Nortel Meridian 1 Manual page 69

Upgrade system installation through x11 release 21

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10 Disconnect power and alarm connections:

Disconnect all alarm connectors from the harness to the CPU/MEM

Unplug all power converter cards and all common equipment cards

from the CPU/MEM shelf.

Disconnect power connections and the power monitor connector

from the cabinet power distribution harness of the backplane on the

QSP41 shelf.

Tape all exposed power leads with electrical insulation tape.

Remove the QPC84 Power Monitor and set switches to disable

power monitoring in the CPU/MEM shelf. A QPC84 Power Monitor

vintage S or later is required. Refer to Circuit card installation and

testing (553-3001-211) for switch setup.

Reinstall the QPC84S Power Monitor.

11 Remove cards from network shelves and store them in a safe place.

12 Disconnect the tape unit or the mass storage unit power monitor and

alarm connectors. To do this, you must first remove the tape unit or the

mass storage unit and then disconnect the connectors. Tape all exposed

power leads with electrical insulation tape.

13 If you are using network shelves for PRI/DTI cards, do the following:

Install the PRI/DTI cards in network shelf card slots 2, 4, 6, 8, 10,

Plan to install at least one PRI/DTI card, as a master card with clock

reference, in the CPU/Network module of the option 61C column to

obtain clock reference for the PRI/DTI cards.

Upgrade system installation Upgrading to Meridian 1 system options

SL-1 L, LE, and N system upgrades

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