
MT9071
Preliminary Information
118
1
LOSE
(0)
Loss of Signal Error Insertion.
If one, the selected framer (Y) transmits an all zeros signal (no
pulses) in every PCM 30 timeslot, and, the HDB3 control bit (see Table 83 - E1 Interrupts and I/
O Control - R/W Address Y02) has no effect. If zero, data is transmitted normally.
Payload Error Insertion.
A zero-to-one transition of this bit inserts a single error in the transmit
payload. A one, zero or one-to-zero transition has no function.
Table 81 - E1 Test, Error and Loopback Control - R/W Address Y01
0
PERR
(0)
Bit
Name
Functional Description
15-8
7
(#### ####) Not Used
TESFY
(0)
Transmit ESF Yellow Alarm.
If one, while in ESF Mode, a repeating pattern of eight 1’s
followed by eight 0’s is sent in the transmit FDL. In addition, this bit must be one if the japan
yellow alarm is to be sent. See control bit JY detailed in Table 78 - T1 Framing Mode
Control - R/W Address Y00
Transmit Secondary Yellow Alarm.
If one, the transmit secondary D4 yellow alarm is sent
which causes the S bit for transmit frame 12 to be set.
Transmit D4 Yellow Alarm.
If one, bit 2 of all DS0 channels is forced low.
6
TXSECY
(0)
TD4Y
(0)
TAIS
(1)
(#)
TT1DMY
(1)
D4SECY
(0)
5
4
Transmit All Ones.
if zero, this control bit forces a framed or unframed (depending on the
state of Transmit Alarm Control bit 0) all ones to be transmit at TTIP and TRING.
Not Used
Transmit T1DM Yellow Alarm.
If this bit is 0 a T1DM yellow alarm is sent on the 24th
timeslot bit 2.
D4 Secondary Alarm.
Set this bit for trunks employing the secondary Yellow Alarm. The
Fs bit in the 12th frame will not be used for counting errored framing bits. If a one is
received in the Fs bit position of the 12th frame a Secondary Yellow Alarm Detect bit will be
set.
S-bit Override.
If set, this bit forces the S-bits to be inserted as an overlay on any of the
following alarm conditions:
i) transmit all ones
ii) loop up code insertion
iii) loop down code insertion.
Table 82 - T1 Transmit Alarm Control - R/W Address Y02
3
2
1
0
SO
(0)
Bit
Name
Functional Description
15
14
COD1
COD0
(1 0)
Line Coding.
These two coding select bits determine the transmit and receive coding options as
follows:
COD1
COD0
Function
0
0
RZ (Return to Zero, Dual Rail)
0
1
NRZ (Non-return to Zero, Single Rail)
1
0
NRZB (Non-return to Zero, Dual Rail) - Default
1
1
no function
This is normally set to zero.
HDB3 (High Density Bipolar 3) RX decoding.
If zero, HDB3 decoding is enabled in the receive
direction. If one, AMI (Alternate Mark Inversion) signal without HDB3 encoding is enabled in the
receive direction.
Table 83 - E1 Interrupts and I/O Control - R/W Address Y02
13
RHDB3
(0)
Bit
Name
Functional Description