TN857 CI-IP-ADAPTER-1 Telex IP-224 Ethernet Adapter
MT-4 Radio Systems
TECHNICAL NOTES
Page 3 of 6
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TN857, REV 2-0-0, © Oct 2018
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A female DB25 connector on the back of the subrack (J10) can also be used for basic base connections to a Telex
IP-224, using a straight-through male DB25 to male DC37 cable as follows:
CBLC40-DB0DC061 Interconnect cable, CI-IP-ADAPTER-1 (DB25 to DC37)
WARNING: JU108 must be confi gured correctly or damage can occur. JU108 B for Rx A COR / IP-224, as
shown in Figure 2.
Figure 2: Jumper positions for DB25 connector
On Subracks with a Serial Number less than 279213, it is required that 2 pins on the DB25 (PTT COM - pin 2 and
MON COM - pin 16) are wired to ground for proper operation. Pins can be soldered to to ground at the bottom
right of the circuit board on Control Module J1, pins D32 and Z32. On Subracks with a Serial Number greater than
279213, the two pins are connected to ground internally and are not available as a solder point on the circuit board.
No wiring is necessary.
Figure 3: DB25 connector ground pins
OLDER SUBRACK
Serial Number less than 279213
1245610
1115
16
18
1923
1
45610
111518
1923
NEWER SUBRACK
Serial Number greater than 279213
Pins 2 and 16 are soldered to ground Pins 2 and 16 are internally soldered to ground
and are not available on the circuit board
145610
111518
1923
JU108
B
A
JU104
B
A
JU105
B
A
JU106
B
A
JU107
B
A
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