Main Processing Board 4-8
Chapter 4: Board Installation
MBX IP Hardware & Installation Guide
DSIU (Digital and Single Line Interface Unit)
The DSIU is included by default on the MPB100/300, and provides 6 Digital Terminal (DKT)
ports and 6 Single Line analog (SLT) ports with FSK (ITU-T V.23 or Bell 202) or DTMF (ITU-T
Q.23) Caller ID function. The 6 SLT ports support the Message Wait Indication, DTMF or Pulse
Dial receive, Polarity reversal, sinusoidal ringing generator, -48V DC feeding voltage, 20mA
Current Limitation and GR-909 Line Testing. The connection between the DSIU and terminal is
connected through RJ21 Modular Jacks.
NOTE:
• Caller ID signal can be either DTMF or FSK based on the country code entered in
the system database.
• Dialing Type (DTMF or DP) and Message Wait Indication (MWI) function is
determined by the selected admin value.
Pin Assignment, MJ1 (DKT Only)
CONNECTOR PIN
NUMBER
RJ21
PIN
DTIB12/24C
CONNECTOR
DTIB12/24C
DESIGNATION
PORT
NO
REMARK
PAIR PIN
RJ21 1
26
1 1
26
VT-1
VR-1
1 BL:BLUE
BK:BLACK
BN:BROWN
OR:ORANGE
WH:WHITE
GN:GREEN
SL: SILVER
VI:VIOLET
RD:RED
YL:YELLOW
2
27
2 2
27
VT-2
VR-2
2
3
28
3 3
28
VT-3
VR-3
3
4
29
4 4
29
VT-4
VR-4
4
5
30
5 5
30
VT-5
VR-5
5
6
31
6 6
31
VT-6
VR-6
6
7
32
77
32
VT-7
VR-7
7
8
33
88
33
VT-8
VR-8
8
9
34
99
34
VT-9
VR-9
9
10
35
10 10
35
VT-10
VR-10
10
11
36
11 11
36
VT-11
VR-11
11
Comments to this Manuals