363-206-295
Circuit Pack Descriptions
Issue 1
December 1997
7-29
On the BBG11 3DS3 side, the DS3 inputs from a DSX-3 are sent to both the
active and standby BBG11 3DS3 circuit packs. Only the active unit selects the
DS3 input. The SYSCTL circuit pack supervises the state of the active and
standby units so that the relay state of each is always the inverse of the other. The
hybrid on the active unit splits the DS3 input signals and sends them to the
standby unit and to its own receiver. To implement a protection switch on the DS3
side, the SYSCTL switches the relays on each unit to their opposite state.
When a BBG11 3DS3 is removed, shorting contacts on the backplane connector
operate so that the DS3 input signal from its companion unit is returned for proper
termination.
Fault Detection Circuitry
7
Monitoring and Testing.
7
The BBG11 3DS3 circuit pack has in-service and
out-of-service built-in test capability. In-service testing is continuous and errors
are reported when they occur to the SYSCTL via the intra-shelf control bus. An
out-of-service test is performed whenever the BBG11 3DS3 circuit pack is
inserted or recovers from a transient failure.
Loopbacks.
7
Two loopbacks are provided for each DS3 interface on the BBG11
3DS3 circuit pack. The terminal loopback bridges the DS3 desynchronizer output
signal (transmitted towards the DSX-3) back into the DS3 synchronizer input.
Operation of this loopback does not affect the signal transmitted to the DSX-3.
The facility loopback bridges the STS-1 output signal to the TSI back towards the
DSX-3. Operation of this loopback does not affect the signal transmitted to the
fiber. Both loopbacks are controlled by the SYSCTL through the intra-shelf control
bus.
Power Circuitry
7
The BBG11 3DS3 circuit pack receives two sources of
−
48 volts that are in turn
diode ORed, fused, and filtered before conversion to +5 volts to power the rest of
the circuit pack. A failure of the fuse or converter causes the red FAULT LED to
light.
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 ...