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Wendy
Guest
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 Posted:
Tue Nov 30, 2004 9:30 pm Post subject:
LLC maximum transmit value |
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According to IEEE 802.2 LLC spec, what is the maximum transmit value
for LLC flow control?
Many thanks in advance,
Rygel |
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Rich Seifert
Guest
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| Posted:
Wed Dec 01, 2004 12:18 am Post subject:
Re: LLC maximum transmit value |
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In article <d5db4614.0411300830.3fcc127a@posting.google.com>,
rygel_16@hotmail.com (Wendy) wrote:
| Quote: | According to IEEE 802.2 LLC spec, what is the maximum transmit value
for LLC flow control?
Many thanks in advance,
Rygel
|
LLC-2 provides seven bits for the frame sequence number, thus there can
be a maximum of (2^7 - 1) = 127 outstanding, unacknowledged frames. The
"sliding window" is used for both flow and error control.
Note that this applies ONLY to LLC Type 2, which is not commonly used
(at least not on Ethernet). LLC Type 1 provides no flow control at all.
--
Rich Seifert Networks and Communications Consulting
21885 Bear Creek Way
(408) 395-5700 Los Gatos, CA 95033
(408) 228-0803 FAX
Send replies to: usenet at richseifert dot com |
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Wendy
Guest
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| Posted:
Wed Dec 01, 2004 3:03 am Post subject:
Re: LLC maximum transmit value |
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Interesting!
Boson test exams believe it to be 255, whilst TestKing believe it to be 1023!
Go figure!
Rygel
Rich Seifert <usenet@richseifert.com.invalid> wrote in message news:<usenet-EAC710.11183330112004@news.isp.giganews.com>...
| Quote: | In article <d5db4614.0411300830.3fcc127a@posting.google.com>,
rygel_16@hotmail.com (Wendy) wrote:
According to IEEE 802.2 LLC spec, what is the maximum transmit value
for LLC flow control?
Many thanks in advance,
Rygel
LLC-2 provides seven bits for the frame sequence number, thus there can
be a maximum of (2^7 - 1) = 127 outstanding, unacknowledged frames. The
"sliding window" is used for both flow and error control.
Note that this applies ONLY to LLC Type 2, which is not commonly used
(at least not on Ethernet). LLC Type 1 provides no flow control at all. |
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