7705 SAR Interfaces
132
Interface Configuration Guide
3HE 11011 AAAC TQZZA Edition: 01
Figure 15 MC-APS with Pseudowire Redundancy and ICB
If the active link on the access side fails, MC-APS switchover triggers and
subsequently triggers pseudowire redundancy switchover. A failure on the network
side triggers pseudowire redundancy switchover but not MC-APS switchover. For
detailed information on pseudowire redundancy with ICB protection, refer to
7705 SAR Services Guide, “VLL Services”.
3.2.15.4 K1 and K2 Bytes
The APS protocol uses the K1 and K2 bytes of the SONET/SDH header to exchange
commands and replies between the near end and far end.
The switch priority of a request is assigned by bits 1 through 4 of the K1 byte, as
shown in Table 16.
23495
Standby
Standby
Active
Active
MC-LAG
Optional ICB Spoke SDP
Redundant PWs
MC Protocol
Legend:
BTS/
NodeB
7705 SAR-8
7705 SAR-18
7705 SAR-18
Table 16 K1 Byte Switch Priorities
Bits Condition
1111 Lockout of Protection
1110 Forced Switch
1101 SF - High Priority (not used in 1+1 APS)
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