Nortel Networks 311 사용자 설명서

Physical description

931

Table 384
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 385
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 386
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

01.04

Standard

Release 5.0

23 May 2008