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trebor
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 How much is PRI
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
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 11-24-01 12:53 PM
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haseeb_eng
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Registered: Oct 2001
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11-24-01 02:16 PM
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trebor
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Thanks haseeb_eng. That math works out.
Funny no mention of that sync channel in th Sybex book or the Cisco Certification Guide.
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11-24-01 03:31 PM
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dmaftei
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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.
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11-26-01 01:21 AM
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haseeb_eng
Senior Member
M
Registered: Oct 2001
Location: Kuwait City
Country: Kuwait
State:
Certifications: CCNA, CCDA, CCNP, CCDP, CCSP, Content Networking, Wireless LAN Design Spec.
Working on: PMP CCIE (R&S) MBA
Total Posts: 1165
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11-26-01 05:30 AM
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