T8207 Datasheet, PDF (32/158 Pages) Agere Systems – ATM Interconnect

CelXpres T8207
ATM Interconnect
Advance Data Sheet
September 2001
8 Look-Up Table (continued)
s Enable OAM/RM Routing (E). When this bit is ‘1’ in the VPI record and the VCI is less than 32, the routing and
translation information is obtained from the appropriate OAM/RM F4 record. If this bit is ‘1’ in the VCI record and
the most significant bit of the PTI in the cell header is ‘1,’ the routing and translation information is obtained from
the appropriate OAM/RM F5 record. This bit is used only in VPI and VCI records.
s VPI Translation (P). When this bit is ‘1,’ translation is on the VPI only. When this bit is ‘0,’ VPI/VCI translation is
performed. This bit is used only in VPI records.
s VPI Value High (SH). When this bit is ‘1,’ bits 8 through 11 of the incoming VPI are replaced with the correspond-
ing bits in the VPI record. See the truth table (Table 12) below. This bit is used in VPI only translation records.
s VPI Value Low (SL). When this bit is ‘1,’ bits 0 through 7 of the incoming VPI are replaced with the corresponding
bits in the VPI record. See the truth table (Table 12) below. This bit is used in VPI only translation records.
Table 12. VPI Value Truth Table
SH SL
Action
0 0 No VPI translation is performed.
0 1 VPI translation is performed only on bits 0—7 of the incoming VPI.
1 0 VPI translation is performed only on bits 8—11 of the incoming VPI.
1 1 Complete VPI translation is performed.
s OAM Routing Control (C1, C0). These 2 bits determine if the cell is routed as OAM/RM and if VPI/VCI translation
is performed. See the truth table (Table 13) below. These bits are used only in OAM/RM records.
Table 13. OAM Routing Control Truth Table
C1 C0
Action
0 0 Both incoming VPI and VCI are substituted with the VPI¹ and VCI, respectively, in the OAM/RM
record, and the cell is routed according to the cell bus and tandem routing headers in the OAM/RM
record.
0 1 The cell is not routed as OAM/RM. If the record is OAM/RM F5, the cell is translated and routed
according to the cell bus and tandem routing headers in the original VCI record. If the record is OAM/
RM F4, the cell is translated and routed according to the cell bus and tandem routing headers in the
original VPI record.
1 0 The incoming VPI and VCI will be preserved, and the cell is routed according to the cell bus and tan-
dem routing headers in the OAM/RM record.
1 1 Reserved.
1. The most significant 4 bits of the VPI will only be substituted if the global rplc_gfc bit in the direct configuration/control register (address 28h)
is set in UNI mode or if the port is configured in NNI mode.
32
Agere Systems Inc.