Motorola MTR2000 T5544 Instruction / Field Service Manual page 236

CLN1202 Station Backplane
Signal Name
GND
GPI_0 to GPI_15 (WCI)
GPO_0 to GPO_15 (WCO)
GPIO_0 and GPIO_1
Line 1+
Line 1–
Line 2+
Line 2–
Line 3+
Line 3–
Line 4+
Line 4–
MISO (Master In Slave Out)
MOSI (Master Out Slave In)
MRTI RX Audio
MRTI RX Carrier*
MRTI TX Audio
OP1 CS1*
OP1 CS2*
OP1 CS3*
OP1 CS4*
OP2 CS1*
OP2 CS2*
OP2 CS3*
Opt IRQ*
6
Table 2. Backplane Signal Descriptions (Continued)
Type
Power Station ground
General Purpose Inputs from external equipment (into the station at the System
Digital
connector, through the Auxiliary I/O board, to the SCM).
General Purpose Outputs to external equipment (from the SCM, through the
Digital
Auxiliary I/O board, to the System connector).
Digital General Purpose Inputs and Outputs, to and from the SCM.
4-wire Phone Line (differential) inputs for clear audio and 12 kbps coded data;
Analog 300 to 3400 Hz (clear), or 30 to 6000 Hz (coded); 600Ω typical impedance (coun-
try-specific)
2-wire Phone Line (differential) inputs/outputs or, 4-wire Phone Line outputs
Analog for clear audio and 12 kbps coded data; 300 to 3400 Hz (clear), or 30 to 6000 Hz
(coded); 600Ω typical impedance (country-specific)
Second Phone Line (differential) input pair for clear audio (8-wire WIB only);
Analog
300 to 3400 Hz; 600Ω typical impedance (country-specific)
Second Phone Line (differential) output pair for clear audio (8-wire WIB only);
Analog
300 to 3400 Hz; 600Ω typical impedance (country-specific)
Digital SPI data from Slave devices to Master (SCM); standard TTL
Digital SPI data from Master (SCM) to Slave devices; standard TTL
From SCM; Station clear audio signals (RX, Wireline TX, or Mic) bound for
landline via MRTI; MRTI accepts a 1.3 Vpp ±8 dB input level (MRTI has an
Analog
ALC)
From SCM to MRTI to indicate squelch status of station and control direction of
audio between SCM and MRTI for half-duplex patch modes (when signal is ac-
tive, MRTI PTT is forced inactive and MRTI TX Audio is muted); Active during
Digital clear/coded reception and coded Repeater hang time, but not clear Repeater
hang time; Also active for any PTT with higher priority than MRTI (i.e. normal-
ly active during Wireline PTT to force MRTI to mute MRTI TX Audio and in-
stead route WL TX Audio to landline; Active low (open-collector output)
To SCM; MRTI audio from landline to be transmitted by station, or routed to
WIB; Consists of subscriber signaling (i.e. selective signalling), call alert tones,
and regular voice audio; Audio levels: either 80 mV
Analog
15 mV to 0.5 V
rms
600Ω (used to set 60% FSD)
Digital From SCM to Option 1 module; SPI bus chip selects; TTL active low
Digital From SCM to Option 2 module; SPI bus chip selects; TTL active low
Digital Interrupt request to SCM from Option cards; TTL active low
Function/Signal Levels
into 600Ω; Nominal level is 165 mV
rms
to 2 V open circuit, or
rms rms
for '#' tone pair into
rms
68P81096E46-E
09/30/05