
XRT86SH328
PRELIMINARY
266
28-CHANNEL DS1/E1 FRAMER/LIU WITH DS3 MUX & VT-MAPPER - SONET APPLICATIONS
REV. P1.0.6
`
1 = Configures the Transmit DS1 Framer block to transmit DS1 data with erred CRC values.
N
OTE
:
The Transmit DS1 Framer block will transmit DS1 data, with erred CRC values, for the duration that this bit-field
is set to 1.
BIT 5 - Set J1 Mode:
This READ/WRITE bit-field, along with BIT6 (Set T1 Mode) within the T1/E1 Framer Block - Clock Select Register
(Address = 0xN100) is used to configure the Channel to operate in the J1 Mode.
BIT 4 - One & Only:
BIT 3 - Fast Sync:
BIT [2:0] - DS1 Framing Format Select[2:0]:
These three READ/WRITE bit-fields is used to select the Framing format that the DS1 Framer Channel will operate ini.
BIT7 - Yellow Alarm - One Second Rule:
This READ/WRITE bit-field is used to configure the Transmit DS1 Framer to transmit the RAI (or Yellow Alarm) indicator
per the One Second Rule (as described in the ANSI standards).
Transmission of the RAI Indicator per the One Second Rule
If the user invokes the One Second Rule, then the following will happen.
Whenever the Transmit DS1 Framer block generates and transmits the RAI indicator, it will do so for at least
one second (for both the ESF and the SF framing formats)
The Relationship between the States of the Set T1 Mode and the Set J1 Mode bit-fields and the
Corresponding Mode of Channel
S
ET
J1 M
ODE
S
ET
T1 M
ODE
(BIT6
IN
0
X
N100)
O
PERATING
M
ODE
OF
C
HANNEL
0
0
E1 Mode
0
1
T1 Mode
1
0
E1 Mode
1
1
J1 Mode
The Relationship between the state of the DS1 Framing Format Select[2:0] bits and the
resulting Framing format of the channel
DS1 F
RAMING
F
ORMAT
S
ELECT
[2:0]
R
ESULTING
F
RAMING
F
ORMAT
0XX
DS1, ESF - Extended Super-Frame
100
Do Not Use
101
DS1, SF - Super-Frame
11X
Do Not Use
T
ABLE
398: T1 F
RAMER
B
LOCK
- A
LARM
G
ENERATION
R
EGISTER
(A
DDRESS
= 0
X
N108,
WHERE
N
RANGES
IN
VALUE
FROM
0
X
01
TO
0
X
38)
BIT7
BIT6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Yellow Alarm
- One Sec-
ond Rule
Transmit Yel-
low Alarm
Yellow Alarm Format[1:0]
Transmit AIS Pattern
Select[1:0]
AIS Defect Declaration Cri-
teria[1:0]
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0