ADC HiGain H2TU-C-388 List 7F Manual page 30

Provisioning
H2TU-R DS1 Frame Conversion (CONV) Option. Frame format conversion is only applicable to the
remote H2TU-R, but selectable by the H2TU-C or H2TU-R. This option enables the network to be ESF which is
used to embed SPRM or NPRM into the data link toward the network. During conversion, frame bit errors are
regenerated to ensure transparency.
The HDSL2 system attempts to find ESF or SF framing or determines that no framing exists. The DS1 framing is
then synchronized with the HDSL2 frame. If the framing is lost, the system generates an Out-of-Frame (OOF)
defect which results in UAS-P. As a result, the system reverts to frame search mode.
This option has the following settings:
• OFF — No frame conversion takes place. All framing issues are determined by the FRMG option settings of
AUTO, ESF, SF, and UNFR.
• ACON — This is the automatic conversion setting. If the system detects ESF from the network and SF from
the CPE, it automatically converts the CPE SF to ESF toward the network as well as the network ESF to SF
toward the CPE.
Upon power-on-reset, after loopdown, or after changing the frame conversion option, the framing needs to
be re-established before a complete conversion takes place. If there is a failure condition (LOS, AIS, or LOF)
during steady state, the previous conversion state is maintained to ensure continuity when the system returns
from the failure condition.
If SF is received from the network, the H2TU-R forces an ESF toward the network for about 1.5 seconds.
This signals to the far end PM-NIU at the network boundary that frame conversion is requested. If the far end
PM-NIU is capable of conversion, it changes the framing to ESF. If not, then the H2TU-R reverts to SF and
does not apply any conversion.
If an ESF is received from the CPE, it is passed on to the network, and the network's inbound framing is
passed on to the CPE.
• FCON — This is the forced conversion setting.
the ACON and FCON settings for the CONV option. The responses are identical, except in cases 3 and 4. In
these cases, the FCON reply is attempting to force the network or the far end PM-NIU to send ESF. It also
alerts the CPE with an AIS alarm pattern while forcing the ESF to the network. Continuity is maintained as
for ACON. Table 9
20
Table 7. DS1/DSX-1 24-Hour PM Threshold
Parameter
CV-L (BPV)
CV-P (CRC)
ES-L, ES-P, PRM-NE PRM-FE
SES-L, SES-P
UAS-P, UAS-L
and Table 10 on page 22 list the ESF and SF frame formats, respectively.
July 21, 2003
Threshold Count
133,400
132,960
648
100
10
Table 8 lists the HDSL2 responses by case number to both
LTPH-UM-1214-02
H2TU-C-388 List 7F