Specifications

Si3220/25 Si3200/02
Preliminary Rev. 1.3 95
This product has
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might be set incorrectly. If this problem persists after the
power alarm settings are verified, a system fault is
probable, and the user should take measures to
diagnose the problem.
3.31.10. Upstream (Transmit) SC Channel Byte
The upstream SC channel byte looks similar to the
downstream SC channel byte except that the
information quickly transfers the most time-critical
information from the Dual ProSLIC to the GCI bus. Each
upstream SC channel byte transfer from the Dual
ProSLIC lasts for at least two consecutive frames to
represent a valid transfer. The upstream C/I bits are
defined as follows:
CI2A, CI1A, CI0A Monitors status data for channel A
CI2B, CI1B, CI0B Monitors status data for channel B
MR, MX Monitor channel handshake bits
(see Monitor Channel section)
Table 50. Automatic Linefeed State Transitions
Initiating Action Automatic Linefeed State
Transition
Detection/Control Bits Interrupt Enable/Status
Bits
Loop closure detected On-hook active  off-hook active,
Off-hook active  on-hook active
LCR (Register 9) LOOPE, LOOPS
(Register 16/19)
Ring trip detected Ringing  off-hook active RTP (Register 9) RTRIPE, RTRIPS
(Register 16/19)
Ringing burst
cadence
Ringing  on-hook transmission
On-hook transmission  ringing
T1EN, T2EN
(Register 23)
RINGT1E, RINGT2E,
RINGT1S, RINGT2S
(Register 15/18)
Power alarm detected Any state  open PQ1DL (RAM 50) PQ1E, PQ1S
(Registers 17/20)
Table 51. Monitored Data via Upstream SC Channel C/I Bits
C/I Bit Information Provided Mirrored Register Bits Context
CI2A Interrupt information on
channel A
IRQ0[0]+
IRQ0[1]+
IRQ0[2]
CI2A = 0: No interrupt on channel A
CI2A = 1: Interrupt present on channel A
CI1A Hook status information
on channel A
LCRRTP[0]
(LCR bit)
CI1A = 0: Channel A is on-hook
CI1A = 1: Channel A is off-hook
CI0A Ground key information
on channel A
LCRRTP[2]
(LONGHI bit)
CI0A = 0: No longitudinal current detected
CI0A = 1: Longitudinal current detected in chan-
nel A
CI2B Interrupt information on
channel B
IRQ0[4]+
IRQ0[5]+
IRQ0[6]
CI2A = 0: No interrupt on channel B
CI2A = 1: Interrupt present on channel B
CI1B Hook status information
on channel B
LCRRTP[0]
(LCR bit)
CI1A = 0: Channel B is on-hook
CI1A = 1: Channel B is off-hook
CI0B Ground key information
on channel B
LCRRTP[2]
(LONGHI bit)
CI0A = 0: No longitudinal current detected
CI0A = 1: Longitudinal current detected in chan-
nel B