1 — Introduction
2902 MainStreet Technical Practices
1-7
May 2002 90-2906-01
The 2902 MainStreet system supports two E1 HDSL LIMs, each providing separate
HDSL transmission. A module is used at both ends of an E1 HDSL link to increase
the distance between midspan repeaters in a carrier service area. Each loop carries
16 DS0s as well as overhead information. The modules use full duplex, 2B1Q line
coding and continuous adaptive echo cancellation to improve loop reach and BER
(bit error rate) performance.
Bidirectional data is transmitted and received on each pair at a rate of 1168 kb/s. The
data from both pairs are combined to form a DS1. The 1168 kb/s rate includes
1024 kb/s of timeslot information and 144 kb/s of HDSL overhead (see Figure 1-4).
Figure 1-4 HDSL technology
The Control card on a 2902 MainStreet system supports E1 HDSL LIMs in the same
way that it supports E1 G.703 LIMs. The E1 HDSL LIMs provide the same service
as the E1 G.703 LIMs, except that they use HDSL technology and do not provide the
monitoring or bypass functions that are available on the E1 LIMs.
Figure 1-5 shows a typical application for E1 HDSL LIMs.
Figure 1-5 Typical E1 HDSL LIM or E1 HDSL LIM2 application
Note —
The E1 HDSL LIM and E1 HDSL LIM2 are not end-to-end
compatible. Both ends of an E1 HDSL link must have the same type
of HDSL LIM installed.
HDSL loop 1
HDSL loop 2
E1
interface
30 DS0s
E1
E1
2.048
Mb/s
2.048
Mb/s
HDSL
master
HDSL
slave
E1
interface
30 DS0s
1168 kb/s
1168 kb/s
7661
E1 HDSL LIM
or E1 HDSL LIM2
3700 m (12 139 ft)
0.4 mm wire, zero noise
Slave
Master
E1
X.21/V.35
X.21/V.35
Video
conferencing
Ethernet LAN
Centrex/PBX
3600 MainStreet
Multiservice Bandwidth
Manager
Router
2902
MainStreet
NTU
Summary of Contents for MainStreet 2902
Page 1: ...2902 MainStreet Network Termination Unit Release 1 0 H T E C H N I C A L P R A C T I C E S ...
Page 40: ...3 Mounting the unit 3 8 2902 MainStreet Technical Practices 90 2906 01 May 2002 ...
Page 50: ...4 Ground and power connections 4 10 2902 MainStreet Technical Practices 90 2906 01 May 2002 ...
Page 68: ...6 Connecting to the network 6 4 2902 MainStreet Technical Practices 90 2906 01 May 2002 ...
Page 90: ...7 Connecting to data devices 7 22 2902 MainStreet Technical Practices 90 2906 01 May 2002 ...
Page 108: ...10 Node management 10 10 2902 MainStreet Technical Practices 90 2906 01 May 2002 ...
Page 150: ...14 CPSS 14 6 2902 MainStreet Technical Practices 90 2906 01 May 2002 ...
Page 218: ...20 Codirectional DCM 20 6 2902 MainStreet Technical Practices 90 2906 01 May 2002 ...
Page 234: ...22 HCM rate adaption 22 10 2902 MainStreet Technical Practices 90 2906 01 May 2002 ...
Page 246: ...23 Cross connecting circuits 23 12 2902 MainStreet Technical Practices 90 2906 01 May 2002 ...
Page 254: ...24 Visual indicators 24 8 2902 MainStreet Technical Practices 90 2906 01 May 2002 ...
Page 266: ...25 Alarms 25 12 2902 MainStreet Technical Practices 90 2906 01 May 2002 ...
Page 278: ...26 System diagnostics 26 12 2902 MainStreet Technical Practices 90 2906 01 May 2002 ...
Page 298: ...27 Loopbacks 27 20 2902 MainStreet Technical Practices 90 2906 01 May 2002 ...
Page 332: ...Glossary GL 8 2902 MainStreet Technical Practices 90 2906 01 May 2002 ...
Page 343: ......
Page 344: ... 2002 Alcatel All rights reserved 90 2906 01 95 1820 01 00 C ...