Motorola MTR2000 T5544 Instruction / Field Service Manual page 237

Signal Name
Option1 ID
Option2 ID
PA A/D CS*
PA D/A CS*
PA Enable*
PA Fail (WCO)
PA Reset*
Patch Inhibit* or RSTAT
PL Detect Switch (WCO)
PL Strip* or CCI
Ptemp+
Raw WL TX Audio
Rdstat-R2 Control
Repeater ON/OFF (WCI)
Reset*
RF Relay Control In
RF Relay Control Out
RSSI
RX Inhibit-R2 Status
RX Lock (WCO)
RX PL Override (WCI)
SCI RX Option1
SCI RX Option2
SCI TX Option1
SCI TX Option2
SpectraTac Enc Disable (WCI)
68P81096E46-E
09/30/05
Table 2. Backplane Signal Descriptions (Continued)
Type
Analog Option 1 ID to SCM A/D; module ID determined by specific voltage; 0 to 5 Vdc
Analog Option 2 ID to SCM A/D; module ID determined by specific voltage; 0 to 5 Vdc
Digital From SCM; during SPI signalling, selects A/D converter in PA; TTL active low
Digital From SCM; during SPI signalling, selects D/A converter in PA; TTL active low
Digital From SCM; controls final module bias in low power PAs; TTL active low
Digital Auxiliary I/O board output indicates a PA failure; active high
Digital Resets D/A converter in PA; TTL active low (not used)
From SCM to MRTI to inhibit phone patch; Open-collector output (active low);
While active, MRTI will not receive or place any calls
Digital
From SCM to TCC to indicate receiver status; Open-collector output to opto-
isolated input in TCC; Low when receiver is squelched, high when receiver is
unsquelched
Digital Wild-Card Output active when PL/DPL present; TTL active high
Relay-closure input from MRTI to SCM (PL Strip*); Active low inhibits station
TX PL; Typically used when MRTI transmits signalling information
Digital
Logic input from TCC to provide Control Channel Indicate (CCI); Voice
channel = high; Control channel = low; Driven by an opto-isolated open-
collector with a Vce
Analog Input to SCM from peripheral temperature sensing device on circulator
Analog Wideband (coded) TX audio to SCM; 5 Vdc maximum level (if clipped)
Digital From SCM to control second receiver; TTL active high
Digital Wild-Card Input controls audio routing and repeater keyup; TTL
Digital System reset from SCM; TTL active low
Digital From SCM to control external RF relay driver; TTL active high
Relay From Auxiliary I/O to System connector to control external RF relay driver;
TTL active high
Closure
From SCM; DC voltage proportional to the receive RF signal strength; 0 to
Analog
5 Vdc
Digital To SCM from second receiver to inhibit receiver audio to WIB
Digital Wild-Card Output indicates RX synthesizer is locked; TTL active high
Digital Wild-Card Input disables PL gating qualifier; TTL active high
Digital To SCM from Option 1 card; for interprocessor communications; standard TTL
Digital To SCM from Option 2 card; for interprocessor communications; standard TTL
Digital From SCM to Option 1 card; for interprocessor communications; standard TTL
Digital From SCM to Option 2 card; for interprocessor communications; standard TTL
Digital Wild-Card Input to disable SpectraTac status tone; TTL active high
Function/Signal Levels
of 1.0 V (maximum) @ a 2 mA load
sat
CLN1202 Station Backplane
7