and each port can run at 100mb/sec. The calcuation will equal to 100 * 10 = 1Gb/sec . As u can see the backplane is not going to be congested as the max is 1.5Gb/sec and the maximum traffic load is 1Gb/sec. Q) How do they come up with this figure? A) I STILL DONT KNOW... Q) What do they mean by active backplane and passive backplane and which is better? A) Backplanes are often described as being either active or passive. Active backplanes contain, in addition to the sockets, logical circuitry that performs computing functions. In contrast, passive backplanes contain almost no computing circuitry. Passive backplanes are better becuase it makes easier to repair faulty components and to upgrade to new components. So for example, if a module on a switch gets ruined, you only need to change the module, not the entire switch. ""Santosh Koshy"" <[EMAIL PROTECTED]> wrote in message 9643av$6n4$[EMAIL PROTECTED]">news:9643av$6n4$[EMAIL PROTECTED]... > I have seen switches being advertised saying (10gb backplane, 1Gb backplane, > e.t.c.) > > Q) What does this number actually mean? > > Q) How do they come up with this figue? > > Q) What do they mean by active backplane and passive backplane and which is > better? > > Thanks, > Santosh Koshy > > > > > _ > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: How does one decipher switch back plane numers....
Hi, --- Fears Michael S SSgt 18 CS/SCBT <[EMAIL PROTECTED]> wrote: > Q) How do they come up with this figure? > > Really what this is in reference to is the switching fabric. Many > times you > hear it reffered to as backplane capacity. The switching fabric is > the > shared highway that all bits traverse to get from one port to the > next. The > size of the switching fabric is defined by its width in bits times > the speed > in MHZ that it transmits those bits. For example: > > The Catalyst 6000 has a fabric that is 256 bits wide operating at > 62.5 > MHz/sec. 256 X 62.5 MHz = 16 Gbps. Can you explain this to me in greater detail? 256 bits * 62.5 MHz = 16,000(bits*MHz) 16,000(bits*MHz) * 1,000,000 Hz/MHz = 16,000,000,000 (bits*Hz) or 16 Gb*Hz 1 Hz = 1 Cycle/sec Therefore, 16 Gb*Cycles/sec or (dropping "cycles") 16 Gb/sec IOW, 16 Gbps What would totally clarify for me is if 1 bit is transmitted per Hz (per cycle)? Is that always the case? __END__ TIA, anthony __ Do You Yahoo!? Get personalized email addresses from Yahoo! Mail - only $35 a year! http://personal.mail.yahoo.com/ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: How does one decipher switch back plane numers....
Actually, it would be 256bits/cycle at a rate of 62,500,000 cycles/sec. "anthony kim" <[EMAIL PROTECTED]> wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > Hi, > > Can you explain this to me in greater detail? > 256 bits * 62.5 MHz = 16,000(bits*MHz) > > 16,000(bits*MHz) * 1,000,000 Hz/MHz = > 16,000,000,000 (bits*Hz) or 16 Gb*Hz > > 1 Hz = 1 Cycle/sec > > Therefore, > > 16 Gb*Cycles/sec or (dropping "cycles") 16 Gb/sec IOW, 16 Gbps > > What would totally clarify for me is if > 1 bit is transmitted per Hz (per cycle)? > > Is that always the case? > > > __END__ > > TIA, > anthony > > __ > Do You Yahoo!? > Get personalized email addresses from Yahoo! Mail - only $35 > a year! http://personal.mail.yahoo.com/ > > _ > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: How does one decipher switch back plane numers....
Now that makes sense. Thank you. --- Larry Lamb <[EMAIL PROTECTED]> wrote: > Actually, it would be 256bits/cycle at a rate of 62,500,000 > cycles/sec. > > "anthony kim" <[EMAIL PROTECTED]> wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > Hi, > > > > Can you explain this to me in greater detail? > > 256 bits * 62.5 MHz = 16,000(bits*MHz) > > > > 16,000(bits*MHz) * 1,000,000 Hz/MHz = > > 16,000,000,000 (bits*Hz) or 16 Gb*Hz > > > > 1 Hz = 1 Cycle/sec > > > > Therefore, > > > > 16 Gb*Cycles/sec or (dropping "cycles") 16 Gb/sec IOW, 16 Gbps > > > > What would totally clarify for me is if > > 1 bit is transmitted per Hz (per cycle)? > > > > Is that always the case? > > > > > > __END__ > > > > TIA, > > anthony > > > > __ > > Do You Yahoo!? > > Get personalized email addresses from Yahoo! Mail - only $35 > > a year! http://personal.mail.yahoo.com/ > > > > _ > > FAQ, list archives, and subscription info: > http://www.groupstudy.com/list/cisco.html > > Report misconduct and Nondisclosure violations to > [EMAIL PROTECTED] > > > > > _ > FAQ, list archives, and subscription info: > http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] __ Do You Yahoo!? Get personalized email addresses from Yahoo! Mail - only $35 a year! http://personal.mail.yahoo.com/ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
