December 2001
Intermediate to advanced
656 pages
27h 19m
English
Content preview from Networking Explained, 2nd Edition
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Chapter 12: Frame Relay 403
that are capable of supporting real-time video. Once again, attention needs to be paid to
adequate bandwidth and CIRs. (See Chapter 17 for additional information about conver-
gence technologies.)
30. How does frame relay compare to SMDS or ATM?
During the late 1980s to early to mid-1990s, frame relay, SMDS, ATM, and broadband
ISDN (B-ISDN) were all in the spotlight as new fast packet-switching technologies or ser-
vices. Frame relay, which originally was a subset of ISDN, was defined initially to trans-
mit data at rates ranging from 56 kbps to T1/E-1. It was considered an interim technology,
Router
PBX
LAN 3
LAN 1
PBX
LAN
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