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| trebor 2001-11-24, 7:53 am |
| This is from Sybex but it says the same thing in my other reference materials.
"In North America and Japan, the ISDN Primary Rate Interface service delivers 23 64Kbps B channels and one 64Kbps D channel for a total bit rate of up to 1.544Mbps."
But 24 x 64 Kbps = 1.536 Mbps
Where did we get those extra 8 Kbps?
Trebor | |
| haseeb_eng 2001-11-24, 9:16 am |
| 23 B channels = speed is 64 k each
1 D channel = speed is 16 k
1 sync channel = speed is 56 k | |
| trebor 2001-11-24, 10:31 am |
| Thanks haseeb_eng. That math works out.
Funny no mention of that sync channel in th Sybex book or the Cisco Certification Guide. | |
| dmaftei 2001-11-25, 8:21 pm |
| quote:
Originally posted by trebor
That math works out.
It does, but with wrong inputs. The PRI D channel is 64 k (the BRI D channel is 16 k). That's 23 Bs and 1 D, each 64 k, for a total of 1536 k. The difference (8 k) is indeed used for synchronization. | |
| haseeb_eng 2001-11-26, 12:30 am |
| what can i say |
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