XRT86VL30 datasheet(83/188 Pages) EXAR

83 / 188 page

XRT86VL30

REV. 1.0.0

SINGLE T1/E1/J1 FRAMER/LIU COMBO - E1 REGISTER DESCRIPTION

1.1

E1 Synchronization status message

E1 synchronization messages are sent through the National Bits (Sa4, Sa5, Sa6, Sa7, or Sa8) bits or the Si

International bit by using a BOC (Bit Oriented Code) controller within the XRT86VL30 device. The MSB of the

BOC code is sent first in frame 2 of the CRC multi frame. The SSM message that are used in typical BITS

applications are shown below.

1.2

E1 BOC Receiver

If enabled, the E1 BOC receiver will monitor the National bits or the Si bit for SSM messages with various

features being supported. Some of these features are Change of Status Alarm, 3 independent pre-set codes

for matching validation (each having its own alarm), filter settings for consecutive pattern qualification, and

many more.

1.3

E1 BOC Transmitter

The E1 BOC transmitter will automatically insert an SSM message in the correct National bit or Si bit that is

selected. Once the message is stored in the TSSM register, Bit 0=1 sends the message.

TABLE 62: E1 SSM MESSAGES

QUALITY LEVEL

DESCRIPTION

BOC CODE

Quality unknown (existing sync network)

0000

Reserved

0001

Rec. G.811 (Traceable to PRS)

0010

Reserved

0011

SSU-A (Traceable to SSU type A, see G.812)

0100

Reserved

0101

Reserved

0110

Reserved

0111

SSU-B (Traceable to SSU type B, see G.12)

1000

Reserved

1001

Reserved

1010

Synchronous Equipment Timing Source

1011

Reserved

1100

Reserved

1101

Reserved

1110

Do not use for synchronization

1111

XRT86VL30 Datasheet(PDF) 83 Page - Exar Corporation

XRT86VL30 Datasheet(HTML) 83 Page - Exar Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL