PM7346 datasheet(169/419 Pages) PMC

169 / 419 page

PM7346 S/UNI-QJET

DATASHEET

PMC-960835

ISSUE 6

SATURN QUAD USER NETWORK INTERFACE FOR J2, E3, T3

PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND ITS CUSTOMERS’ INTERNAL USE 148

line code violations on the RLCV input. When a logic 0 is written to UNI, the

S/UNI-QJET accepts B3ZS-encoded dual-rail data on RPOS and RNEG.

M3O8:

The M3O8 bit controls the DS3 out of frame decision criteria. When a logic 1

is written to M3O8, DS3 out of frame is declared when 3 of 8 framing bits

(F-bits) are in error. When a logic 0 is written to M3O8, the 3 of 16 framing

bits in error criteria is used, as recommended in ANSI T1.107

MBDIS:

The MBDIS bit disables the use of M-bit errors as a criteria for losing frame

alignment. When MBDIS is set to logic 1, M-bit errors are disabled from

causing an OOF; the loss of frame criteria is based solely on the number of

F-bit errors selected by the M3O8 bit. When MBDIS is set to logic 0, errors in

either M-bits or F-bits are enabled to cause an OOF. When MBDIS is logic 0,

an OOF can occur when one or more M-bit errors occur in 3 out of 4

consecutive M-frames, or when the F-bit error ratio selected by the M3O8 bit

is exceeded.

FDET:

The FDET bit selects the fast detection timing for AIS, IDLE and RED. When

FDET is set to logic 1, the AIS, IDLE, and RED detection time is 2.23 ms;

when FDET is set to logic 0, the detection time is 13.5 ms.

AISPAT:

The AISPAT bit controls the pattern used to detect the alarm indication signal

(AIS). When a logic 1 is written to AISPAT, the AIS detection algorithm checks

that a framed DS3 signal containing the repeating pattern 1010... is present.

The C-bits are checked for the value specified by the AISC bit setting. When

a logic 0 is written to AISPAT, the AIS detection algorithm is determined solely

by the settings of AISC and AISONES register bits (see bit mapping table in

the Additional Configuration Register description).

PM7346 Datasheet(PDF) 169 Page - PMC-Sierra, Inc