ISDN Interfaces
5-6
Strata CTX I&M September 2002
Cabling
To meet Part 15 of EU Rules, ISDN PRI equipment must be connected using CAT5, Shielded Twisted-
Pair (STP) cabling between the NTE and the RPTU. CAT5 STP protects against cross talk, Radio
Frequency Interference (RFI), and/or Electro Magnetic Interference (EMI). STP protects ISDN signal
data while being transmitted through the cable and keeps the cable itself from emitting EMI and RFI.
Important!
To avoid ground loops, connect only the RPTU end of the shielded cable to earth. The
NTE earth should not be connected to the cable shield.
A detailed pinout diagram for the RJ45 jacks and the modular cords/adaptors is shown in Figure 5-4
below.
Toshiba will ship a 5 metre (16.5ft) shielded patch cord terminated with BS EN28877 connectors with
each RPTUIF.
Cable Installation
The RPTU PCB is shipped with a Toshiba RPRI cable kit for connection of the RPTU to a CSU. Install
the kit as shown in Figure 5-5.
Figure 5-4 Detailed Pinouts for ISDN PRI Cabling
RJ45 Contact No. TE
1RX
2RX
3Shield
4TX
5TX
6Shield
7 Not Used
8 Not Used
ISDN PRI
Network
Jack
RPTU
2752 CT I&M
A
D
E
RJ45
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