Installation guide

Terminal and Door Phone Models 5-8
Chapter 5: Terminal Connection and Wiring Method
MBX IP Hardware & Installation Guide
Connecting the SBX Phone
The SBX phone is connected to pins 2 and 5. A standard wall jack uses pins 3-4 (RD/GN) and
2-5 (YL/BK). NOTE -- systems like MBX and XTS use pins 3-4.
When you wire an SBX phone to an MBX system, you must insure that the digital pair (pins
1-26, 2-27) from the MBX digital station connector terminate on the YL/BK pair of the jack to
which the SBX phone is connected. NOTE -- XTS, STS and most other phones use the GN/RD
pair, not the YL/BK.
CONNECTOR PIN
NUMBER
RJ21
PIN
IP Phone
CONNECTOR
IP Phone
DESIGNATION
PORT
NO
REMARK
PAIR PIN
RJ21 14
39
14 14
39
VT-14
VR-14
14
15
40
15 15
40
VT-15
VR-15
15
16
41
16 16
41
VT-16
VR-16
16
17
42
17 17
42
VT-17
VR-17
17
18
43
18 18
43
VT-18
VR-18
18 -
19
44
19 19
44
VT-19
VR-19
19
20
45
20 20
45
VT-20
VR-20
20
21
46
21 21
46
VT-21
VR-21
21
22
47
22 22
47
VT-22
VR-22
22
23
48
23 23
48
VT-23
VR-23
23
24
49
24 24
49
VT-24
VR-24
24
CONNECTOR PIN NUMBER NO SIGNAL NAME
1n/a
2DKT-T
3, 4 Reserved
5DKT-R
6n/a
Release 1.7
April 2012