Rainbow Electronics DS21458 - Manual (Page 109)

DS21455/DS21458 Quad T1/E1/J1 Transceivers
109 of 270
18.1 Idle Code Programming Examples
The following example sets transmit channel 3 idle code to 7Eh:
Write IAAR = 02h
;select channel 3 in the array
Write PCICR = 7Eh ;set idle code to 7Eh
The following example sets transmit channels 3, 4, 5, and 6 idle code to 7Eh and enables transmission of
idle codes for those channels
:
Write IAAR = 02h
;select channel 3 in the array
Write PCICR = 7Eh ;set channel 3 idle code to 7Eh
Write PCICR = 7Eh ;set channel 4 idle code to 7Eh
Write PCICR = 7Eh ;set channel 5 idle code to 7Eh
Write PCICR = 7Eh ;set channel 6 idle code to 7Eh
Write TCICE1 = 3Ch ;enable transmission of idle codes for channels 3, 4, 5, and 6
The following example sets transmit channels 3, 4, 5, and 6 idle code to 7Eh, EEh, FFh, and 7Eh
respectively:
Write IAAR = 02h
Write PCICR = 7Eh
Write PCICR = EEh
Write PCICR = FFh
Write PCICR = 7Eh
The following example sets all transmit idle codes to 7Eh:
Write IAAR = 40h
Write PCICR = 7Eh
The following example sets all receive and transmit idle codes to 7Eh and enables idle code substitution
in all E1 transmit and receive channels:
Write IAAR = C0h ;enable block write to all transmit and receive positions in the array
Write PCICR = 7Eh ;7Eh is idle code
Write TCICE1 = FEh ;enable idle code substitution for transmit channels 2 through 8
;Although an idle code was programmed for channel 1 by the block write ;function above,
enabling it for channel 1 would step on the frame ;alignment, alarms, and Sa bits
Write TCICE2 = FFh ;enable idle code substitution for transmit channels 9 through 16
Write TCICE3 = FEh ;enable idle code substitution for transmit channels 18 through 24
;Although an idle code was programmed for channel 17 by the block write ;function above,
enabling it for channel 17 would step on the CAS frame ;alignment, and signaling information
Write TCICE4 = FFh ;enable idle code substitution for transmit channels 25 through 32
Write RCICE1 = FEh ;enable idle code substitution for receive channels 2 through 8
Write RCICE2 = FFh ;enable idle code substitution for receive channels 9 through 16
Write RCICE3 = FEh ;enable idle code substitution for receive channels 18 through 24
Write RCICE4 = FFh ;enable idle code substitution for receive channels 25 through 32