6
TEST7
8
9
1 
+5 V
2 
GND
3 
64 kHz
4 
8 kHz
5
6. MAINTENANCE
The TA 750 BCU does not require routine maintenance for design operation.
ADTRAN does not recommend that repairs be attempted in the field. Repair services are obtained by returning the defective unit to ADTRAN Customer Service department.
Figure 3. DB-9 Connector Pinout
T1 Loopbacks
The TA 750 supports several T1 loopbacks via the craft interface. These loopbacks include:
•Initiating a remote payload or line loopback command (ESF mode only).
•Responding to a remote payload or line loopback command (ESF mode only).
•Responding to a remote CSU loopback command.
Figure 2 displays where the various loopbacks occur in the TA 750 BCU circuitry.
Self Test
The BCU goes into self test when inserted into an active TA 750 chassis. The self test checks internal BCU circuitry. A failed test causes the faceplate Network T1 LED to blink red.
5. SPECIFICATIONS
Refer to Table 5 for TA 750 BCU specifications.
Table 5. Specifications
Mechanical
Size: 1 11/16" W x 3" H x 10"L
Weight: 1 lb.
Environmental
Operating Temperature:
Storage Temperature:
Relative Humidity: Up to 95%
Configuration Codes
Power Code (PC): IN: F, OUT: C Telecommunication Code (TC): IN: X, OUT: X Installation Code (IC): IN: A, OUT: -
7. WARRANTY AND CUSTOMER SERVICE
ADTRAN will replace or repair this product within 10 years from the date of shipment if it does not meet its published specifications or fails while in service (see: ADTRAN Carrier Networks Equipment Warranty, Repair, and Return Policy and Procedure, document:
Contact Customer And Product Service (CAPS) prior to returning equipment to ADTRAN. For service, CAPS requests, or further information, contact one of the following numbers:
Part Number
1175012L1
ADTRAN Sales
Pricing/Availability (800)
ADTRAN Technical Support
Presales Applications/Postsales Technical Assistance (888)
Standard hours:
Emergency hours: 7 days/week, 24 hours/day
ADTRAN Repair/CAPS
Return for Repair/Upgrade (256)
Repair and Return Address
ADTRAN, Inc.
CAPS
Section | 5 |