STANDARD PRODUCT
PM4351 COMET
DATA SHEET
PMC-1970624
ISSUE 10
COMBINED E1/T1 TRANSCEIVER
PROPRIETARY AND CONFIDENTIAL
191
Register 054H: T1 XBAS Configuration
Bit
Type
Function
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
MTRK
JPN
B8ZS
ESF
FMS1
FMS0
ZCS1
ZCS0
0
0
0
0
0
0
0
0
When the E1/T1B bit of the Global Configuration register is a logic 1, this register
is held reset.
MTRK:
The MTRK bit forces trunk conditioning, idle code substitution and signaling
conditioning, on all channels when MTRK is a logic 1. This has the same
effect as setting the IDLE_DS0 bit in the PCM Control byte and the SIG0 bit
in the SIGNALING Control byte for all channels.
JPN:
The JPN bit enables Japanese variations of the standard framing formats. If
the JPN bit is a logic 1 and the ESF format is selected (ESF bit is logic 1), the
XBAS complies to TTC JT-G704. If the JPN bit is a logic 1 and the SF format
is selected, the framing bit of frame 12 is forced to logic 1 when a Yellow
alarm is declared. Otherwise, bit 2 in all of the channels is forced to logic 0 to
indicate Yellow alarm. Framing insertion must be enabled in order to transmit
the alternate SF Yellow alarm.
B8ZS:
The B8ZS bit enables B8ZS line coding when it is a logic 1. When the B8ZS
bit is a logic 0, AMI coding is used.
ESF, FMS1, FMS0:
The ESF bit selects either Extended Superframe format or enables the
Frame Mode Select bits (FMS) to select either regular superframe, T1DM or
SLC96 framing formats. The mode is encoded as follows: