Ascotel IntelliGate 2025/2045/2065
Part 4 Connecting the PBX 749
The max. length of an AD2 connection via secondary, tertiary and patch cables
must not exceed 100 m in compliance with UGV guidelines. Both patch cables
together can be a max. 10 m.
S-bus crossover
On the S-bus user-network interface the pairs c/d and e/f are wired in a different
sequence on an RJ45 connector than on the UBC / ISDN network side.
Observe the following installation rules:
• Always terminate the bus extremity with 2 x 100 Ω (0.25 W, 5%)!
• Carry out the necessary crossover on the subscriber side of the PBX.
• If the subscriber cabling is integrated into the installation of a universal building
cable installation (UBC), cross over the S bus as shown in Fig. 4.34.
Fig. 4.34: S-bus crossover in the universal building cable installation
NT
f
3
4
5
6
c
d
e
f
TS
cde fcde
RJ45
UBC / ISDN network cabling S-bus cabling
RJ45 TerminalUBC UBCPBX
c
3
4
5
6
f
e
d
f
c
d
e
c
f
e
d
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