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RBSU/RBSS Interface Units
7-26 Strata CTX I&M 06/04
RBSU/RBSS Passive Bus Configurations
The placement of S-type TE and TA devices on the BRI S-passive bus is critical for good RBSU/
RBSS BRI circuit performance. Figures 7-19~7-22 show four passive bus architectures that are
known to work. In all installations, follow the guidelines of any of these passive-bus models using
the wire, cables, and jacks described in the previous paragraphs.
Figure 7-19 Simplified Short-branched Passive Bus
Figure 7-20 Branched Passive Bus
Figure 7-21 Extended Passive Bus
RJ45
360' max
5435
360' max
TA and PC Com Port
ISDN Telephone
RBSU/RBSS
NT-Mode
TR
RJ45
5436
*
*
850'
No more than 130' difference
between any 2 branches.
*
RBSU/RBSS
NT-Mode
TR
RJ45 with
TRs
TE-1 PC Card
ISDN Telephone
5437
TR
1650'
82'
RJ45
RBSU/RBSS
NT-Mode
TR
ISDN Telephone TE-1 PC Card