Nokia 7705 - 6.4.5 Proprietary Clock Recovery (PCR)

Basic System Configuration Guide System Management
Edition: 01 3HE 11010 AAAC TQZZA 229
Table 24 lists the supported timestamp frequencies for each platform and adapter
card.
The timestamp frequency is configured at the adapter card level and is used by all
DCR ports or channels on the supporting platforms and cards. Both ends of a TDM
pseudowire using DCR must be running the same frequency. If a network contains
different types of equipment using DCR, a common frequency must be selected that
is supported by all equipment.
DCR complies with published jitter and wander specifications (G.823, G.824, and
G.8261) for traffic interfaces under typical network conditions and for synchronous
interfaces under specified packet network delay, loss, and delay variance (jitter)
conditions.
6.4.5 Proprietary Clock Recovery (PCR)
PCR is a copper synchronous Ethernet-based, timing-over-packet technology. It is
supported on the Packet Microwave Adapter card on the two copper RJ-45
synchronous Ethernet 1000Base-T Microwave Awareness (MWA) ports (ports 1 and
2) and on a copper SFP Ethernet port (ports 3 and 4).
Table 24 Supported Timestamp Frequencies for DCR-timed Circuits
Timestamp Frequency (MHz)
103.68 77.76 25 19.44
16-port T1/E1 ASAP Adapter
card, version 2
✓ (default) ✓
32-port T1/E1 ASAP Adapter
card
✓ (default) ✓
4-port OC3/STM1 / 1-port
OC12/STM4 Adapter card
✓ (default)
4-port DS3/E3 Adapter card ✓ (default)
7705 SAR-M ✓ (default) ✓✓✓
7705 SAR-A ✓ (default) ✓✓✓
4-port T1/E1 and RS-232
Combination module
✓ (default) ✓✓✓
7705 SAR-X ✓ (default) ✓✓✓