TONE-BD (Tone-Clock Circuit)
Issue 1 May 2002
8-1677555-233-143
n. Error Type 3840 — This error is not service-affecting and can be ignored.
It indicates that the circuit pack has received a bad control message from
the switch.
o. Error Type 3848
This error indicates that the IPSI or Tone-Clock circuit
pack had a loss of clock. If error 2305 is also logged, see step k.
p. Error Type 3856 This error indicates that the IPSI or Tone-Clock circuit
pack had a loss of clock. If error 2305 is also logged, see the note for Error
Type 2305, step k.
q. Error Type 3857, 3858
These errors are reported by software when an
uplink message is received from the active IPSI’s Archangel firmware.
Both error types indicate that a loss of one or more clock signals were
detected by the archangel, and subsequently restored by changing the
CLKSEL lead
1
. If the IPSI archangel restores the clock signals by
activating the [A] IPSI/Tone-Clock, then error type 3857 is reported. If the
clock signals are restored by activating the [B] IPSI/Tone-Clock, then error
type 3858 is reported. A Cold 2 Restart should occur in a port network
immediately after error type 3857 or 3858 is reported.
Duplex Reliability — Since there is only one IPSI in the port network, error
type 3858 can never occur. When error type 3857 occurs, it means the [A]
IPSI archangel experienced a loss of clock, but clocking was subsequently
restored using the [A] IPSI/Tone-Clock.
High or Critical Reliability — If the [B] IPSI is active and the [A] IPSI is
healthy when error type 3857 is reported, then software attempts to initiate
an IPSI interchange to activate the archangel and PKT-INT on the [A]
IPSI, thereby ensuring that the active Tone-Clock, PKT-INT, and archangel
are all on the same IPSI. If the [A] IPSI is unhealthy, then software initiates
a transition to EI-Fallback mode. If the [A] IPSI is active when error type
3857 is reported, it means the archangel for the [A] IPSI had to switch the
state of the CLKSEL lead more than once to restore the lost clock signals.
When error type 3858 is reported, if the [A] IPSI is active and the [B] IPSI is
healthy, then software attempts to initiate an IPSI interchange to activate
the archangel and PKT-INT on the [B] IPSI. If the [B] IPSI is unhealthy,
then software initiates a transition to EI-Fallback mode. If the [B] IPSI is
active when error type 3858 is reported, it means the archangel for the [B]
IPSI had to switch the state of the CLKSEL lead more than once to restore
the lost clock signals.
For the high and critical reliability configurations, error type 2305 should be
logged against MO_TGEN_BD for the standby IPSI/Tone-Clock after error
type 3857 or 3858 is reported.
r. Error Type 3872
These errors indicates that an IPSI or Tone-Clock
circuit pack had a loss of Data Clocks. This error will impact mainly users
on station connected to Digital circuit packs. These users could be with out
service. If error 2049 is also logged see step k.
1. Whenever, the active archangel detects a loss of clock, it will alternate the state of the
CLKSEL lead until the lost clock signals are restored.
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