Cisco BPX 8650, Installation And Configuration Manual

Page: 452 / 606

25-6
Cisco BPX 8600 Series Installation and Configuration
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Chapter 25 Configuring SONET Automatic Protection System
APS 1+1 (Card and Line Redundancy)
•
BPX-RDNT-SM-155-4 (4 port, medium reach, SMF, SC connector)
• BPX-RDNT-SM-155-8 (8 port, medium reach, SMF, SC connector)
•
BPX-RDNT-SM-622 (single port, medium reach, SMF, FC connector)
•
BPX-RDNT-SM-622-2 (2 port, medium reach, SMF, FC connector)
Each of the listed model numbers includes two single back cards and one mini-backplane (providing
cross coupling of two back cards).
Figure 25-4 APS 1+1 Redundancy, Installing APS Back Cards in APS Redundant Backplane
Traffic protected by APS 1+1 redundancy is carried via the working line and the protection line
simultaneously (see Figure 25-5). Bridging is implemented such that the same payloads are transmitted
identically over the working line as the protection line.
The receiver terminating the APS 1+1 has to select cells from either the working or protection line and
be able to forward one consistent traffic stream. Since both working and protection line transport
identical information, the receiving ends can switch from one to the other without the need for
coordinating with the transmit end.
14
13
12
11
10
7 BCC-A
8 BCC-B
6
9
15 ASM
LMÐ
3/T3
5
4
3
2
1
LMÐ
3/T3
LMÐ
3/T3
LMÐ
3/T3
LMÐ
3/T3
LMÐ
3/T3
LMÐ
3/T3
LMÐ
3/T3
LMÐ
3/T3
LMÐ
3/T3
22901
LMÐ
3/T3
LMÐ
3/T3
BPX-RDNT-BP
redundant
backplane,
common for all
APS backcards
APS
backcards