Aria-130 Digital Key Telephone System
Issue: 1.2
Installation Manual
117
3.5.7.2 STIB wiring
STIB is capable of connecting to 4 Basic Rate Trunk lines or Terminals through RJ45 type jacks. Each
line is switchable by hardware and software setting. (see clause 3.4.6.2)
The contact assignment of RJ45 type jack on STIB is shown in Figure 3.5.15.a.
The TX pair of RJ45 type jack on STIB is connected to the RX pair of NT1 or Terminal, and the RX one
on STIB/STIU is to the TX one of NT1 or terminal as Figure 3.5.15.b.
Terminating resistors should be required on each line to match line impedance. See clause 3.5.7.4.
Figure 3.5.15.a Contact assignment of RJ-45 Connectors of STIB
1 2 3 4 5 6 7 8
TX+
TX-
RX-
RX+
1 2 3 4 5 6 7 8
RX+
RX-
TX-
TX+
a. When a line is set to T interface
b. When a line is set to S interface
Note:
1. Connect the TX pair of RJ45 type jack on STIB to the RX pair of NT1 and
vice versa
. And connect
the TX pair of RJ45 type jack on STIB to a RX pair of ISDN terminal and
vice versa
.
2. Check terminating resistors. See clause 3.5.7.4.
3. SWx means selectable switches of S or T interface on each interface of STIB, see clause 3.4.6.2
4. STIB is capable of connecting to up to 4 lines/terminals.
Figure 3.5.15.b STI trunk line (T) or terminal connection (S) wiring
NT1 (NT-Box)
STIB
RJ45 type jack
TX+
TX-
RX+
RX-
3
6
4
5
3
6
4
5
RX+
RX-
TX+
TX-
From/to PX
ISDN Terminal
RX+
RX-
TX+
TX-
3
6
4
5
3
6
4
5
TX+
TX-
RX+
RX-
S
T
SWx
S T
SWx
OR
T interface
S interface
