The
VCH-505 PTP Grandmaster Clock Combiner
is designed to provide high-precision frequency and time synchronization in digital telecommunications networks.
Its primary application is as a
precision time server for packet-switched networks
, supporting PTP and NTP. The VCH-505 can also be deployed in SDH networks as a
Transit Node Clock (TNC)
or
Local Node Clock (LNC)
.
Key Features
– synchronization inputs:
10 / 2.048 MHz, BITS (E1), 1 PPS, ToD & 1 PPS, SyncE, and PTPv2 Slave
.
– Synchronization outputs:
10 / 2.048 MHz, 2.048 Mbit/s, BITS (E1), 1 PPS, ToD & 1 PPS, SyncE, and PTP Grandmaster
.
– Continuous monitoring of input synchronization signals using
TE, MTIE, TDEV, Δf/f
parameters.
– Internal DOCXO aging (frequency drift) compensation in Holdover mode (DOCXO+ option).
– Redundant, hot-swappable power supply modules for
100–240 V AC or 36–72 V DC operation
.
– When synchronized to GNSS, the unit complies with
ITU-T G.811
.
– Optional multi-band GNSS receiver providing compliance with
ITU-T G.811.1
.
–
Reference frequency and UTC time combining
in accordance with
ITU-T G.811.1 / G.8272.1
.
– Optional expansion modules:
• 16 additional
2.048 MHz / 2.048 Mbit/s outputs
;
• 4 additional
10 / 2.048 MHz outputs
and 4 additional
1 PPS outputs
;
•
10GbE SFP+
ports (x2).
– Supports
GLONASS, GPS, BeiDou, and Galileo
.
– GNSS
spoofing detection
.
– Compact
1U, 19-inch rack-mount
design.
– Four isolated
1000BASE-X SFP ports
.
– Up to
16 independent PTP/NTP configurations per Ethernet port
, each with its own IPv4 address.
– VLAN tagging support.
– Time reference reception from
GNSS, ToD & 1 PPS, or PTPv2 Slave
.
– Web-based control/monitoring.
– Global multi-user NMS (Linux, PostgreSQL).
Main Technical Specifications
Internal oscillator
:
High-stability DOCXO with a temperature stability of
±5.0 × 10
−11
over the +10 to +70 °C temperature range.
Optional oscillator:
Rubidium oscillator with stability up to
±1.0 × 10
−10
over the −10 to +75 °C temperature range.
Maximum server clock synchronization error relative to UTC
:
±30 ns when synchronized to GPS/GLONASS or an external 1 PPS reference.
Holdover performance after loss of GPS/GLONASS synchronization
, at constant ambient temperature, during the first 24 hours:
– DOCXO:
within ±10 µs.
– Rubidium oscillator:
within ±2 µs
.
– When used with the
VCH-1008C hydrogen maser
in frequency-and-time combiner mode:
3 ns
.
Management interfaces and protocols
: HTTPS, SSH, SNMPv2.
Power supply inputs 1 and 2
: 100–240 V AC or 36–72 V DC, in any combination.
Power consumption
: 40 W max.
MTBF
: at least 120,000 hours
Service life
:20 years.
Operating Conditions
ambient temperature:
+5 to +40 °C
Relative humidity at +25 °C:
up to 95%.
Dimensions (W × H × D):
440 × 32 × 252 mm.
Weight
: 4.2 kg max.
Standards Compliance
The VCH-505 supports or complies with the following telecommunications and networking standards:
ITU-T:
G.703, G.704, G.781, G.811, G.811.1, G.812, G.8261, G.8262, G.8264, G.8272, G.8273.2, G.8265.1, G.8275.1, G.8275.2.
PTP:
IEEE 1588v2.
Ethernet / VLAN:
IEEE 802.1Q, 802.1ad, 802.1p.
NTP / SNTP:
RFC 1059 (NTPv1), RFC 1119 (NTPv2), RFC 1305 (NTPv3), RFC 5905 (NTPv4), RFC 4330 (SNTPv4).
Safety and EMC:
GOST IEC 62368-1-2014
GOST CISPR 32-2015.
PTPv2 Capabilities
The VCH-505 supports IEEE 1588v2 Precision Time Protocol and provides:
–
Master, Slave, and Boundary Clock (Class C)
operating modes.
– Internal time-scale resolution of
5 ns
.
– 4 isolated SFP ports (1000BASE-X).
– 2 isolated 10GbE SFP+ ports option.
– PTP message addressing in
unicast, multicast, and mixed modes
.
–
one-step / two-step
timestamping.
–
one-way / two-way
operation.
– PTP transport over:
• Ethernet Layer 2;
• UDP/IPv4 Layer 3;
– delay measurement using:
•
End-to-End (E2E)
;
•
Peer-to-Peer (P2P)
.
–
Synchronous Ethernet (SyncE)
.
–
Ethernet Synchronization Messaging Channel (ESMC)
messages.
– Support for up to
1,024 PTP clients per port
at a synchronization message rate of up to
128 packets per second
.
Supported PTP Profiles
ITU-T G.8265.1
— unicast, Layer 3
ITU-T G.8275.1
— multicast, Layer 2, SyncE
ITU-T G.8275.2
— unicast, Layer 3, SyncE
Custom profiles based on user-defined combinations of the supported parameters
NTP Server Capabilities
The VCH-505 supports
NTPv3 and NTPv4
in accordance with
IETF RFC 1305 and RFC 5905
.
–
Stratum 1
operation.
– Up to
50,000 NTP clients per port
.
