ADC PAIRGAIN HiGain HDSL2 Manual page 38

Provisioning
FT1 H2TU-C
Case Option Input
1 ENA SF
2 ENA ESF
3 ENA LOS/AIS
4 ENA LOS/AIS
5 ENA LOS/AIS
(a) Don't care bit
ESF-RAI to SF-RAI Overwrite (ROVR) Option. If the ESF RAI to SF RAI Overwrite (ROVR) option is
enabled, it allows a network ESF RAI or ESF RAI-CI pattern to be converted into a CPE SF RAI or SF RAI-CI
pattern and overwrites bit 2 of every DS0 channel with a zero.
If the ROVR option is disabled, it prevents conversion of a network ESF payload with an embedded RAI pattern.
Disabling the ROVR option preserves the integrity of the CPE payload as it was originally transmitted.
SF-RAI to SF-RAI-CI toward NET (RACI) Option. In general, the Remote Alarm Indication - Customer
Installation (RAI-CI) signal is a RAI signal which contains a signature indicating that an LOF or AIS failure has
occurred within the customer's network.
RAI-CI is transmitted toward the network when these two conditions are simultaneously true at the point from
which RAI-CI is originated (at the H2TU-R, towards the network):
•
RAI is received from the CI
•
No LOF, LOS, or AIS failure is detected in the signal received from the network.
Since RAI-CI meets the definition of RAI, RAI-CI may be detected and used exactly as an RAI.
For ESF, the RAI-CI signal is a repetitive pattern with a period of 1.08 seconds. RAI-CI is formed by sequentially
interleaving 0.99 seconds of the unscheduled message 00000000 11111111 (right-to-left), which represents RAI
in the DL, with 90 milliseconds of the message 00111110 11111111 (right-to-left) to flag the signal as RAI-CI.
For SF, the SF-RAI-CI signal is transmitted inband by setting each of the 24 channel time slots to 1000 1011
(left-to-right). In addition to the criteria specified above, the generation of SF-RAI-CI has to be held for 1 second
to examine the DS0 channels for the presence of a frame with an all-zeroes pattern. If present, the generation of
SF-RAI-CI is suspended for the duration of the all-zeroes pattern.
In all SF environments, the H2TU-R automatically converts a CPE DS1 payload with an embedded RAI signal
into an RAI-CI pattern towards the network if the RACI option is enabled (default). Such a conversion affects the
payload as described above. Disable RACI to avoid this conversion.
The SF-RAI to SF-RAI-CI option is only applicable in an all SF framing environment. If SF to ESF
conversion is active (the CONV option is set to either ACON or FCON), the SF RAI is converted
into ESF RAI in the FDL, regardless of the RACI setting.
28
Table 13. Response of H2TU-C and H2TU-R to LOS and AIS
H2TU-C Output Pattern
Framing Payload FDL
SF 01111110 N/A
ESF 01111110 X
SF 01111110 N/A
SF PL X
SF PL X
April 21, 2000
H2TU-R H2TU-R
Input Output
LOS/AIS 01111110
UNFR
(a)
LOS/AIS 01111110
UNFR
LOS/AIS 01111110
UNFR
(a)
SF/PL AIS
(a)
ESF/PL AIS
152-231-115-03, Revision 03
Front-panel
Status Screen Display
RCV ALRM
RLOS/RAIS RLOS/RAIS
XMT IDLE
RCV ALRM
RLOS/RAIS RLOS/RAIS
XMT IDLE
RCV ALRM
RLOS/RAIS RLOS/RAIS
XMT IDLE
RCV LLOS/LAIS ALRM
LLOS/LAIS
RCV LLOS/LAIS ALRM
LLOS/LAIS
H2TU-C-231 List 1E