XRT72L13 datasheet(44/370 Pages) EXAR

44 / 370 page

XRT72L13

áç

M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

REV. P1.0.6

PRELIMINARY

181

RLOOP

Remote Loopback Output Pin (to the XRT7300 DS3/E3 Line Inter-

face Unit IC).

This output pin is intended to be connected to the RLOOP input pin of

the XRT7300 DS3/E3 Line Interface Unit IC. The user can command

this signal to toggle "high" and, in turn, force the XRT7300 DS3/E3

Line Interface Unit IC into the "Remote Loopback" mode. Conversely,

the user can command this signal to toggle "low" and allow the

XRT7300 to operate in the normal mode. (For a detailed description

of the XR-T7300 DS3/E3 Line Interface Unit IC's operation during

Remote Loopback, please see the XR-T7300 DS3/STS-1/ E3 Line

Interface Unit IC's Data Sheet).

Writing a "1" to bit 1 of the "Line Interface Drive Register (Address =

0x80) will cause this output pin to toggle "high". Writing a "0" to this

bit-field will cause the RLOOP output to toggle "low".

NOTE: This output pin can be used for a variety of other purposes if

the XRT7300 DS3/E3 LIU is not used.

182

LLOOP

Local Loopback Output Pin (to the XRT7300 DS3/E3 Line Inter-

face Unit IC).

This output pin is intended to be connected to the LLOOP input pin of

the XRT7300 LIU IC. The user can command this signal to toggle

"high" and, in turn, force the LIU into the "Local Loopback" mode.

(For a detailed description of the XRT7300 DS3/E3 Line Interface Unit

IC's operation during Local Loopback, please see the XRT7300 DS3/

STS-1/E3 Line Interface Unit IC's Data Sheet).

Writing a "1" to bit 1 of the "Line Interface Drive Register (Address =

0x80) will cause this output pin to toggle "high". Writing a "0" to this

bit-field will cause the RLOOP output to toggle "low".

NOTE: This output pin can be used for a variety of other purposes if

the XRT7300 DS3/E3 LIU is not used.

183

DMO

"Drive Monitor Output" Input (from the XRT7300 DS3 Line Inter-

face Unit IC).

This input pin is intended to be tied to the DMO output pin of the

XRT7300 DS3 Line Interface Unit IC. The user can determine the

state of this input pin by reading Bit 2 (DMO) within the Line Interface

Scan Register (Address = 0x81). If this input signal is "high", then it

means that the drive monitor circuitry (within the XRT7300 DS3 Line

Interface Unit IC) has not detected any bipolar signals at the MTIP

and MRING inputs within the last 128 ± 32 bit-periods. If this input

signal is "low", then it means that bipolar signals are being detected at

the MTIP and MRING input pins of the XRT7300.

NOTE: This output pin can be used for a variety of other purposes if

the XRT7300 DS3/E3 LIU is not used.

PIN DESCRIPTIONS

PIN #NAME

TYPE

DESCRIPTION

XRT72L13 Datasheet(PDF) 44 Page - Exar Corporation

XRT72L13 Datasheet(HTML) 44 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