ADC HiGain H2TU-C-231 List 3F User Manual page 66

Testing
The Armed mode has an automatic time-out of 120 minutes, but this timer is reset to 120 for any
of the following events:
• Loopback terminates (manually or time-out)
• Query
• Alternate query
• Far-End activate
• Another ARM command
This timer is inhibited while any of the valid command codes are being sent. Once the codes
are removed, the timer restarts at 120.
Table 23. Addressable Repeater Loopback Commands (A1LB, A2LB, A5LB)
Loopback
ARMING or NI LPBK (inband)
ARMING or NI LPBK (ESF Data Link)
IR LPDN or DISARM (inband)
IR LPDN or DISARM (ESF Data Link)
IOR LPBK (NLOC and CREM)
230-232 bit errors and 229-231 bit
(b)
errors
ILR-2 LPBK (NREM or CLOC)
(c)
20 bit errors
IR LPDN (except SMJK)
(d)
IR QUERY LPBK
IR ALTERNATE QUERY LPBK
TIME-OUT OVERRIDE
FAR END NI ACTIVATE
(e)
(A1LB and L2LB only)
IOR POWER DOWN (H2TU-C)
(a) The leftmost bit arrives first in all sequences. The detection algorithm functions reliably with a random 10
on the facility. The entire arming and loopback sequence can also be initiated at the remote H2TU-R location.
(b) The H2TU-R identifies CREM and the H2TU-C identifies NLOC with 231 bit errors, excluding the frame bits. When framed data
is being sent in the AUTO framing mode, the number of the 231 bit errors detached by the test set varies from 229 to 231,
depending on whether the test set counts frame errors as bit errors, and on the number of frame bits as data bit errors will
indicate fewer bits than the H2TU-R and H2TU-C transmit for a CI and NI loopback.
(c) The H2TU-R is assigned the ILR-2 loopback code. It responds with 20 bit errors (excluding the frame bits).
(d) The H2TU-C List 3F is enhanced to respond to the IR query loopback code (D5D5) when a SMJK loopback is activated.
(e) Allows the NIU Activate Command that originates at the H2TU-R to pass through inhibited toward the network and is always
enabled. No option to disable.
(f) The IOR Power Down code must remain present for the duration of the power down mode. When this code is removed, the
HDSL2 system returns to its normal unlooped and unarmed state.
58
Binary Code
(Hexadecimal Equivalent)
11000-11000 ...
1111-1111-0100-1000 (FF48)
11100-11100 ...
1111-1111-0010-0100 (FF24)
1101-0011-1101-0011 (D3D3)
1100-0111-0100-0010 (C742)
1001-0011-1001-0011 (9393)
1101-0101-1101-0101 (D5D5)
1101-0101-1110-1010 (D5EA)
1101-0101-1101-0110 (D5D6)
1100-0101-0101-0100 (C554)
(f)
0110-0111-0110-0111 (6767)
June 12, 2002
Description
(a)
Arming code
Arming code
Disarming code
Disarming code
NLOC—DSX-1 signal is looped back to the network
at the H2TU-C.
CREM—Signal from customer is looped back to the
customer at the H2TU-C.
NREM—DSX-1 signal is looped back to the network
at the H2TU-R.
CLOC—Signal from customer is looped back to the
customer at the H2TU-R.
Loopdown (H2TU-C or H2TU-R)
Query loopback
Alternate query loopback
Loopback time-out override
Unblock AIS
Removes HDSL2 line power
LTPH-UM-1149-01
-3
Bit Error Rate (BER)
H2TU-C-231 List 3F