DK40 Universal Slot PCBs
RBSU/RBSS ISDN Basic Rate Interface Unit
3-56
Strata DK40 I&M Manual Spring 1999
Refer to the Strata DK40 Programming Manual or DK Library CD-Rom for more details.
Earthing Terminal Screws
TB3 is a screw terminal that can be used to connect an earth wire to the RBSU PCB (See
Figure 3-29 for the location). This earth enables the RBSU/RBSS to meet Electro Magnetic
Compatibility (EMC) requirements.
BRI Wire Type Recommendations
CAT5 wire is recommended for ISDN BRI customer-premises wiring. While the ISDN BRI
signal works for some distance over almost any wire that is suitable for analogue voice
service, better wire enables longer runs. CAT5 provides better 100-ohm impedance matching
(at little extra cost) between the RBSU/RBSS circuit and the station Terminal Equipment
(TE).
Normally the CAT5 wiring does not have to be shielded when used for ISDN BRI premises
wiring. However, the RJ-45 jacks on the RBSU/RBSS BRI circuits are shielded and provide
an earth shield in the event that shielded modular plugs and cable are used.
Note
If using shielded cable and plugs, cable runs should only be earthed at the DK
RBSU/RBSS, RJ-45 jack. To prevent earth loops, do not earth both ends of shielded
cable runs.
RBSU/RBSS BRI Cable Jacks and Connectors
The standard connector for ISDN equipment is the eight-pin RJ45 jack. Patch cables have
eight-pole plugs at both ends. The same pinout applies to both ends of an ISDN cable, which
is the practice of the data world.
A cord of up to 10 meters connects the ISDN BRI RJ-45 wall jack to the desktop TE-1 or TA
The standard pinouts for ISDN jacks is listed in Table 3-17.
Notes
◆ Pins are numbered left to right when looking into the jack cavity with the locking
tab. down.
Table 3-17 RJ-45 Jack – ISDN Standard Interface Modular Connector Pinout (RBSU-TE
mode)
Pin Color Name Function
1 Green T2 Power 3 (not used on DK RBSU/RBSS)
2 Green/White R2 Power 3 (not used on DK RBSU/RBSS)
3 Orange/White R3 Transmit to Network (NT-1, S/T jack)
4 Blue/White R1 Receive From Network (NT-1, S/T jack)
5 Blue T1 Receive From Network (NT-1, S/T jack)
6 Orange T3 Transmit to Network (NT-1, S/T jack))
7 Brown T4 - Power 2 (not used on DK RBSU/RBSS)
8 Brown/White R4 + Power 2 (not used on DK RBSU/RBSS)
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