User's Manual
044-05156 Rev C 35
A front panel four-position rotary switch is provided to set the VSWR alarm threshold based on the length of cable
from DLNA output (typically FSJ4 or LDF4) to the antenna foam jumper (typically 1 5/8 Heliax). The switch position
is set with a jeweler’s screwdriver. As a general guide, set the switch as follows:
Alarm Thresholds (in dB; Return Loss)
DLNA
Number
Switch
Position
Design
Tolerance
(dB)
Internal
Cabinet
Cable Loss
External
Cabinet
Cable Loss
Alarm
State 1
Minor
Alarm
State 2
Major
Alarm
State 3
Critical
1 1 0.25 <0.75 6 +2 9.5 +2.5 12 +3
2 2 0.25 >0.75, <1.75 8 +2.25 11.5 +3 14 +3.5
3 3 0.25 >1.75, <2.75 10 +2.5 13.5 +3 16 +4
0
4 Test - - - - -
1 1 0.23 <0.77 6 +2 9.5 +2.5 12 +3
2 2 0.23 >0.77, <1.77 8 +2.25 11.5 +3 14 +3.5
3 3 0.23 >1.77, <2.77 10 +2.5 13.5 +3 16 +4
1
4 Test - - - - -
1 1 0.16 <0.84 6 +2 9.5 +2.5 12 +3
2 2 0.16 >0.84, <1.84 8 +2.25 11.5 +3 14 +3.5
3 3 0.16 >1.84, <2.84 10 +2.5 13.5 +3 16 +4
2
4 Test - - - - -
1 1 0.14 <0.86 6 +2 9.5 +2.5 12 +3
2 2 0.14 >0.86, <1.86 8 +2.25 11.5 +3 14 +3.5
3 3 0.14 >1.86, <2.86 10 +2.5 13.5 +3 16 +4
3
4 Test - - - - -
1 1 0.09 <0.91 6 +2 9.5 +2.5 12 +3
2 2 0.09 >0.91, <1.91 8 +2.25 11.5 +3 14 +3.5
3 3 0.09 >1.91, <2.91 10 +2.5 13.5 +3 16 +4
4
4 Test - - - - -
1 1 0.07 <0.93 6 +2 9.5 +2.5 12 +3
2 2 0.07 >0.93, <1.93 8 +2.25 11.5 +3 14 +3.5
3 3 0.07 >1.93, <2.93 10 +2.5 13.5 +3 16 +4
5
4 Test - - - - -
4.7.5 DLNA Interface
The DLNA employs a DB-15 connector to communicate via the SIM and receive input DC power. Communication is
accomplished using I
2
C with the BTS signaling.
The SIM knows whether or not all DLNAs are connected by a module detect circuit provided on each DLNA
(ground on pin 9).
J6 DB15 Pin Assignments
PIN Description PIN Description
1 27V 9 Detect
2 27V 10 Temp Out
3 Ground 11 (mfg test use only)
4 Ground 12 (mfg test use only)
5 Write Protect 13 SCL_N (RX)
6 SCL_P (RX) 14 SDA_TX_N
7 SDA_TX_P 15 SDA_RX_N
8 SDA_RX_P
Via I
2
C, the alarms can be read and an EEPROM can be both read and written too. The SIM however does read
the temp sensor on the DLNA. The DLNA has an RS-232 interface that is only used during test and is not wired out
to the SIM.