Datasheet

53Maxim Integrated

SFP Controller for Dual Rx Interface

DS1877

Table 02h, Register B8h: LOS RANGING

FACTORY DEFAULT 00h

READ ACCESS PW2 or (PW1 and RWTBL2) or (PW1 and RTBL2)

WRITE ACCESS PW2 or (PW1 and RWTBL2)

A2h AND B2h MEMORY Common A2h and B2h memory location

MEMORY TYPE Nonvolatile (SEE)

B8h RESERVED HLOS2

HLOS2

RESERVED LLOS2

LLOS2

BIT 7 BIT 0

This register controls the full-scale range of the QT monitoring for the RSSI2 differential inputs.

BITS 7, 3 RESERVED (default = 0)

BITS 6:4

HLOS2[2:0]: HLOS2 full-scale ranging: 3-bit value to select the full-scale comparison voltage for

high LOS found on RSSI2. Default is 000b and creates a full scale of 1.25V.

HLOS2[2:0] % OF 1.25V FS VOLTAGE (V)

000b 100.00 1.250

001b 80.02 1.0003

010b 66.69 0.8336

011b 50.05 0.6256

100b 40.05 0.5006

101b 33.38 0.4172

110b 28.62 0.3578

111b 25.04 0.313

BITS 2:0

LLOS2[2:0]: LLOS2 full-scale ranging: 3-bit value to select the full-scale comparison voltage for

low LOS found on RSSI2. Default is 000b and creates a full scale of 1.25V.

LLOS2[2:0] % OF 1.25V FS VOLTAGE (V)