Table J. Adtran Aht1U Specifications - ADTRAN AHT1U Installation & Maintenance

Loop Interface
Modulation Type ..................................... 2B1Q
Mode ........................................................ Full duplex, echo cancelling
Number of pairs ...................................... Two, with connections to narrowband and wideband
Bit Rate .................................................... 784 kbps per pair
Baud Rate ................................................ 392 baud per pair
Service range ........................................... Defined by CSA guidelines
Loop Loss ................................................ 36 dB maximum @ 200 kHz
Bridged Taps ........................................... Single Taps < 2 kft, total taps ≤ 2.5 kft
Performance ............................................ Compliant with Bellcore TA-NWT-001210
HDSL Tx Signal Level ........................... 13.5 dBm
Input Impedance ...................................... 135Ω
Return Loss ............................................. 20 dB (40 kHz to 200 kHz)
Power
Power Consumption .................................................. +5V: 2.7 watts typical; 48V (see Table H). Includes HTU-C, HTU-R, and with
Maximum Power Dissipation with an HRE ............. < 8.5 watts (see Table H)
Span Power ................................................................ -135 VDC internally generated from the -48 VDC switch battery
Fusing ........................................................................ -48 VDC (switch battery) is current-limited by a 500 mA Slo-Blo® subminiature
Clock
Clock Sources ......................................... Internal, DSX-1 derived
Internal Clock Accuracy ......................... ± 25 ppm, (exceeds Stratum 4). Meets T1.101 timing requirements
Tests
Diagnostics .............................................. Local loopback (HTU-C), remote loopback (HTU-R), troubleshooting screen
Physical
Mounting ................................................. Litespan 2000 CBA, Litespan 2012 CBA, or an ONU CBA
Dimensions .............................................. 4.42" high x 0.84" wide x 10.4" deep (11.22 cm x 2.13 cm x 26.4 cm)
Weight ..................................................... Less than one pound
Environment
Temperature ............................................ Operating (standard):
Humidity ................................................. Up to 95% noncondensing
Electrical/Safety Protection .................... Complies with Bellcore GR1089-CORE, UL1459, FCC Class A subpart J, and DSC
Control Port
Interface ................................................... RS232 (DB9)
Terminal Type ......................................... VT 100, or compatible
Async Speed ............................................ 1.2 kbps to 19.2 kbps
Data Format ............................................. 8 data bits, no parity, 1 stop bit
Part Numbers
1245002L6 .............................................. Asynchronous HTU-C Linecard Unit (AHT1U), Narrowband and Wideband
61245002L6-5C

Table J. ADTRAN AHT1U Specifications

or without and HRE
surface-mount fuse. +5 VDC is current-limited by a 3A quick-acting
subminiature surface-mount fuse.
-40°C to +70°C, Storage: -40°C to 85°C
requirements for a generic subscriber interface unit.
Section 61245002L6-5, Issue 3 19