On Saturday 15 May 2010 19:28:37 Jaap Winius wrote: > When configuring Asterisk with an ISDN card, it will at one point > become necessary to select the LBO (Line Build-Out) value. This is an > integer (0-7) that is determined by the length of the cable and is > selected from the following table. Many of us are familiar with it: > > CSU (dB) DSX-1 (feet) > ------------------------------- > 0 0 0?133 > 1 133?266 > 2 266?399 > 3 399?533 > 4 533?655 > 5 -7.5 > 6 -15 > 7 -22.5 > > The value selected should almost always be zero. However, if the cable > is of a significant length, another value must be selected, but which > one? There are two columns: CSU and DSX-1. When is it appropriate to > use the one or the other to determine the correct LBO value?
Each LBO value is a different amount of loss to be expected on the line, and therefore the signal is amplified a commensurate amount. What it really comes down to is what works for you. -- Tilghman Lesher Digium, Inc. | Senior Software Developer twitter: Corydon76 | IRC: Corydon76-dig (Freenode) Check us out at: www.digium.com & www.asterisk.org -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
