Referencia rapida sistema pdh

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Trend´s E1/T1 Guide
T-Carrier
U.S. and Canada Japan 97728 kbps J4 97728 Kbps x3 T3 44736 kbps x7 T2 x3 32064 kbps J3 x5

Pocket Guide for E1 and PDH Testing

PDHworldwide E4 139264 kbps x4 E3 34368 kbps 34368 Kbps x4 E2 8448 kbps 8448 Kbps

AuroraTango E1 A hand-held Telecom and Datacom tester up to 2 Mbit/s with double analyser. G.703 balanced and unbalanced, V.11, V.24, V.35, V.36 and EIA530 interfaces. All the features needed for in-depth analysis, from Pulse mask check to jitter generation and analysis, including transfer and tolerance tests. VictorPlus Ahand-held analyzer and generator for Telecoms and Data networks of 2 Mbps and below, with physical interfaces for G.703, V.11, V.24, V.35 and V.36, it can perform inservice and out-ofservice measurements. It can be remotely managed through a TCP/IP network. VictoriaFamily A touch-screen hand-held family of testers which includes all ETSI/ANSI interfaces up to 2.5 Gbps with functions such as TCM,APS, M/N alarms G.783 sequences, frequency deviation and n x 64 and n x 56kbps tests at E1 and DS1 levels. Remote control through a TCP/ IP network.

6312 kbps J2 6312 Kbps x2 3152 kbps J1c x2

x4 E1 2048 kbps

x3

T1c

x30
Single Channel

T1 x24

1544 kbps

J1

64 kbps

Figure 1

PDH and T-carrier hierarchies

Figure 2

The E1 frame is the first hierarchy level.TrendCommunications

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Multiplexer A
Errors 64 kbps . . . 2 CRC-4 Writer ErrorIndication Reader 64 2 Mbps REBE (bit E=1) 2 . . . 64 64 kbps

Multiplexer B

CRC-4 Reader Error Indication Writer

Figure 3

The A multiplexer calculates and writes the CRC code, and the multiplexer B reads and checks the code.

E1 64 kbps
x 30 or x 31 .64 2 Mbps x4 2 8 2

E2
8 Mbps x4 34 8

E3
34 Mbps x4 140 34

E4
140 Mbps

E1
2 Mbps x 16 34 2

E3
34 Mbps 34

E4
140Mbps

140

E1
2 Mbps x 64 2

E4
140 Mbps

Figure 4

140

The PDH hierarchy

Standard G.704/732 G.742 G.751 G.751

Binary Rate 2,048 kbps±50 ppm 8,448 kbps±30 ppm 34,368 kbps±20 ppm 139,264 kbps±15 ppm

Size 256 bits 848 bits 1536 bits 2928 bits

Frame/s 8,000 9,962.2 22,375.0 47,562.8

Code HDB3 HDB3 HDB3 CMI

Amplitude 2.37-3.00V 2.37V 1.00V 1.00V

Attenuation 6 dB 6 dB12 dB 12 dB

Table 1

The PDH hierarchy figures

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Figure 5

The higher PDH hierarchies. A bit-oriented justification process is used to fit tributaries created with clock impairments.

TrendCommunications

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