{"id":20735,"date":"2021-08-17T17:25:00","date_gmt":"2021-08-17T17:25:00","guid":{"rendered":"http:\/\/wordpress.vremya-ch.com\/?p=20735"},"modified":"2026-09-03T07:56:39","modified_gmt":"2026-09-03T07:56:39","slug":"vch-505-en","status":"publish","type":"post","link":"http:\/\/wordpress.vremya-ch.com\/index.php\/en\/products-en\/telecommunic-en\/vch-505-en\/","title":{"rendered":"PTP Grandmaster Clock Combiner VCH-505"},"content":{"rendered":"\n
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The VCH-505 PTP Grandmaster Clock Combiner<\/strong> is designed to provide high-precision frequency and time synchronization in digital telecommunications networks.
\nIts primary application is as a precision time server for packet-switched networks<\/strong>, supporting PTP and NTP. The VCH-505 can also be deployed in SDH networks as a Transit Node Clock (TNC)<\/strong> or Local Node Clock (LNC)<\/strong>.<\/p>\n\n\n\n

Key Features<\/strong>
\n\u2013\tsynchronization inputs: 10 \/ 2.048 MHz, BITS (E1), 1 PPS, ToD & 1 PPS, SyncE, and PTPv2 Slave<\/strong>.
\n\u2013\tSynchronization outputs: 10 \/ 2.048 MHz, 2.048 Mbit\/s, BITS (E1), 1 PPS, ToD & 1 PPS, SyncE, and PTP Grandmaster<\/strong>.
\n\u2013\tContinuous monitoring of input synchronization signals using TE, MTIE, TDEV, \u0394f\/f <\/strong>parameters.
\n\u2013\tInternal DOCXO aging (frequency drift) compensation in Holdover mode (DOCXO+ option).
\n\u2013\tRedundant, hot-swappable power supply modules for 100\u2013240 V AC or 36\u201372 V DC operation<\/strong>.
\n\u2013\tWhen synchronized to GNSS, the unit complies with ITU-T G.811<\/strong>.
\n\u2013\tOptional multi-band GNSS receiver providing compliance with ITU-T G.811.1<\/strong>.
\n\u2013\tReference frequency and UTC time combining<\/strong> in accordance with ITU-T G.811.1 \/ G.8272.1<\/strong>.
\n\u2013\tOptional expansion modules:
\n\u2022\t16 additional 2.048 MHz \/ 2.048 Mbit\/s outputs<\/strong>;
\n\u2022\t4 additional 10 \/ 2.048 MHz outputs<\/strong> and 4 additional 1 PPS outputs<\/strong>;
\n\u2022\t10GbE SFP+<\/strong> ports (x2).
\n\u2013\tSupports GLONASS, GPS, BeiDou, and Galileo<\/strong>.
\n\u2013\tGNSS spoofing detection<\/strong>.
\n\u2013\tCompact 1U, 19-inch rack-mount<\/strong> design.
\n\u2013\tFour isolated 1000BASE-X SFP ports<\/strong>.
\n\u2013\tUp to 16 independent PTP\/NTP configurations per Ethernet port<\/strong>, each with its own IPv4 address.
\n\u2013\tVLAN tagging support.
\n\u2013\tTime reference reception from GNSS, ToD & 1 PPS, or PTPv2 Slave<\/strong>.
\n\u2013\tWeb-based control\/monitoring.
\n\u2013\tGlobal multi-user NMS (Linux, PostgreSQL).\n<\/p>\n\n\n\n

Main Technical Specifications<\/strong>
\nInternal oscillator<\/strong>:
\nHigh-stability DOCXO with a temperature stability of \u00b15.0 \u00d7 10\u221211<\/sup><\/strong> over the +10 to +70 \u00b0C temperature range.
\nOptional oscillator:<\/strong>
\nRubidium oscillator with stability up to \u00b11.0 \u00d7 10\u221210<\/sup><\/strong> over the \u221210 to +75 \u00b0C temperature range.
\nMaximum server clock synchronization error relative to UTC<\/strong>:
\n\u00b130 ns when synchronized to GPS\/GLONASS or an external 1 PPS reference.
\nHoldover performance after loss of GPS\/GLONASS synchronization<\/strong>, at constant ambient temperature, during the first 24 hours:
\n\u2013\tDOCXO: within \u00b110 \u00b5s.<\/strong>
\n\u2013\tRubidium oscillator: within \u00b12 \u00b5s<\/strong>.
\n\u2013\tWhen used with the VCH-1008C hydrogen maser<\/strong> in frequency-and-time combiner mode: 3 ns<\/strong>.
\nManagement interfaces and protocols<\/strong>: HTTPS, SSH, SNMPv2.
\nPower supply inputs 1 and 2<\/strong>: 100\u2013240 V AC or 36\u201372 V DC, in any combination.
\nPower consumption<\/strong>: 40 W max.
\nMTBF<\/strong>: at least 120,000 hours
\nService life<\/strong>:20 years.\n\n\n<\/p>\n\n\n\n

Operating Conditions<\/strong>
\nambient temperature:<\/strong> +5 to +40 \u00b0C
Relative humidity at +25 \u00b0C:<\/strong> up to 95%.
\nDimensions (W \u00d7 H \u00d7 D):<\/strong>440 \u00d7 32 \u00d7 252 mm.
\nWeight<\/strong>: 4.2 kg max.\n<\/p>\n\n\n\n

Standards Compliance<\/strong>
\nThe VCH-505 supports or complies with the following telecommunications and networking standards:\nITU-T:<\/strong>\nG.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.
\nPTP:<\/strong>IEEE 1588v2.
\nEthernet \/ VLAN:<\/strong>IEEE 802.1Q, 802.1ad, 802.1p.
\nNTP \/ SNTP:<\/strong>RFC 1059 (NTPv1), RFC 1119 (NTPv2), RFC 1305 (NTPv3), RFC 5905 (NTPv4), RFC 4330 (SNTPv4).
\nSafety and EMC:<\/strong>GOST IEC 62368-1-2014
GOST CISPR 32-2015.\n<\/p>\n\n\n\n

PTPv2 Capabilities<\/strong>
\nThe VCH-505 supports IEEE 1588v2 Precision Time Protocol and provides:
\n\u2013 Master, Slave, and Boundary Clock (Class C)<\/strong> operating modes.
\n\u2013 Internal time-scale resolution of 5 ns<\/strong>.
\n\u2013 4 isolated SFP ports (1000BASE-X).
\n\u2013 2 isolated 10GbE SFP+ ports option.
\n\u2013 PTP message addressing in unicast, multicast, and mixed modes<\/strong>.
\n\u2013 one-step \/ two-step<\/strong> timestamping.
\n\u2013 one-way \/ two-way<\/strong> operation.
\n\u2013 PTP transport over:
\n\u2022 Ethernet Layer 2;
\n\u2022 UDP\/IPv4 Layer 3;
\n\u2013 delay measurement using:
\n\u2022 End-to-End (E2E)<\/strong>;
\n\u2022 Peer-to-Peer (P2P)<\/strong>.
\n\u2013 Synchronous Ethernet (SyncE)<\/strong>.
\n\u2013 Ethernet Synchronization Messaging Channel (ESMC)<\/strong> messages.
\n\u2013 Support for up to 1,024 PTP clients per port<\/strong> at a synchronization message rate of up to 128 packets per second<\/strong>.\n<\/p>\n\n\n\n

Supported PTP Profiles<\/strong>
\nITU-T G.8265.1<\/strong> \u2014 unicast, Layer 3
\nITU-T G.8275.1<\/strong> \u2014 multicast, Layer 2, SyncE
\nITU-T G.8275.2<\/strong> \u2014 unicast, Layer 3, SyncE
\nCustom profiles based on user-defined combinations of the supported parameters\n<\/p>\n\n\n\n

NTP Server Capabilities<\/strong>
\nThe VCH-505 supports NTPv3 and NTPv4<\/strong> in accordance with IETF RFC 1305 and RFC 5905<\/strong>.
\n\u2013 Stratum 1<\/strong> operation.
\n\u2013 Up to 50,000 NTP clients per port<\/strong>.
\n<\/p>\n\n\n\n

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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). […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[70],"tags":[],"_links":{"self":[{"href":"http:\/\/wordpress.vremya-ch.com\/index.php\/wp-json\/wp\/v2\/posts\/20735"}],"collection":[{"href":"http:\/\/wordpress.vremya-ch.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wordpress.vremya-ch.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wordpress.vremya-ch.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/wordpress.vremya-ch.com\/index.php\/wp-json\/wp\/v2\/comments?post=20735"}],"version-history":[{"count":24,"href":"http:\/\/wordpress.vremya-ch.com\/index.php\/wp-json\/wp\/v2\/posts\/20735\/revisions"}],"predecessor-version":[{"id":20778,"href":"http:\/\/wordpress.vremya-ch.com\/index.php\/wp-json\/wp\/v2\/posts\/20735\/revisions\/20778"}],"wp:attachment":[{"href":"http:\/\/wordpress.vremya-ch.com\/index.php\/wp-json\/wp\/v2\/media?parent=20735"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wordpress.vremya-ch.com\/index.php\/wp-json\/wp\/v2\/categories?post=20735"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wordpress.vremya-ch.com\/index.php\/wp-json\/wp\/v2\/tags?post=20735"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}