zl30136 Zarlink Semiconductor, zl30136 Datasheet - Page 7

• Manufacturer Part Number: zl30136
• Description: Gbe And Telecom Rate Network Interface Synchronizer
• Manufacturer: Zarlink Semiconductor

3.0
The ZL30136 GbE and Telecom Rate Network Interface Synchronizer is a highly integrated device that provides
timing for network interface cards. The DPLL is capable of locking to one of three input references and provides
standard Ethernet clock rates for synchronizing Ethernet PHYs, and a highly programmable clock and frame pulse
for telecom interfaces such as T1/E1, DS3/E3, etc...
This device is ideally suited for systems with network interface cards that are synchronized to a centralized telecom
backplane. The ZL30136 synchronizes to backplane clocks and generates a synchronized and jitter attenuated
Ethernet clock and a PDH clock. A typical application is shown in Figure 2. In this application, the ZL30136
translates a 19.44 MHz clock from the telecom backplane to an Ethernet clock rate for the GbE 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 ZL30136 allows easy integration of Ethernet line rates
with today’s telecom backplanes.
High Level Overview
Line Card
GbE
1.544 MHz
ZL30136
N*8k
Central
ZL30121
Timing
Card
Figure 2 - Typical Application of the ZL30136
BITS A
A
DPLL
APLL
DPLL
PHY
GbE
125 MHz
A
19.44 MHz
Zarlink Semiconductor Inc.
B
Telecom Backplane
ZL30136
XOVER
7
19.44 MHz
25 MHz
B
B
DPLL
DPLL
APLL
GbE
PHY
BITS B
A
ZL30136
ZL30121
Central
1.544 MHz
Timing
Card
N*8k
Line Card
Short Form Data Sheet
GbE