Date: Thu, 25 Feb 1999 22:04:22 -0800 From: "Kevin J. Rowett" <krowett@rowett.org> To: isp@FreeBSD.ORG Subject: Re: cdrom.com bandwidth limits Message-ID: <4.2.0.25.19990225215508.00973690@pop.ncal.verio.com> In-Reply-To: <199902260504.XAA02895@oldzoom.bga.com> References: <36D5AB69.FC915382@admin.us.net>
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At 09:04 PM 2/25/99 , Fred Gee wrote: >There are two things being discussed here, and they are different. > >First, the issue of HDLC 0-bit stuffing, the term used for inserting >1's where there is a run of 0's that will be difficult to detect. The HDLC bit stuffing is used for (bit) transparency. Frames start and end with an HDLC flag - a sequence of six ones in a row. If the transmitted data contains six ones in a row, then a zero is inserted in the bit stream so that it won't look like a flag and cause the frame to "end prematurely". >This does not affect bandwidth, and is done directly in the hardware Yes it does. The inserted zero is a real bit, and is transmitted across the signaling path. The amount of BW consumed by HDLC zero insertion depends upon the data. KR To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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