Automatic Protection Switching Redundancy; Table 5-11 Bxm Sonet Aps - Cisco BPX-BXM-155-8DX Installation And Configuration Manual

Automatic Protection Switching Redundancy

Automatic Protection Switching Redundancy
Automatic Protection Switching (APS) provides a standards-based line-redundancy for BXM OC-3 and
OC-12 cards. The BXM OC-3 and BXM OC-12 cards support the SONET APS 1+1 and APS 1:1
standards for line redundancy. Line redundancy is provided by switching from the working line to the
protection line.
The APS protocols supported by the BXM are listed in Table 5-11:

Table 5-11 BXM Sonet APS

APS 1:1 redundancy provides line redundancy only and is supported with the standard BXM OC-3 and
OC-12 front and back cards.
APS 1+1 redundancy provides both card and line redundancy. It uses the standard BXM OC-3 and
OC-12 front cards, but uses a special APS Redundant Frame Assembly and APS Redundant backcards.
A backcard is shown in (Figure 5-10). The APS Redundant Frame Assembly is shown in (Figure 5-11).
Two redundant backcards are connected together by the APS Redundant Frame Assembly. The APS
Redundant Frame Assembly with associated APS redundant backcards is inserted as a unit in two
appropriate backcard slots.
Refer to Chapter 26, Configuring SONET Automatic Protection System, for additional information.
Cisco BPX 8600 Series Installation and Configuration
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APS 1+1 The APS 1+1 redundancy provides card and line redundancy, using the same
numbered ports on adjacent BXM backcards.
APS 1:1 The APS 1:1 redundancy provides line redundancy, using adjacent lines on
the same BXM backcard.
Chapter 5 BXM Card Sets: T3/E3, 155, and 622
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001