Zarlink's PDH products supports standards from Telecordia, ANSI, ETSI & ITU while accepting a wide range of common telecom input frequencies and providing a wide range of telecom clocks & frame pulses.
| Part Number | Part Name | Product Preview | Data Sheet | Product Information |
| ZL30100 | T1/E1 System Synchronizer | |
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| ZL30101 | T1/E1 Stratum 3 System Synchronizer | |
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| ZL30102 | Stratum 4/4E Redundant System Clock Synchronizer for T1/E1 and H.110 | |
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| ZL30105 | Stratum 3 Redundant System Clock Synchronizer for T1/E1/SDH, Advanced TCA and H.110 | |
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| ZL30109 | DS1/E1 System Synchronizer with 19.44 MHz Output | |
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| Part Number | Part Name | Product Preview | Data Sheet | Product Information |
| ZL30106 | SONET/SDH/PDH Network Interface DPLL | |
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| ZL30108 | SONET/SDH Network Interface DPLL | |
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| ZL30110 | Telecom Rate Conversion DPLL | |
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| ZL30111 | POTS Line Card PLL | |
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| ZL30112 | SLIC/CODEC PLL | |














