Symmetricom TimeProvider 5000 User Manual

098-00028-000 Revision F – May, 2012 TimeProvider 5000 User’s Guide 293
Chapter 4 Provisioning
Provisioning PTP
To be fully compliant to the ITU telecom profile, a PTP protocol must support the
mapping between SSM and PTP clockClass as defined in G. 8265.1. The SSM QL
value, defined in ITU-T G.781, is transferred through the Clock Class attribute
carried in PTP Announce messages. This mapping is explicitly defined for
frequency synchronization, but Symmetricom’s implementation assumes it is
applicable to time synchronization. See Table 4-8 and Table 4-9 for Symmetricom’s
implementation of the G.8265.1 SSM-clockClass mapping table.
Table 4-4 shows the compliance of the ITU-8265.1 PTP profile for the TP5000 to the
ITU 8265.1 standard.
Table 4-5 shows the compliance of the Default (multicast) PTP profile for the
TP5000 to IEEE 1588-2008 Annex J.
Table 4-6 and Table 4-7 show the attributes for the proprietary Telecom-2008
(unicast) and Hybrid (multicast-hybrid) PTP profiles, respectively.
Table 4-4. ITU-T G.8265-1 Profile Compliance
Attribute
Default for
ITU-T G.8265-1
Default for
TP 5000
Range for
ITU-T G.8265-1
Range for
TP 5000
clockClass Not defined Not defined 80 to 110 80 to 110
Domain 4 4 4 to 23 0 to 255
Table 4-5. Default Profile (Multicast) Compliance - IEEE1588-2008 Annex J
Attribute
Default for
Annex J
Default for
TP 5000
Range for
Annex J
Range for
TP 5000
clockClass n/a 6, 7, 13, 14, 52, 58, 248
Announce Interval 1 1 0 to +4 -4 to +4
Sync Interval 0 -1 -1 to +1 -7 to +7
Domain 0 0 Not defined 0 to 255
Table 4-6. Telecom-2008 (Unicast) Proprietary Profile
Attribute
Default for TP
5000
Range for TP 5000
clockClass Not defined 6, 7, 13, 14, 2, 58, 248
Domain 4 0 to 255

Symmetricom TimeProvider 5000 Specifications

General

Brand	Symmetricom
Model	TimeProvider 5000
Category	Server
Language	English