363-206-295
Circuit Pack Descriptions
Issue 1
December 1997
7-67
The STS-1 signals are byte-interleaved and scrambled in a frame synchronous
scrambler to produce a SONET format compatible STS-12 signal. The STS-12
signal is used to amplitude modulate a laser transmitter to convert the electrical
signal to an NRZ-encoded SONET compatible OC-12 optical signal.
Receive Direction.
7
The 23G/23G-U OLIU circuit pack receives an OC-12 optical
signal that is an NRZ-coded SONET compatible signal. An optical receiver
converts the optical OC-12 signal to an electrical STS-12 signal. An STS-12 rate
clock is recovered and used to retime the data.
The 23G/23G-U OLIU frames on the retimed STS-12 data, demultiplexes it into 12
STS-1 signals, and provides the transport overhead access.
The 23G/23G-U OLIU performs pointer interpretation, frequency justification, and
pointer generation on each of the STS-1 signals, using the local clock and frame
from the selected TSI circuit pack. The result is 12 STS-1 signals that are frame
synchronous with each other and with the local clock and frame sync.
Each STS-1 signal is bridged to the service and protection TSI circuit packs.
The 23G/23G-U OLIU sends a clock derived from the recovered receive clock to
the TGS circuit packs for loop timing. The 23G/23G-U OLIU provides transport
overhead access in the receive direction.
Control Circuitry
7
The 23G/23G-U OLIU circuit pack interfaces with the SYSCTL and the OHCTL
circuit packs.
Control and Maintenance Functions .
7
The 23G/23G-U OLIU provides
maintenance elements for reporting the status of the circuit pack and the incoming
STS-1 and OC-12 signals to the SYSCTL. Conversely, the 23G/23G-U OLIU
responds to control signals from the SYSCTL.
■
SYSCTL: The 23G/23G-U OLIU communicates with the SYSCTL circuit
pack via a control interface. The 23G/23G-U OLIU provides maintenance
elements for reporting the status of the circuit pack and the incoming
STS-1 and OC-12 signals. These maintenance elements are used by the
SYSCTL for fault detection and isolation. Conversely, the 23G/23G-U OLIU
responds to control signals from the SYSCTL, such as LED and protection
switching controls.
■
Transport Overhead Channel Interface: The 23G/23G-U OLIU accesses
the SONET overhead and routes this data to the OHCTL.
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 ...