363-206-295
Circuit Pack Descriptions
Issue 1
December 1997
7-35
Control Circuitry
7
The BBG11B 3DS3 circuit pack interfaces with the SYSCTL via the intra-shelf
control bus. Redundancy in the intra-shelf control bus assures the level of control
required to perform protection switching and alarming of a faulty circuit pack. The
BBG11B 3DS3 provides maintenance elements for reporting the status of the
circuit pack, status of the incoming STS-1 and DS3 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 BBG11B 3DS3 responds to control signals from the SYSCTL
(such as active and fault LED controls).
Timing Circuitry
7
The BBG11B 3DS3 circuit pack derives its timing information from the recovered
DS3 clock of the DSX-3 incoming signal. In the transmit direction, a 44.736 MHz
clock is recovered from the incoming DS3 signal and is used to recover DS3 data.
In the receive direction, a smoothed 44.736 MHz clock is generated by a phase-
locked loop to accompany the DS3 signal extracted from the STS-1 payload.
In addition to the recovered DS3 clock, the BBG11B 3DS3 circuit pack requires
STS-1 timing supplied by the TSI circuit pack, via the circuit pack edge connector,
from the backplane.
Protection Circuitry
7
Optional 1x1 nonrevertive BBG11B 3DS3 circuit pack protection is provided.
Switch points for the STS-1 side of the BBG11B 3DS3 are located on the TSI
circuit packs. Switch points for the DS3 side are implemented with relays on the
3DS3 circuit pack. To ensure that the relays can be operated when the circuit pack
fails, the relay is controlled by the SYSCTL via the control interfaces. Also, if
power to the board is lost, the relay switches autonomously to the standby state.
When a new board is inserted, it defaults to the standby state until provisioned
active by the SYSCTL.
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 ...
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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 ...