Test result for the local line unit (1 - test failed, 0 - success):
bit 0 - 2180 DS1 frame sync test (HiGain only)
1 - 2180 DS1 data test (HiGain only)
2 - LIU DS1 frame sync test (HiGain only)
3 - LIU DS1 data test (HiGain only)
4 - External DS1 frame sync test (HiGain only)
5 - External DS1 data test.
6 - Mux sync test on HDSL LOOP 1
7 - Mux sync test on HDSL LOOP 2
8 - Reserved.
9 - Mux frame error test on HDSL LOOP 1
10 - Mux frame error test on HDSL LOOP 2
11 - Mux CRC test on HDSL LOOP 1
12 - Mux CRC test on HDSL LOOP 2
13 - Mux DL test on HDSL LOOP 1
14 - Mux DL test on HDSL LOOP 2
15 - Analog loopback test.
16 - Digital loop test.
17 - HGF HDSL loop test (HiGain only)
18 - HGF write/readback test (HiGain only)
19 - HGF poll lock test (HiGain only).
20 - HGF activity monitor test (HiGain only).
21 - HGF zeroes TX and detect test (HiGain only).
22 - HGF ones TX and detect test (HiGain only).
23 - Transceiver poll test on HDSL LOOP 1
24 - Transceiver poll test on HDSL LOOP 2
25 - PROM check test.
26 - External RAM test.
27 - Non-Volatile RAM test.