PEB24901HV1.2 Lantiq, PEB24901HV1.2 Datasheet - Page 58

• Manufacturer Part Number: PEB24901HV1.2
• Manufacturer: Lantiq

Specifications of PEB24901HV1.2

• Lead Free Status / Rohs Status: Supplier Unconfirmed

4
4.1
The Uk0 interface is designed for data transmission on twisted pair wires in local
telephone loops, with basic access to ISDN and a user bit rate of 144 kbit/s.
Separation of the transmitted and received signals is done by means of echo
cancellation.
The following functions are transmitted over the twisted pair:
• Bidirectional:
• From LT to NT side:
• From NT to LT side:
On the Uk0 interface, transmission ranges of 4.2 km on wires of 0.4 mm diameter and
8 km on 0.6 mm wires are achieved without additional signal regeneration on the loop.
The transmission ranges can be doubled by inserting one repeater for signal
regeneration.
4.2
1 ms frames are transmitted via the Uk0 interface, each consisting of:
• 108 symbols: 144 bit scrambled and coded B + B + D data
• 11 symbols: Barker code for both symbol and frame synchronization (not scrambled)
• 1 symbol: Ternary maintenance symbol (not scrambled)
The 108 user data symbols are split into four equally structured groups. Each group
(27 ternary symbols, resp. 36 bits) contains the user data of two IOM-2 frames in the
same order (8B + 8B + 2D + 8B + 8B + 2D).
Different synchwords are used for each direction:
• Downstream from LT to NT+ + + – – – + – – + –
• Upstream from NT to LT– + – – + – – – +++
On the NT side, the transmitted Barker code begins 60 symbols after the received Barker
code and vice versa.
Semiconductor Group
– B1, B2, D data channels
– 120 kHz Symbol clock
– 1 kHz Frame and 40 kHz block clock
– Activation
– Power feeding
– Deactivation
– Remote control of test loops
– Indication of monitored code violations
Technical Description
General
Frame Structure of the Uk0 Interface
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PEB 24901
02.95