Table B. Provisioning Options - ADTRAN AHT1U Installation & Maintenance

Option (Mode)
DSX-1/DS1 Line Coding (Code)
DSX-1/DS1 Framing (FRMG)
Loopback Timeout (LBTO)
2
DS1 Output Level (TXLV)
-135 VDC Span Powering (SPWR)
Single Loop Operation
Single Loop AIS
DS1 Latching Loopback
Customer LOS Response
1
The FFFC mode sets the HTU-C to ESF and the HTU-R to SF. This mode should be used to force SF (DS1 from customer) to ESF (DSX-1 to network)
conversion in the absence of network-provided ESF framing.
2 This option is provisioned at the HTU-R.
3
When operating in FT1 mode and during periods of T1 loss of signal, LOS, or T1 AIS from the customer CI, the HDSL system will send in the network
direction from the HTU-C a Fractional DS1 idle signal consisting of a repeating 7E (HEX) byte payload within a framed/unframed T1 signal. In
addition, when optioned for FT1 mode, the setting for Customer Loss Response is ignored.
4 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 milli-second
code burst of 7E (HEX).
14

Table B. Provisioning Options

(Default settings are indicated in bold typeface)
Select Description
B8ZS ................... B8ZS line code enabled
AMI ..................... AMI line code enabled
Auto .................... Unit automatically detects for SF or ESF framing
ESF ...................... ESF framing enabled
SF ........................ SF framing enabled
UNF ..................... No framing enabled
1
FFFC ................. Forced Framing Format Conversion (ESF to SF)
None .................... No timeout of loopbacks is enabled
60 minutes ........... 60-minute loopback enabled
120 minutes ........ 120-minute loopback enabled
0 dB ..................... DS1 signal level delivered to customer is set at 0 dB
-15 dB .................. DS1 signal level delivered to customer is set at -15 dB
Enabled ............... Enables the high voltage module onboard the HTU-C to provide -135 VDC of span
powering to connecting HDSL equipment
Disabled .............. Disables -135 VDC span powering
Enabled
Disabled .............. Select Disabled for full T1 operation over both HDSL loops and alarm reporting for
both HDSL loops
Enabled ............... AIS is provided to the network when only one HDSL loop is out of synchronization,
or when a signal loss is detected at the HTU-R T1 receiver. This blocks all T1 DS0s
while only one HDSL loop is out of synchronization. In HDSL applications involving
an HRE, an HDSL loop synchronization loss on any leg of the HDSL circuit will
cause AIS. In all HDSL applications, AIS will not be generated when a loopback to
the network is made at the HTU-C, HRE, or HTU-R. However, AIS will be
generated to the network with an HTU-C customer loopback.
Disabled .............. AIS is provided to the network when both HDSL loops are out of synchronization, or
when a signal loss is detected at the HTU-R T1 receiver. This allows either DS0s 1
through 12 or 13 through 24 to be passed until full T1 bandwidth is restored. In HDSL
applications involving repeaters, AIS is provided to the network when an HDSL leg in
both loops are out of synchronization. In all HDSL applications, AIS will not be
generated when a loopback to the network is made at the HTU-C, HRE, or HTU-R.
However, AIS will be generated to the network with an HTU-C customer loopback.
T1 ......................... When optioned for T1 mode, the unit does not respond to DDS Latching Loopback codes
3
FT1 .................... DDS Latching Loopback operation is supported. The AHT1U and any HRE units which
are in the HDSL circuit are treated as Identical Tandem Dataports and the HTU-R is
treated as a different Tandem Dataport.
AIS ...................... Send AIS to network upon T1 loss of signal or T1 AIS from customer
LPBK ................... HTU-R initiates a network loopback upon T1 loss of signal or T1 AIS from customer
CDI 4 .................... HTU-R send customer disconnect indication upon loss of signal or T1 AIS from customer
Section 61245002L6-5, Issue 3 61245002L6-5C