S/UNI®-ATLAS-3200 Telecom Standard Product Data Sheet
Preliminary
Figure 20 Connection of S/UNI-ATLAS-3200 BCIFs
Ingress Direction
UTOPIA or POS-PHY (Level 3)
Ingress Mode S/UNI-ATLAS-3200 (+SRAM)
IBCIF
OBCIF
16 bit SCI PHY
(Backward Cell Interface)
OBCIF
IBCIF
Egress Mode S/UNI-ATLAS-3200 (+SRAM)
Egress Direction
In addition to RDI, Bwd PM, and LB cells, there are bits to route entire VCs, System
Management cells, or undefined OAM cells to the BCIF. These options permit the BCIF
interface to be connected to a tester for debug purposes, or to an ASIC for external processing of
certain cells (so long as the RDI, BwdPM, and LB cells are passed on to the opposite direction
ATLAS). In order to allow cells to be inserted in the reverse direction, the S/UNI-ATLAS-3200
prepends routing information stored in the VC table onto the cell. This information consists of
the PHYID and Backwards Direction VCRA fields from the VC table. The cell format, which is
always a 64-byte cell, is shown in Table 38.
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-1990553, Issue 4
135
PMC [ PMC-SIERRA, INC ]
