PEF24901HV22XP Lantiq, PEF24901HV22XP Datasheet - Page 44

• Manufacturer Part Number: PEF24901HV22XP
• Manufacturer: Lantiq

Specifications of PEF24901HV22XP

• Control Interface: HDLC
• Lead Free Status / Rohs Status: Compliant

The following information is transmitted over the twisted pair:
• Bidirectional:
• From LT to NT side:
• From NT to LT side:
On the U-interface transmission ranges of 4.2 km on wires of 0.4 mm diameter wires are
achieved without additional signal regeneration in the loop. The transmission ranges can
be doubled by inserting a repeater for signal regeneration.
3.5.1
1 ms frames are transmitted across the U-interface, each consisting of:
• 108 symbols: 144-bit scrambled and coded B1 + B2 + 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
same order (8B + 8B + 2D + 8B + 8B + 2D).
Different syncwords 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.
Table 7
Data Sheet
1
13
25
D
D
D
– B1, B2, D data channels
– 120 kHz Symbol clock, 160 kbit/s Transmission rate
– 1 kHz Frame
– Activation
– Power feeding
– Deactivation
– Remote control of test loops
– Indication of monitored code violations
1/2
1
2
2
14
26
D
D
D
1/2
1
2
4B3T Frame Structure
Frame Structure for Downstream Transmission LT to NT
3
15
27
D
D
D
1/2
1
2
4
16
28
D
D
D
1
2
3
5
17
29
D
D
D
1
2
3
+ + + – – – + – – + –
– + – – + – – – + + +
6
18
30
D
D
D
1
2
3
45
7
19
31
D
D
D
1
2
3
8
20
32
D
D
D
1
2
3
9
21
33
D
D
D
1
2
3
Functional Description
10
22
34
D
D
D
1
2
3
®
-2 frames in the
11
23
35
PEF 24901
D
D
D
1
2
3
2002-09-30
DFE-T
12
24
36
D
D
D
1
2
3