Teledex Y Series User Manual download pdf (Page 11)

Y SERIES EXP212, EXP224, AND EXP248 USER GUIDE www.teledex.com 11

–36V DC (EXP212, EXP224), –72V through –38V

DC (EXP248), and make sure that the polarity is

correct.

Warning—Ensure that all power sources to the

chassis (power distribution panel) are turned off

during the connection.

Note—It is recommended that the –48V DC

power be supplied directly and independently

by a power feeding system. Also, avoid having a

parallel or mutual connection with other –48VDC

power supplies of telecommunication equipment.

This is to guard against interference when other

equipment is on.

AC POWER CONNECTION (OPTION)

If your EXP212, EXP224, and EXP248 uses

AC power, connect the AC power cord to the

AC supply socket on the front panel (EXP212,

EXP224) or rear panel (EXP248) of the DSLAM

(refer to Figure 1.5), and plug the cord into the

external power source. The voltage must be 100

to 240 V AC.

GROUND CONNECTIONS

This section provides the grounding rule for the

EXP212, EXP224, and EXP248. All remote system

sites must be properly grounded for optimum

system performance.

In Central Office

There should be a CO GND that is adequately

grounded. If the measured resistance from the

grounding screw (on the rear panel of the DSLAM,

refer to Figure 1.5) to CO GND is less than 5 Ohm,

then it can be assumed that the system is well

grounded. If the measured resistance is larger

than 5 Ohm, it is recommended to connect the

grounding screw to CO GND using #14 or #12

AWG wire gauge conductor.

In Remote Cabinet

The EXP212, EXP224, and EXP248 should be

grounded by connecting a #14 or #12 AWG

conductor between the grounding screw (on the

rear panel of the DSLAM, refer to Figure 1.5)

and the earth ground or main grounding bar.

The resistance between the chassis and the

grounding bar should be less than 25 Ohm.

Figure 1.5A EXP212, EXP224 Grounding Screw

on the Rear Panel

Figure 1.5B EXP248 Grounding Screw and AC

Supply Socket (Option) on the Rear Panel

1.2.4 CONNECTING THE FAN CABLE

(EXP248 ONLY)

There are two FAN ports on the front panel of

EXP248. One is on the FAN card; the other is

beside the housekeeping (HK) port. To make

the fans work, you must use an RJ45-to-RJ45

connector cable to connect the two FAN ports.

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