CPU Module
4-13
LED Name Description Status
H1 LNK2
*
USB Host2 LNK (link)
Green LED
ON – A USB device is connected.
OFF – No link exists between the CPU and
the MotoTrbo radio.
PI1 TX Plug-in Port 1 – TX
(transmit)
Green LED
ON- Transmitting Data
PI1 RX Plug-in Port 1– RX (receive)
Green LED
ON – Receiving Data
PI1 CM Plug-in Port 1 – CM (channel
monitor)
Green LED
ON – Channel Busy (if port is in use by radio,
RS485, or RS232)
– Network Connected (if an IP plug-in is
used)
SI1 TX Serial Port 1 – TX (transmit)
Green LED
ON – Transmitting Data
SI1 RX Serial Port 1 – RX (receive)
Green LED
ON – Receiving Data
SI1 CM Serial Port 1 – CM (channel
monitor)
Green LED
ON – Channel Monitor is ON.
S2 TX Serial Port 2 – TX (transmit)
Green LED
ON – Transmitting Data
S2 RX Serial Port 2 – RX (receive)
Green LED
ON – Receiving Data
S2 CM Serial Port 2 – CM (channel
monitor)
Green LED
ON – Channel Monitor is ON
E1 LNK
**
Ethernet Port 1 (link)
Green LED
ON – Network Connected
In case of RAM test and startup failure, see
Table 4-2 and Table 4-3.
*
The LED names I1 ACTV, I1 L/RX, H1 LNK1/LNK2, and D1 RX appear only in CPU 3680.
**
The LED names E1 LNK and RX appear only in CPU 3640 and CPU 3680.
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