Nokia 7210 SAS-M User Manual

7210 SAS-M, T, R6, R12, Mxp, Sx, S Basic System
Configuration Guide
System Management
Edition: 01 3HE 16132 AAAB TQZZA 279
6.5.7 Adaptive Clock Recovery
ACR is a timing-over-packet technology that transports timing information via
periodic packet delivery over a pseudowire. ACR is used when there is no other
Stratum 1 traceable clock available.
There is no extra equipment cost to implement ACR in a network because ACR uses
the packet arrival rate of a TDM pseudowire to regenerate a clock signal. The nodes
in the network that are traversed between endpoints do not need special ACR
capabilities. However, because the TDM pseudowire is transported over Layer 2
links, the packet flow is susceptible to PDV.
Use the following recommendations to achieve the best ACR performance.
10. 1111 (dnu) 1111 (dus) 1111 dnu 00101000 11111111
(st4)
11. 1111 (dnu) 1110 (pno) 1111 (dnu) 01000000 11111111
(pno)
12. 1111 (dnu) 1111 (dus) 1111 (dnu) 00110000 11111111
(dus)
13. 1111 (dnu) 1111 (dus) 1111 (dnu) 00110000 11111111
(dus)
14. 1111 (dnu) 1111 (dus) 1111 (dnu) 00110000 11111111
(dus)
15. 1011 (sec/eec1) 1010 (st3/eec2) 1011 (sec) 00010000 11111111
(st3)
Table 33 Synchronization Message Coding and Source Priorities (Continued)
SSM values to be transmitted by interface of type
Internal Relative
Quality Level
SDH Interface
SyncE interface in
SDH mode
SONET Interface
SyncE interface in
SONET mode
E1 Interface T1 Interface (ESF)
Note:
• Adaptive Clock Recovery (ACR) is supported only with CES MDAs on the 7210 SAS-M
configured in network mode.
• ACR is supported only on the 7210 SAS-M (both ETR and non-ETR variant) configured
in network mode with T1/E1 CES MDAs.

Nokia 7210 SAS-M Specifications

General

Brand	Nokia
Model	7210 SAS-M
Category	Cell Phone
Language	English