XRT75R12D_06 Datasheet, PDF (85/134 Pages) Exar Corporation – TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET

XRT75R12D
REV. 1.0.1 TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
CHANNEL CONTROL REGISTER - CHANNEL N ADDRESS LOCATION = 0XM6
BIT NUMBER
NAME
TYPE
DESCRIPTION
4
RLB_n
R/W Loop-Back Select - RLB Bit - Channel_n:
This READ/WRITE bit-field along with the corresponding LLB_n bit-field is
used to configure a given channel into various loop-back modes ass shown
by the following table.
LLB_n
0
0
1
1
RLB_n
0
1
0
1
Loop-back Mode
Normal (No Loop-back) Mode
Remote Loop-back Mode
Analog Local Loop-back Mode
Digital Local Loop-back Mode
3
LLB_n
R/W Loop-Back Select - LLB Bit-field - Channel_n:
See the table (above) for RLB_n.
2
E3_n
R/W E3 Mode Select - Channel_n:
This READ/WRITE bit-field, along with Bit 1 (STS-1/DS3_n) within this reg-
ister, is used to configure a given channel into either the DS3, E3 or STS-1
Modes.
0 - Configures Channel_n to operate in either the DS3 or STS-1 Modes,
depending upon the state of Bit 1 (STS-1/DS3_n) within this same register.
1- Configures Channel_n to operate in the E3 Mode.
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