EFJohnson 3000 SERIES - Manual (Page 71)

BASIC BOARD MODULE (BBM)
7-9
7.5.6 TEST "6"
This test is used in conjunction with Test "5" to
verify the correct operation of the main and secondary
PCMs. Use Test "1" and Test "8" to setup the cards.
This test is the same as Test "5" but transmits in
Slot 0 and receives in Slot 31.
7.5.7 TEST "7"
Closes the relays on the telephone line person-
ality card. This connects the telephone line and the
Silent Slot of the VTM Bus to the main transmit audio.
This test is conducted the same as Test "1" except
the System Alignment Tone is replaced with the Silent
Slot of the VTM PCM.
7.5.8 TEST "8"
Turns on the FSK and transmits the 1200 Hz tone.
1. The FSK is generated by U16, passes through level
op amp U32B.
•
Adjust R86 for a level of -12 dBm
±
0.5 dB at TP4.
2. The FSK then passes through transmission gate
U31C with less than 0.25 dB of loss. The control
line (U31C, pin 6) should be high ( > 8V).
3. The signal then passes to the balanced line driver op
amps U28A and U28B.
•
Adjust R44 for a level of -21 dBm
±
1 dB at J12.
•
The level should be -21 dBm
±
1 dB across the Tx
line.
7.5.9 TEST "9"
This allows the TIM-DID to answer an incoming
call and provide System Alignment Tone to the tele-
phone line. This allows the DID to have the hybrid
adjust circuit tuned.
This test is the same as Test "1". The exception
here is that the DID waits to answer the incoming call
and then sends the System Alignment Tone to the tele-
phone line.
7.6 DS1 DISPLAY DEFINITIONS
The following tables define the tasks performed
when displayed on DS1.
Table 7-4 DIM CARD DISPLAY/TASKS
DS1 TASK
0
1
2
3
4
5
6
7
8
9
A
A
B
C
D
E
F Initialization
Await Enable
Idle
Transmit
Receive
All Call
Connect PTT
Trunk Verification
Interrogate
Trunk Conversation
Facility Acquisition
Await Trunk
Trunk Destination Conversation
Ring Channel
Channel Conversation
Console Initialization
Standby
Table 7-5 CCM CARD DISPLAY TASKS
DS1 TASK
0
1
2
2*
3
3*
4
5
8
F Initialization
Await Enable
Idle
IDB Bus Access Error
Transmit
CSB Bus Access Error
Receive
Duplex
Suspend Audio
Standby
* With Red Alarm LED CR402 on