Motorola MTR2000 T5544 Instruction / Field Service Manual page 238

CLN1202 Station Backplane
Signal Name
Serial ID
SPI CLK
Trunk Duplex Enable*
Trunk /MRTI PTT*
Trunk Mute*
Trunk RX Audio
Trunk TX Data+
Trunk TX Data–
Trunk TX Inhibit*
TX Lock (WCO)
TX PL On/Off (WCI)
V Control
Voltage Forward
VSWR Fail*
Wireline 1/2 FSYNC
Wireline 1/2 RXD
Wireline 1/2 TXD
Wireline 3/4 FSYNC
Wireline 3/4 RXD
Wireline 3/4 TXD
Wireline BCLK
Wireline ID
8
Table 2. Backplane Signal Descriptions (Continued)
Type
Digital Serial ID data to SCM from backplane serial ID device
SCM SPI bus clock; Low-to-high transition shifts data; 310 KHz (minimum);
Digital
standard TTL
To SCM from TCC; active during full duplex phone calls to inhibit station re-
Digital
peat audio; TTL active low
To SCM from relay-closure (MRTI) or opto-isolated open-collector (TCC) to key
Digital
transmitter; Active low
Multi-purpose control signal to SCM from TCC; In some systems, active low
mutes the repeat audio path and active high unmutes the audio path; Or, used by
TCC to keep station out of failsoft by toggling this line periodically; Or, used to
Digital
request a fast unmute of the Connect Tone (PL) decoder by receipt of a 1.6 ms
pulse at start of voice calls; Driven by an opto-isolated open-collector with a Vc-
e of 1.0 V (maximum) @ a 2 mA load
sat
Buffered RX discriminator audio sent to TCC; For control channels, it contains
Inbound Signaling Words (ISW) (1.4 Vpp minimum, on a quiescent dc bias of
4.05 V ±1.5 Vdc); On voice channels, it contains connect and disconnect tones
Analog
(0.7 to 2.0 Vpp, on a quiescent dc bias of 5 V ±0.25 Vdc), and high-speed ac-
knowledge tones (2.5 to 6.0 Vpp, on a quiescent dc bias of 5 V ±0.25 Vdc)
Outbound TX modulation from TCC; Contains all trunking transmit data, in-
cluding 3600 bps control channel data (8.8 Vpp ±0.4 V, 0 Vdc) and 300 or
Analog
150 bps voice channel data (2.8 Vpp ±0.3 V, 0 Vdc)
Analog Trunking data signal ground
Digital To SCM; inhibits standby station; TTL active low
Digital Wild-Card Output indicates TX synthesizer is locked; TTL active high
Digital Wild-Card Input To SCM; disables TX PL/DPL modulation; TTL active high
Analog PA control voltage (P7 pin 4 only); 0 to 10 Vdc
DC voltage proportional to actual RF power output (P7 pin 1 only); 0 to 10 Vdc
Analog
(Goes nowhere)
Digital VSWR falure indicated by active low.
From SCM to WIB codec; 8 KHz frame sync clock initiates sampling of PCM
Codec
transmit data output
Codec PCM receive data from SCM to WIB; standard TTL
Codec PCM transmit data from WIB; standard TTL
From SCM to second WIB codec (8-wire WIB only); 8 KHz frame sync clock ini-
Codec
tiates sampling of PCM transmit data output
Codec PCM receive data to WIB (8-wire WIB only); standard TTL
Codec PCM transmit data from WIB (8-wire WIB only); standard TTL
From SCM to WIB codec; 256 KHz (average) bit clock serially shifts data into/
Codec
out of codec
Analog To SCM A/D from WIB; module ID determined by specific voltage; 0 to 5 Vdc
Function/Signal Levels
68P81096E46-E
09/30/05