363-206-295
Maintenance Description
9-26
Issue 1
December 1997
OC-3/OC-12 Path Switched Ring (0x1)
9
A DDM-2000 OC-3 ring shelf can function in a ring-on-ring application using the
0x1 interface capability of the OC-12 or FT-2000 OC-48 Lightwave System ring.
The OC-3 shelf functions in the normal path switched ring mode. VT/STS path
protection switching is done on the OC-3 shelf.
In single homing, the OC-3 ring shelf interconnects through its main-1/main-2 ring
interface either directly or through another OC-3 ring shelf to the low-speed OC-3
0x1 interface on a single OC-12 or FT-2000 OC-48 Lightwave System shelf.
In dual homing, the OC-3 ring shelf interconnects directly or through another
OC-3 ring shelf with the OC-3 interfaces on two separate and normally non-
colocated OC-12 or FT-2000 OC-48 Lightwave System shelves.
Status of ACTIVE LED on Rings
9
In ring applications, ACTIVE LEDs on each main OLIU are always lit because it is
not known if a signal on that OLIU is currently being selected by a far-end NE.
Loopbacks
9
The DDM-2000 OC-12 Multiplexer allows technicians to do loopbacks on all low-
speed DS3 and EC-1 interfaces. Low-speed DS3 and EC-1 electronic loopbacks,
directed toward the high-speed OC-12, are individually controllable from the CIT.
Facility loopbacks can also be set up towards the DSX on all low-speed DS3 and
EC-1 interfaces. Active electronic loopbacks are noted by the user panel's
abnormal (ABN) indicator and in the alarm and status report. See the
opr-lpbk-ds3
,
opr-lpbk-ec1
,
rls-lpbk-ds3
, and
rls-lpbk-ec1
commands in Section 11, "Commands and Reports."
Front access to the OLIU optical connectors allows an easy manual OC-3 and
OC-12 optical loopback. This loopback is performed by connecting a fiber jumper
from the OLIU output to its input. On the 21-type OLIUs, no optical attenuator is
required for this loopback. However, the optical output power switch on the 21G/
21G-U OLIU circuit pack must be set for low output power to prevent receiver
overload when an optical loopback is set up. On the 23G/23G-U OLIU, an external
optical attenuator is required to prevent receiver overload during manual optical
loopback.
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 ...