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Si2400
18 Rev. 1.3
5.5. Parallel Phone Detection
The Si2400 has the ability to detect a phone or other
device that is off hook on a shared line. This enables the
ISOmodem to avoid interrupting a call in progress on a
shared line and to intelligently handle an interruption by
another device when the Si2400 is using the line. An
automatic algorithm to detect parallel phone intrusion
(defined as an off-hook parallel handset) is provided by
default.
5.5.1. On-Hook Intrusion Detection
To implement intrusion detection, the Si2400 uses loop
voltage sense register SDB (LVCS). When on hook,
LVCS monitors the line voltage. (When off-hook, it
measures line current.) LVCS has a full scale of 87 V
with an LSB of 2.75 V. The first code (0 → 1) is skewed
such that a 0 indicates that the line voltage is < 3.0 V.
The voltage accuracy of LVCS is ±20%. The user can
read these bits directly when on hook through register
SDB (LVCS).
The automatic on-hook detector algorithm can be
tripped by either an absolute level or by a voltage
differential by selecting S13[3] (ONHD) = 0
b
for
absolute or S13[3] (ONHD) = 1
b
for differential. If the
absolute detector is chosen, the Si2400 algorithm will
detect an intrusion if LVCS is less than the value stored
in on-hook intrusion threshold, S11[4:0] (AVL). In other
words, an intrusion has occurred if LVCS < AVL.
AVL defaults to 1000
b
, or 25 V on powerup. The
absolute detector is the correct method to use for most
countries and should also be used to detect the
presence (or absence) of a line connection.
Under the condition of a very short line and a current-
limiting telephone off hook, the off-hook line voltage can
be as high as 40 V. The minimum on-hook voltage may
not be much greater. This condition can occur on phone
lines with current-limiting specifications such as France.
For these lines, a differential detector is more
appropriate.
The differential detector method checks line status
every 26.66 ms. The detector compares (LVCS (t –
0.02666) – LVCS (t)) to the differential threshold level
set in register S11[7:5] (DVL). The default for DVL is
0x02 (5.5 V). If the threshold is exceeded (LVCS (t –
0.02666) – LVCS (t) > DVL), an intrusion is detected. If
(LVCS (t) – LVCS (t – 0.02666) > DVL), then the
intrusion is said to have terminated.
Figure 7. Loop Voltage—LVCS Transfer Function
0 3 6 9 12151821242830333639 4245475154576063666972 100
0
5
75 78 81 84 87
LVCS
BITS
Loop Voltage (V)
10
15
20
25
30
- Features 1
- Applications 1
- Description 1
- Functional Block Diagram 1
- 2 Rev. 1.3 2
- TABLE OF CONTENTS 3
- 1. Electrical Specifications 4
- Table 2. Loop Characteristics 5
- Table 3. DC Characteristics 6
- Table 4. DC Characteristics 6
- Table 5. AC Characteristics 7
- for K-Grade, T 8
- –40 to 85°C for B-Grade) 8
- = –40 to 85°C for B-Grade) 9
- 10 Rev. 1.3 10
- 3. Bill of Materials 11
- 12 Rev. 1.3 12
- 4. Analog Input/Output 13
- 5. Functional Description 14
- 5.1. Digital Interface 15
- 16 Rev. 1.3 16
- 5.3. Low Power Modes 17
- 5.4. Global DAA Operation 17
- 18 Rev. 1.3 18
- Rev. 1.3 19 19
- 20 Rev. 1.3 20
- 5.6. Loop Current Detection 21
- 5.7. Carrier Detect/Loss 21
- 5.8. Overcurrent Detection 21
- 5.11. PCM Data Mode 23
- Figure 10. Signal Routing 24
- 5.12. Analog Codec 25
- 5.14. V.42 HDLC Mode 26
- 5.15. Fast Connect 27
- Table 16. MCKR Configurations 28
- 6.1. Command Line Execution 29
- 30 Rev. 1.3 30
- 6.4. S-Register Control 31
- 32 Rev. 1.3 32
- 6.5.4. A1 34
- 6.5.5. !2 34
- 6.5.6. !7 34
- Table 19. !7 Parameters 35
- Figure 12. !7 Security Timing 36
- Progress 37
- S19 S1A S1B S16 S17 S18 38
- Table 23. DTMF 39
- 7.1. DSP Registers 40
- SE8 SE6 SE5 41
- DSP Reg. Addr 41
- 7.2. Call Progress Filters 42
- 8. S Registers 43
- 44 Rev. 1.3 44
- Rev. 1.3 45 45
- 46 Rev. 1.3 46
- Rev. 1.3 47 47
- 50 Rev. 1.3 50
- Rev. 1.3 51 51
- 52 Rev. 1.3 52
- Rev. 1.3 53 53
- 54 Rev. 1.3 54
- Rev. 1.3 55 55
- 56 Rev. 1.3 56
- 58 Rev. 1.3 58
- Kissoff Tone Detect Length) 58
- Rev. 1.3 59 59
- 60 Rev. 1.3 60
- Rev. 1.3 61 61
- 62 Rev. 1.3 62
- Rev. 1.3 63 63
- Rev. 1.3 65 65
- 66 Rev. 1.3 66
- Rev. 1.3 69 69
- 70 Rev. 1.3 70
- Rev. 1.3 71 71
- 72 Rev. 1.3 72
- Rev. 1.3 73 73
- 74 Rev. 1.3 74
- Rev. 1.3 75 75
- 76 Rev. 1.3 76
- Rev. 1.3 77 77
- DAA Isolation Barrier 78
- Emissions/Immunity 78
- DC Termination 79
- AC Termination 80
- Ringer Impedance 80
- DTMF Dialing 80
- Pulse Dialing 80
- Billing Tone Detection 80
- Symbol Value 81
- In-Circuit Testing 82
- Compliance Test Commands 83
- Introduction 84
- APPENDIX C—UL1950 3RD EDITION 85
- 9. Pin Descriptions: Si2400 86
- Rev. 1.3 87 87
- 10. Pin Descriptions: Si3015 88
- Receive Input 89
- Filter 2 89
- Pin # Pin Name Description 89
- 11. Ordering Guide 90
- Millimeters 91
- Revision 1.1 to Revision 1.2 92
- Revision 1.2 to Revision 1.3 92
- Rev. 1.3 93 93
- CONTACT INFORMATION 94
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