Toshiba CTX28 用户手册
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ISDN Interfaces
BPTU Installation
7-6
Strata CTX I&M 06/04
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
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.
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
Equipment (CPE) T1 may vary (0~655 ft.) as shown. (See
.) 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
length connecting the BPTU to the CSU or other CPE, T1 (see
).
Table 7-1
SW10 Internal or External ROM Setting
Mode
SW10
Note
Internal ROM
(Default mode)
CPU
When there is an internal ROM on the CPU (TMP93PW46), BPTUA
operates with the SW10.
operates with the SW10.
Use this mode when IC19 is not on PCB.
If the SW10 is in CPU position, BPTUA is operating with the internal
ROM regardless of IC19 existence.
ROM regardless of IC19 existence.
External ROM
(Upgrade)
ROM
BPTUA is operating with the external ROM (IC19).
Use this mode only when IC19 is on PCB.
If the SW10 is in ROM position without IC19, the BPTUA will not work.
Table 7-2
SW8, SW9 BPTUA Self and CSU Test
Mode
SW8 and
SW9
Notes
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.
more than one BPTU, these LEDs will not flash.
Normal operation (non-loop
back)
back)
Both Off
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.