zl30138 Zarlink Semiconductor, zl30138 Datasheet - Page 8

• Manufacturer Part Number: zl30138
• Description: Oc-192/stm-64 Sonet/sdh/10gbe Stratum 2/3/3e System Synchronizer/sets
• Manufacturer: Zarlink Semiconductor

2.0
The ZL30138 SONET/SDH/Ethernet Stratum 2/3E/3 System Synchronizer and SETS device is a highly integrated
device that provides all of the functionality that is required for a central timing card in carrier grade network
equipment. The basic functions of a central timing card include:
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In a typical application, the main timing path uses DPLL1 to synchronize to either an external BITS source or to a
recovered line timed source. DPLL1 monitors all references and automatically selects the best available reference
based on configurable priority and revertive properties. DPLL1 provides the wander filtering function and the P0
synthesizer generates a jitter filtered clock and frame pulse for the system timing bus which supplies all line cards
with a common timing reference. The APLL is used to generate a reference clock for an Ethernet PHY which can be
used to synchronize remote equipment. A derived output timing path using DPLL2 is available to support the SETS
function. In this case DPLL2 uses a filter above 10 Hz to prevent it from filtering wander.
Input reference monitoring for both frequency accuracy and phase irregularities
Automatic input reference selection
Support of both external timing and line timing modes
Hitless reference switching
Wander and jitter filtering
Optional Input phase transient filtering (Stratum 3E phase build-out)
Master/slave crossover for minimizing phase alignment between redundant timing cards
Independent derived output timing path for support of the SETS functionality
High Level Overview
Central
Timing
Card
DPLL2
Derived
T4
Output
P
P1
P
A
PHY
DPLL1
SyncE
DPLL
APLL
GbE
PHY
T0
Tx
S
ZL30138
Figure 2 - Typical Application of the ZL30138
SONET/SDH
B
Line Card
ZL30117
P0
Card
Line
A
Zarlink Semiconductor Inc.
Line Recovered Timing
System Timing Bus
BITS A
ZL30138
11
BITS B
B
ZL30138
GbE Line
ZL30136
P0
Card
SyncE
DPLL1
APLL
A
GbE
PHY
S
T0
DPLL
Tx
PHY
P
Short Form Data Sheet
B
Derived
Output
P1
DPLL2
T4
Central
Timing
Card
S