Evaluation Kit User Manual for PIC Board

EV6000

© 1996 Consumer Microcircuits Limited

15

UM6000/3

cidcw

This demonstration covers both the BT and Bellcore off-hook caller ID services. The

CAS detection algorithm runs as detailed for cas but once the DTMF

acknowledgement is sent the FX602 is set to receive mode and the FSK data is

displayed in the form of these examples:

>80,02,01376-513833.01,03101415.11,01,.00,

1, 2, 3,

2, 3,

2, 3,

4.

where 1 is the Message type word

2 is the Parameter type word

3 is the Parameter characters or data

4 is the Result of the checksum

or in the following form:

>80,A parameter.00,

1, 2,

3.

where 1 is the Message type word

2 is the Message characters or data

3 is the Result of the checksum

On the EV6020 board, the line termination resistor R20 (

≈ 600Ω) should be fitted.

Note that this software does not present an off hook dc load to the line.

clip

This demonstration covers the BT on-hook service initiated by a line reversal. On the

EV6020 board, JP1 should be in position 2-3 for detection of a line reversal. The idle

condition is with the FX602 in zero power mode and with IRQN enabled. When a line

reversal is detected the FX602 is set to tone alert mode. Once the alert tone is

detected the FX602 is set to receive FSK data, which is displayed in the same way as

for cidcw.

On the EV6020 board, relay 2 is energised for 15ms during the silent period between

the alert tone and the FSK data. A resistor can be fitted in the R26 position to provide

a current wetting pulse. Relay 3 is energised during the FSK receive period.

Components can be fitted in positions R30, R36 and C10 to provide an ac termination

to the line.

cid

This demonstration covers the Bellcore on-hook service associated with ringing. On

the EV6020 board, JP1 should be in position 1-2 for detection of ringing. The idle

condition is with the FX602 in zero power mode and with IRQN enabled. A detect

pulse of duration < 500ms is assumed to be a line reversal and is ignored. When a

burst of ringing current is detected the FX602 is set to receive FSK data, which is

displayed in the same way as for cidcw.

On the EV6020 board, relay 3 is energised during the FSK receive period.

Components can be fitted in positions R30, R36 and C10 to provide an ac termination

to the line.

ntt

This demonstration covers the NTT on-hook service associated with ringing. On the

EV6020 board, JP1 should be in position 1-2 for detection of ringing. The idle

condition is with the FX602 in zero power mode and with IRQN enabled. A detect

pulse of duration < 500ms is assumed to be a line reversal and is ignored. When a

burst of ringing current is detected the FX602 is set to receive FSK data, which is

displayed in the form of the following example: