zl30132 Zarlink Semiconductor, zl30132 Datasheet - Page 7

• Manufacturer Part Number: zl30132
• Description: Oc-192/stm-64 Sonet/sdh/10gbe Network Interface Synchronizer
• Manufacturer: Zarlink Semiconductor

2.0
The ZL30132 OC-192/STM-64 SONET/SDH/10GbE Network Interface Synchronizer is a highly integrated device
that provides timing for network interface cards. The DPLL automatically locks to one of three input references and
provides a wide variety of synchronized output clocks for synchronizing SONET/SDH, PDH, and Ethernet line
cards.
The ZL30132 uses internal state machines to control the mode of operation and reference selection. Once
configured, the device operates automatically and requires very little maintenance. Status is provided through the
serial port. An interrupt pin becomes active to indicate a change in device status. Some of the status functions (e.g.
lock, holdover) are accessible directly using device pins.
This device is ideally suited for systems with network interface cards that are synchronized to a centralized telecom
backplane. The ZL30132 synchronizes to backplane clocks and generates a synchronized and jitter attenuated
Ethernet/SONET/SDH clock and a PDH clock. A typical application is shown in Figure 2. In this application, the
ZL30132 translates a 19.44 MHz clock from the telecom backplane to an Ethernet or SONET/SDH clock rate for
the PHY and filters the jitter to ensure compliance with related clock standards. A programmable synthesizer
provides PDH clocks with multiples of 8 kHz for generating PDH interface clocks. The ZL30132 allows easy
integration of Ethernet line rates with today’s telecom backplanes.
High Level Overview
Central
ZL30121
Timing
Card
8 kHz
Line Card
OC-192
P
Nx8kHz
S
ZL30132
Synth
Figure 2 - Typical Application of the ZL30132
Prog
S
A
PHY
P
DPLL
DPLL
APLL
BITS A
A
622.08
8 kHz
MHz
Line Recovered Timing
B
Zarlink Semiconductor Inc.
System Timing Bus
ZL30132
XOVER
10
156.25
MHz
8 kHz
BITS B
B
B
DPLL
APLL
DPLL
PHY
P S
A
ZL30132
Synth
Prog
Nx8kHz
S
S
Line Card
10GbE
8 kHz
P
ZL30121
Central
Timing
Card
Short Form Data Sheet
Backplane
Telecom