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Depends on what generation TA900e you have. If you have 2nd Gen (white unit) then only ports 3/4 can be used for PRI interfaces. If you have 3rd gen (Black unit) then 1-4 can be used for PRI interfaces but maximum of 2 can be configured depending on what p/n you ordered regarding number of DSPs, we sell a 30 and 60 count version.
If you do a show version it will show you have many you have like so:
ADTRAN, Inc. OS version R13.2.2.E
Mainline Version: ENM.17.94
P4 Changelist: 651357
Built on: Mon Aug 6 05:34:43 CDT 2018
Hardware version L.188.8.131.52-0
Boot ROM version R10.9.3.B1
Built on: Fri Apr 11 09:42:09 CDT 2014
Compatibility Version: 1
Copyright (c) 1999-2018, ADTRAN, Inc.
Platform: Total Access 908e (3rd Gen), part number 4243908F5
Serial number CFG1384365
Flash: 97120256 bytes DRAM: 509648896 bytes
Tiger uptime is 3 weeks, 3 days, 5 hours, 35 minutes, 53 seconds
slot 0, DSP 1
DSP software version: G3.R1.4..2-R
DSP hardware version: Freescale BSC9131
Total channels: 60
Let me know if you have any other questions.
Awesome! Thank you!