Owner's manual

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Physical description 831

Table 349

Switch SW2

Cable Type SW 2-1 SW 2-2

75 ohms Up (Off) Down (On)

120 ohms Down (On) Up (Off)

Switch SW3 - Clock Controller Configuration

This switch enables/disables (H/W) the on-board Clock Controller. Disable

the SW 3-2 if the on-board clock controller is not in use.

Table 350

Switch SW3

Switch Down (On) Up (Off)

Note

SW 3-1

——

Spare

SW 3-2 Disabled Enabled

Switch SW4 - Carrier Shield Grounding

This switch enables for the selective grounding of the Tx / Rx pairs of the

carrier cable. Closing the switch (down position) applies Frame Ground

(FGND) to the coaxial carrier cable shield, creating a 75 ohms unbalanced

configuration. This applies only to the NTBK05CA cable.

Table 351

Switch SW4

Switch Down (On) Up (Off)

SW 4-1 Rx – FGND Rx – OPEN

SW 4-2 Tx – FGND Tx – OPEN

Note: The usual method is to ground the outer conductor of the receive

coaxial signal.

Power requirements

The NTAK79 obtains its power from the backplane, drawing maximums of

2 A on +5 V, 50 mA on +12 V and 50 mA on –12 V.

The NTAK79 obtains its power from the backplane, drawing maximums of

2 amps on +5 V, 50 mA on +12 V and 50 mA on -12 V.

The NTAK79 obtains its power from the backplane, drawing maximums of

2 A on +5 V, 50 mA on +12 V and 50 mA on –12 V.

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311 02.06 Standard

27 August 2008