ADTRAN 1245001L6, Руководство по установке и обслуживанию

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61245001L6-5G Section 61245001L6-5, Issue 7 3
Table 2. SW1 Rotary Switch Option Settings 1
Switch Position Description
SW1 .......................... DSX-1 Line Buildout Selects operation of the line buildout equalizer in series with the DSX-1
output.
EXT ......... Selects external line build-out 2
0 ............... Line length from 0-133 feet of ABAM cable
133 ........... Line length from 133-266 feet of ABAM cable
266 ........... Line length from 266-399 feet of ABAM cable
399 ........... Line length from 399-533 feet of ABAM cable
533 ........... Line length from 533-655 feet of ABAM cable
1
The HTU-C transfers the local configuration to the HTU-R when circuit synchronization is achieved. The HTU-R then sets
its configuration to match the HTU-C.
2
If external line build-out is selected, the signal transmitted by the HTU-C is a 12V p-p signal. This must be considered when
measuring the signal at the DSX EQ faceplate Bantam jack. The signal may appear hotter than it should be.
Table 3. SW2 Option Settings
Position Description
AIS ................ Upon customer Loss of Signal (DS1) at the terminating end of the HDSL circuit, AIS is generated from the
HTU-R toward the network.
LBK .............. Upon customer Loss of Signal (DS1) at the terminating end of the HDSL circuit, a logical network loopback is
initiated at the HTU-R.
CDI 3
.......................
Upon customer Loss of Signal (DS1) at the terminating end of the HDSL circuit, the HTU-R returns DS1 Idle
Signal to the network. This signal is also known as Customer Disconnect Indication (CDI).
3
The CDI is generated by transmitting the framing received from the network while overwriting the payload with a repeating
pattern. For applications where the DS1 is Extended Superframe, the data link is overwritten with a Yellow Alarm that is
interrupted once every second by a 100-millisecond code burst of 7E HEX).
Table 4. SW3 Option Settings
(Default settings are indicated in bold typeface)
Switch Function Description
SW3-1 ........................... Latching Loopback
T1 ........................................... Selects full T1 loopbacks
FT1 ......................................... Enables DDS Latching Loopback operation
SW3-2 ........................... Code Select
AMI ........................................ Alternate Mark Inversion (AMI) is selected
B8ZS ...................................... B8ZS line code is selected
SW3-3 ........................... Loopback Timeout
Enabled ................................... Loopback timeout is enabled, 120 minutes
Disabled ................................. Loopback timeout is disabled