
ISDN Overview
114062 Rev. B 3-7
Figures 3-4 and 3-5 show two ISDN networks with functional groups and
reference points.
Figure 3-4. Reference Points and Functional Groups for Devices
Figure 3-5. Reference Points and Functional Groups for Non-ISDN
Devices
Digital line
SU
TE1 NT1
/T
Router with
ISDN/BRI
module
ISDN
DS0010A
Non-ISDN router
Digital line
U
NT1
TA
R
S/T
ISDN
DS0011A
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