zl30105 Zarlink Semiconductor, zl30105 Datasheet - Page 29

• Manufacturer Part Number: zl30105
• Description: Stratum 3 Redundant System Clock Synchronizer For T1/e1/sdh, Advanced Tca And H.110
• Manufacturer: Zarlink Semiconductor

The following is an example of how active/redundant setup can be configured.
The active timing card is set based on the desired application and is set to:
The HOLDOVER and REF_FAIL pins help evaluate quality of clocks and quality of redundant clock.
The redundant timing card is set based on desired applications and is set to:
The HOLDOVER and REF_FAIL pins help evaluate quality of clocks and quality of redundant clock.
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Primary master mode, SEC_MSTR=0
Normal Mode, MODE_SEL1:0=00 (forces device to the input reference set at REF_SEL)
Automatic mode, MODE_SEL1:0=11 (allows device to auto-switch if reference fails)
Normal (manual) mode, MODE_SEL1:0=00
REF2 and REF2_SYNC as the input reference, REF_SEL1=1 (forces redundant device to lock to output
of active card)
Secondary master mode, SEC_MSTR=1
MODE_SEL1:0=11
SEC_MSTR=0
MODE_SEL1:0=00
REF_SEL1:0=10
SEC_MSTR=1
Figure 19 - Clock Redundancy with Two Independent Timing Cards
BITS 0 clock
BITS 1 clock
BITS 0 clock
BITS 1 clock
Redundant Timing Card
Active Timing Card
REF2
REF0
REF1
REF2_SYNC
REF2_SYNC
REF2
REF0
REF1
Redundant Frame Sync (optional)
Redundant Clock
Active Clock
Active Frame Sync (optional)
Zarlink Semiconductor Inc.
ZL30105
ZL30105
ZL30105
OSC
OSC
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Output Clocks
Output Clocks
Data Sheet