Toshiba CTX28 manual Bptu Self Test, Bptu Cable Length Equalizer Switches, SW4 SW5 SW6

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BPTU Installation

Table 7-1 SW10 Internal or External ROM Setting

Mode	SW10	Note
		When there is an internal ROM on the CPU (TMP93PW46), BPTUA
Internal ROM		operates with the SW10.
	CPU	Use this mode when IC19 is not on PCB.
(Default mode)
		If the SW10 is in CPU position, BPTUA is operating with the internal
		ROM regardless of IC19 existence.
External ROM		BPTUA is operating with the external ROM (IC19).
	ROM	Use this mode only when IC19 is on PCB.
(Upgrade)
		If the SW10 is in ROM position without IC19, the BPTUA will not work.

BPTU Self Test

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

2.Remove the BPTU and set the SW8 and SW9 switches to On (see Table 7-2).

3.Insert BPTU back into the same slot that it was in. If all LEDS turn Off except PSYNCH or SSYNCH, the PCB has passed the self test.

4.After self check passes, put the switches back into position for normal operation (both Off) and insert the BPTU PCB back into the appropriate slot.

5.Plug the RJ45 network cable back in.

Note Do not use the BPTU as a clock extraction unit while in Self Test mode.

Table 7-2 SW8, SW9 BPTUA Self and CSU Test

Mode	SW8 and	Notes
	SW9
BPTUA self test	Both On	With both SW8 and SW9 On, all LEDS turn Off. If there is
		more than one BPTU, these LEDs will not flash.
Normal operation (non-loop	Both Off
back)

BPTU Cable Length Equalizer Switches

The distance between the Strata CTX, BPTU and CSU or BPTU to other Customer Premise Equipment (CPE) T1 may vary (0~655 ft.) as shown. (See “BPTU Cabling” on page 7-7.) The BPTU interface transmitter must be equalized and its impedance must be matched to the cable length connecting the BPTU to the CSU or other CPE, T1 (see Table 7-3).

Table 7-3 BPTU 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.

7-6 Strata CTX I&M 06/04