363-206-295
Circuit Pack Descriptions
Issue 1
December 1997
7-41
General Description of Operation
7
The BBG12 3STS1E circuit pack provides bidirectional transport of three EC-1
signals through the DDM-2000 OC-12 Multiplexer. The 3STS1E circuit pack
performs maintenance and provisioning functions associated with the STS-1 and
EC-1 signals. The 3STS1E circuit pack interfaces to the TSI circuit pack at the
STS-1 rate, to the STSX-1, and to the SYSCTL, and it receives timing signals
from the TSI circuit pack.
Detailed Description of Operation
7
Transmission Circuitry
7
Transmit Direction.
7
Figure 7-17 provides an overall block diagram of the BBG12
3STS1E circuit pack. The transmit direction is the direction towards the fiber and
the receive direction refers to the direction towards the STSX-1. In the transmit
direction, the BBG12 3STS1E receives up to three incoming B3ZS encoded EC-1
signals from the STSX-1 cross-connection panel. A closed protection relay
contact routes each EC-1 signal to a circuit that splits the signal and sends one
output to the companion (standby) circuit pack and the other to its own receiver.
The BBG12 3STS1E receiver performs equalization and clock recovery, B3ZS
decoding, and optional automatic AIS insertion. It performs pointer processing on
the input data stream and outputs three corresponding data streams, time-aligned
with a single frame signal, to the TSI circuit packs.
Receive Direction.
7
The BBG12 3STS1E receives two STS-1 data signal inputs
for each of the three EC-1 channels: one from the working TSI circuit pack and
one from the standby TSI circuit pack. A jumper allows the user to insert or
remove a LBO network (225 ft. of 734A-type cable equivalent) to provide the
required signal level and shape at the STSX-1 cross-connection panel.
Control Circuitry
7
The BBG12 3STS1E circuit pack interfaces with the SYSCTL circuit pack via the
intra-shelf control bus. The BBG12 3STS1E circuit pack provides maintenance
elements for reporting the status of the circuit pack, status of the incoming STS-1
and EC-1 signals, as well as the circuit pack inventory information (
CLEI code,
date of manufacture, etc.). These maintenance elements are used by the
SYSCTL for fault detection and isolation. Conversely, the BBG12 3STS1E
responds to control signals from the SYSCTL (such as active and fault LED
controls).
Содержание DDM-2000 OC-12
Страница 1: ...363 206 295 Issue 1 December 1997 DDM 2000 OC 12 Multiplexer Release 7 0 User Service Manual Volume I ...
Страница 37: ...Tables xxxviii Issue 1 December 1997 A A SONET Overview A 1 SONET Payloads A 18 A 2 SONET Transport Rates A 19 ...
Страница 506: ...INS PROG 8 of 8 Page INS PROG COMMANDS RELATED rtrv eqpt rtrv ne OC 12 DDM 2000 1997 December 1 Issue 11 89 ...
Страница 528: ...RTRV ATTR ALM 2 of 2 Page RTRV ATTR ALM COMMANDS RELATED set attr alm OC 12 DDM 2000 1997 December 1 Issue 11 111 ...
Страница 565: ...RTRV OC3 3 of 3 Page RTRV OC3 COMMANDS RELATED rtrv sync 11 148 1997 December 1 Issue OC 12 DDM 2000 ...
Страница 664: ...SET FEAT 3 of 3 Page SET FEAT COMMANDS RELATED rtrv feat OC 12 DDM 2000 1997 December 1 Issue 11 247 ...
Страница 766: ... Ctl T TOGGLE 2 of 2 Page Ctl T TOGGLE COMMANDS RELATED logout rlgn OC 12 DDM 2000 1997 December 1 Issue 11 349 ...
Страница 847: ...Multiplexer OC 12 DDM 2000 7 Release TARP TOP Manual User Service II Volume 363 206 295 1 Issue 1997 December ...
Страница 867: ...363 206 295 TOP Maintenance and Operation BLANK LEFT INTENTIONALLY PAGE THIS 12 1997 December 1 Issue ...
Страница 1145: ...Order Circuit 363 206 295 NTP 029 1 of 1 Page 1997 December 1 Issue Unused LISTED ORDER IN BELOW ITEMS DO TO GO DETAILS FOR ...
Страница 1146: ...Order Circuit 363 206 295 NTP 030 1 of 1 Page 1997 December 1 Issue Unused LISTED ORDER IN BELOW ITEMS DO TO GO DETAILS FOR ...
Страница 1182: ...Turnup System 363 206 295 NTP 033 1 of 1 Page 1997 December 1 Issue Unused LISTED ORDER IN BELOW ITEMS DO TO GO DETAILS FOR ...
Страница 1243: ...Clearing Trouble 363 206 295 TAP 107 1 of 1 Page 1997 December 1 Issue Unused ...
Страница 1393: ...363 206 295 DLP 513 1 of 1 Page 1997 December 1 Issue Unused ...
Страница 1394: ...363 206 295 DLP 514 1 of 1 Page 1997 December 1 Issue Unused ...
Страница 1456: ...363 206 295 DLP 523 7 of 7 Page 1997 December 1 Issue OC 12 via Access Broadcast Video for Cross connections of Example 4 Figure ...
Страница 1465: ...DLP 525 363 206 295 1997 December 1 Issue 6 of 2 Page Schematic Ring Virtual ATM Sample 1 Figure ...
Страница 1469: ...DLP 525 363 206 295 1997 December 1 Issue 6 of 6 Page Ring Virtual ATM OC 12 DDM 2000 for Cross connections of Example 4 Figure ...
Страница 1565: ...363 206 295 DLP 543 6 of 5 Page 1997 December 1 Issue Network Broadcast Video of Test Transmission 2 Figure ...
Страница 1566: ...DLP 543 363 206 295 1997 December 1 Issue 6 of 6 Page Network Ring Virtual ATM of Test Transmission 3 Figure ...