P300H
P300 Series Modem Installation and Operating Handbook
Page 106
operation with a PCM bearer which supports CRC (T1-ESF or G.732). When
appropriate this accesses a sub menu which is discussed in the following
section.
ÌÈñÜÎÑÐ ÞÛÎ
The source for the estimate of the terrestrial BER at the Drop Mux may be
selected:
ß«¬±
The selection is made automatically from the most appropriate
source.
ÚßÉ
The
input
BER is estimated from the Frame Alignment Words
(FAW) of the PCM bearer.
ÝÎÝ
The
input
BER is estimated from the number of CRC errors
(T1-ESF & G.732 only).
ÛóÞ·¬-
The
output
BER is determined by counting the E-Bits on the
incoming
G.732 signal. On a G.732 link an E-Bit is returned by
the distant equipment when it receives an errored CRC, ie
the incoming E-Bits represent the error rate at the far end of
this modems outgoing G.732 link.
Effectively the error rate
on the outgoing link at the far end.
Default:
ß«¬±
ÎÈñ×ÒÍÛÎÌ ÞÛÎ
The source for the estimate of the BER
from
the terrestrial port at the input to
the insert mux may be selected as described above for the Tx/Drop BER.
Default:
ß«¬±
6.10.5 Change, User-Opt, Operation, Terrestrial, PCM BEARER CRC Menu
PCM Bearer: 1:Bearer CRC
2:E-Bits 3:CRC/Frame Acq'
Change, User-Opt, Operation, Terrestrial, PCM Bearer CRC Menu
ÞÛßÎÛÎ ÝÎÝ
This option, only applicable to G.732 Drop/Insert bearers selects if the PCM
bearer has a CRC, the options available are
Ò±²»ñ×¹²±®»
or
Ю±½»--
.
Default:
Ò±²»ñ×¹²±®»
.
ÛóÞ×ÌÍ
If a G.732 Bearer with CRC set to
Ю±½»--
as above, then the additional option
to process & return E-Bits is also available, options for what happens when
incoming CRC errors are detected are
Ò± ß½¬·±²
or
묫®² ÛóÞ·¬
.
Default:
Ò± ß½¬·±²
.
ÝÎÝñÚÎßÓÛ
ßÝÏù
Again, if a G.732 Bearer with CRC set to
Ю±½»--
, then the option exists to
implement the strict letter of ITU G.704, and force a re-acquisition of the
terrestrial Drop/Insert frame sync if CRC sync cannot be achieved within 8ms.
Options available are
Ò±®³¿´
or
λ¿½¯«·®» º®¿³» ·º ÝÎÝ -§²½ ´±-¬
.
Default:
Ò±®³¿´
.
6.10.6 Change, User-Opt, Operation, SATELLITE Menu
Satellite: 1:BER est 2:IBS MF period
3:Carrier ID s 4:Back alm map 5:IF-50/75
Change, User-Opt, Operation, Satellite Menu
