Toshiba CTX28 manual RDTU3 Self Test and CSU Test Switch, RDTU3 Equalizer Switches

T1

RDTU Installation

RDTU3 Self Test and CSU Test Switch

1.Remove the RJ45 cable to perform the Self Test.

2.Set the SW8 and SW9 switches to On (see Table 8-5).

3.After self check passes, put the switches back into position for normal operation and insert the RDTU PCB back into the appropriate slot.

Table 8-5 SW8, SW9 RDTU3A Self and CSU Test

Mode	SW8 and SW9
	Both On
RDTU3A self test and CSU test mode	All LEDS turn Off
	except PSYNCH
	or SYNCH
Normal operation (non-loop back)	Both Off

RDTU3 Equalizer Switches

The distance between the Strata CTX, RDTU and CSU or RDTU to other Customer Premise Equipment (CPE) T1 may vary (0~655 ft.) as shown. (See “RDTU3 Cabling” on page 8-5.) The RDTU interface transmitter must be equalized and its impedance must be matched to the cable length connecting the RDTU to the CSU or other CPE, T1.

Set the appropriate SW1 Equalizer Switch setting and set SW1 to the setting that matches the RDTU cable length (see Table 8-6).

Table 8-6 Equalizer Setting Switch

Mode	Feet from CTX	SW4	SW5	SW6
Short	0 to 133 feet	Off	Off	Off
Semi-short	133 to 266 feet	On	Off	Off
Medium	266 to 399 feet	Off	On	Off
Semi-long	399 to 533 feet	On	On	Off
Long	533 to 655 feet	X	X	On

X = Doesn’t matter.

RDTU3 Loop Back Jumper Plugs

The RDTU PCB provides jumper plugs for loop back testing. Loop back tests are described in “Loop Back Testing” on page 8-19. See Table 8-5for switch settings for Loop Back tests.

RDTU3 Front Panel Indicators

The RDTU3 PCB provides seven LED indicators to show the status of RDTU: Busy or Idle condition, Alarm status, and Synchronization status. See Table 8-2for the function of each status LED. Figure 8-1shows the LED locations. Busy LED (BSY)—Turns on when one or more RDTU channels (lines) are in use. Also, when the RDTU does not receive the far end 1.544 mbs carrier signal, the RDTU will cause the BSY to be on steady.

8-8 Strata CTX I&M 06/04