IDM-30FNV4 Multi-service Video Optical Multiplexer

The 20 km single-mode wide-temperature multi-service optical multiplexer is a site-side device that multiplexes 4-channel video, 8 groups of transparent transmission E1 channels, Ethernet, and voice/data services onto a pair of optical fibers for transmission, and is a typical multi-service optical multiplexer product. The IDM-30FNV4 multi-service video optical multiplexer is developed by Beijing Ruiguang Jiyuan Digital Technology Co., Ltd. (Raytrans). As a professional optical multiplexer manufacturer, the product adopts a 19-inch 1U standard chassis design, supports 4-channel all-digital uncompressed video transmission, encodes video digitally at 8bit onto the fiber, and is compatible with PAL, NTSC, and SECAM video formats; while providing 8 groups of transparent transmission E1 channels, it supports 2 groups of shared line-rate 100M Ethernet access with VLAN partitioning, and provides 30 channels of 64K or n×64K rate voice, data, image, and more than 20 types of subscriber interfaces. The video optical multiplexer device has a standard configuration of 20 km single-mode transmission distance and an operating temperature of -30℃ to +50℃, providing integrated multi-service access for service backhaul over medium-to-long span, weak optical links in electric power private networks, rail transit, and border and coastal defense unattended sites, and can be widely used in scenarios such as government private network optical fiber communication solutions and military emergency communications vehicle solutions. As a product showcase combining PDH optical multiplexer and video optical multiplexer, this optical multiplexer has strong service integration capability among similar products.

Key Specifications at a Glance: 20 km single-mode · 155Mbps · sensitivity -21dBm · -30~+50℃ · 8 groups of E1 transparent transmission · 2-channel VLAN 100M · 30-channel 64K service · 19-inch 1U chassis 440×230×45mm · overall power consumption ≤40W · power supply AC220V/DC-48V/DC 9V

What kind of device is the 20 km single-mode wide-temperature multi-service optical multiplexer

The 20 km single-mode wide-temperature multi-service optical multiplexer is a multi-service optical multiplexer that converges four types of services—video, E1, Ethernet, and voice/data—onto a pair of optical fibers, so that the site side only occupies one 1U slot to simultaneously provision the four types of services. The Raytrans IDM-30FNV4 multi-service video optical multiplexer is designed according to this approach, with functional units divided by service type inside the chassis, respectively undertaking video backhaul, E1 transparent transmission, Ethernet access, and voice/data access tasks, so that the site side does not need to deploy standalone devices for each type of service, and cabinet space, cabling quantity, and points of failure are reduced accordingly. As a professional optical multiplexer manufacturer, Raytrans clearly indicates the device's service aggregation capability in its product showcase.

Traditional private network sites usually select models separately by service: video runs over coaxial cable or a video optical multiplexer, E1 trunk runs over a PDH optical multiplexer, and voice and low-speed data run over a PCM multiplexer, with the three types of devices each occupying a slot and each using a pair of optical fibers. The IDM-30FNV4 multi-service video optical multiplexer multiplexes video, E1, Ethernet, and 30-channel 64K services onto the same pair of optical fibers for transmission, with video transmitted onto the fiber in all-digital uncompressed mode, E1 channels transparently transmitted without changing the original service content, Ethernet access capable of VLAN partitioning, and voice and data services allocated at 64K or n×64K rates, with 8 groups of E1 transparent transmission channels and 30-channel 64K services running in parallel on the same pair of optical fibers. This design approach has practical deployment value in both government private network optical fiber communication solutions and military emergency communications vehicle solutions.

The video channel adopts 8bit digital encoding, with a video sampling bit width of 8bit, a video bandwidth of 0Hz~6.5MHz, luminance non-linearity <3%, differential phase (DP) <0.7°, differential gain (DG) <0.7%, and a video SNR ≥70dB (weighted). After digitization, the video signal is transmitted directly over the optical fiber, and there is no electromagnetic interference (EMI) or radio frequency interference (RFI) on the link, making it suitable for picture backhaul in strong electromagnetic environments such as substations and traction substations.

Figure 1: IDM-30FNV4 multi-service video optical multiplexer front panel and operating indicator LEDs

What functions are integrated into one 1U chassis

The IDM-30FNV4 multi-service video optical multiplexer performs multiplexing and transmission of video, E1, Ethernet, and voice/data services within a 19-inch 1U chassis, with the main functions shown in the table below. The number of channels for each type of service is configured according to the on-site service list, and the interface type is selected according to the access device.

Function	Description
4-channel uncompressed video transmission	Supports 4-channel all-digital uncompressed video transmission, with video encoded digitally at 8bit onto the fiber without going through compression encoding and decoding, so that picture detail and the synchronization relationship among multiple services are not affected
Video format compatibility	Compatible with PAL, NTSC, and SECAM video formats, so front-end cameras do not require additional format conversion equipment
8 groups of E1 transparent transmission channels	Provides 8 groups of E1 transparent transmission channels, with E1 services extended to the opposite end in transparent transmission mode, while the original frame structure and time slot division are maintained
2 groups of VLAN Ethernet	Provides 2 groups of shared line-rate 100M Ethernet interfaces with VLAN partitioning, interface type RJ-45, transmission rate 10M/100M adaptive, supporting the IEEE802.3 standard protocol, with operating mode full/half duplex/adaptive
30-channel 64K service access	Provides 30 channels of 64K or n×64K rate voice, data, image, and other services, configurable with more than 20 types of subscriber interfaces, with the number of channels allocated according to the on-site service list
Data interface access	Data interfaces support RS-232, RS422 (4-wire), and RS485 (2-wire), interface type RJ-45, and can connect to acquisition terminals and control devices
Wide temperature operation and three power supplies	Operating temperature -30℃ to +50℃, supporting three power supply modes AC220V/DC-48V/DC 9V, suitable for outdoor cabinets and in-station DC power supplies
High integration	19-inch 1U standard chassis, dimensions 440×230×45mm (Length×Depth×Height), overall power consumption ≤40W

Figure 2: IDM-30FNV4 multi-service video optical multiplexer rear panel BNC video ports, FC optical ports, and E1/Ethernet interfaces

How to calculate the optical interface and 20 km transmission distance

The optical interface of the IDM-30FNV4 multi-service video optical multiplexer adopts the FC type, and interfaces such as SC can be customized according to project requirements, with the transmit and receive ends used in pairs; the standard configuration has a single-mode transmission distance of 20 km, and beyond this distance a long-distance optical module can be installed to extend it. The optical interface specifications are shown in the table below. In engineering design, the link margin is calculated based on the transmit optical power, receiver sensitivity, and actual optical fiber attenuation.

Item	Parameter/Specification	Description/Applicable Conditions
Interface type	FC (SC and others customizable)	Optical patch cord interfaces are selected according to the on-site optical cable termination method
Fiber mode	Single-mode (multi-mode optional)	20 km single-mode transmission configuration
Receiver receive/transmit rate	155Mbps/155Mbps	Nominal rate of the optical link, carrying 155Mbps uncompressed video backhaul
Receiver receive/transmit wavelength	1310nm/1550nm	Transmit and receive dual-wavelength pairing
Transmitter receive/transmit rate	155Mbps/155Mbps	Consistent with the opposite end rate
Transmitter receive/transmit wavelength	1550nm/1310nm	Paired with the opposite end wavelength
Transmit optical power	-15～-8dBm	Output optical power on the transmit side
Receiver sensitivity	Better than -21dBm	Receiver sensitivity specification for weak optical links, enabling normal reception on long-distance links and legacy optical fiber private networks
Transmission distance	20Km	A long-distance optical module can be optionally installed to achieve longer-distance optical fiber transmission

The difference between the transmit optical power (-15～-8dBm) and the receiver sensitivity (better than -21dBm) is about 13dB (calculated at -8dBm and -21dBm), and this margin is used to offset optical cable attenuation, splice point, and mating connector loss. During on-site design, the receiving-end optical power is calculated based on the actual optical cable length, attenuation coefficient, and number of connectors, with a maintenance margin reserved; when the link length exceeds 20 km, installing a long-distance optical module or adding an optical repeater can extend the transmission distance. As an optical multiplexer manufacturer, Raytrans performs link calculation according to this method in both government private network optical fiber communication solutions and military emergency communications vehicle solutions.

Video interface parameters and picture quality specifications

The video interface adopts the BNC type, with input/output impedance 75Ω (unbalanced), and directly connects to conventional cameras and monitors. Picture quality is determined jointly by sampling bit width, bandwidth, and distortion specifications, with the parameters shown in the table below.

Item	Parameter/Specification	Description/Applicable Conditions
Interface type	BNC	Video interface on the camera and monitor side
Video sampling bit width	8bit	All-digital uncompressed sampling precision
Video bandwidth	0Hz~6.5MHz	Covers the standard definition video baseband bandwidth
Luminance non-linearity	<3%	Picture luminance distortion specification
Differential phase (DP)	<0.7°	Chrominance signal phase distortion specification
Differential gain (DG)	<0.7%	Chrominance signal amplitude distortion specification
Input overload voltage	1.5VP-P (typical)	Non-saturation voltage at the input
Input/output voltage	1VP-P (typical)	Standard video signal level
Input/output impedance	75Ω (unbalanced)	Impedance matching with conventional video equipment
Video SNR	≥70dB (weighted)	Weighted measurement basis, reflecting the picture noise level

Ethernet, voice, and data interface parameters

The Ethernet interface is of the RJ-45 type, 10M/100M adaptive, and can be connected once negotiated between the port and the opposite end device; voice and data services are allocated at 64K or n×64K rates, and the voice codec adopts ITU-T G.711 A-law. As a mature product of a professional optical multiplexer manufacturer, Raytrans provides a rich set of interface configurations in its product showcase for this series.

Item	Parameter/Specification	Description/Applicable Conditions
Number of Ethernet channels	2 groups	The two groups each share line-rate 100M bandwidth and can be partitioned into VLANs
Ethernet interface type	RJ-45	Connects to switches, network cameras, and other devices
Transmission rate	10M/100M adaptive	Adaptive to the access network rate
Standard protocol	Supports IEEE802.3	Compatible with general Ethernet devices
Operating mode	Full/half duplex/adaptive	Negotiated with the opposite end device
Voice service capacity	30-channel 64K or n×64K	Voice, data, image, and other services totaling 30 channels
Audio range	300Hz～3400Hz	Telephone voice bandwidth
Compression	ITU G.711 A-law	Voice encoding method
Impedance	Three-element complex impedance 200Ω+560Ω//0.1μF	Matched with the SPC exchange and telephone side
Loop current	25mA/channel	Power feeding current per telephone channel
Data interface type	RJ-45	Data port on the device side
Data type	RS-232, RS422 (4-wire), RS485 (2-wire)	Selected according to the interface type of on-site control and acquisition devices

Power consumption, environment, and structural parameters

The four specifications of power supply, power consumption, environment, and structure determine whether the optical multiplexer can be deployed in outdoor cabinets and unattended equipment rooms, with the parameters shown in the table below. The device supports three power supply modes, and one of them can be selected according to on-site power conditions.

Item	Parameter/Specification	Description/Applicable Conditions
Power supply mode	AC220V/DC-48V/DC 9V	Selected according to equipment room and on-site power conditions
Overall power consumption	≤40W	Overall operating power consumption when simultaneously carrying video, E1, Ethernet, and voice/data services
Operating temperature	-30℃～+50℃	Suitable for outdoor cabinets and equipment rooms with large temperature differences
Relative humidity	0～95% (non-condensing)	Applicable condition in high-humidity environments is non-condensing
Product dimensions	440×230×45mm (Length×Depth×Height)	19-inch 1U standard chassis

Typical Application Scenarios

The sites suited to the IDM-30FNV4 multi-service video optical multiplexer share a common set of characteristics: distributed sites, long inter-station distances, and tight fiber core counts, while video, trunk, network, and voice services must all be sent back together, and many of these sites sit on weak optical links or on old optical cables that have been in service for many years. Four indicators—transmission distance, receiver sensitivity, operating temperature, and power supply mode—determine whether an optical multiplexer can operate at these sites over the long term.

Electric Power Private Network

At substations, distribution rooms, and new energy stations, cameras, dispatch telephones, and protection channels are distributed across different sites, the inter-station distance often exceeds the range of cable transmission, and the station interior is a strong electromagnetic environment. The IDM-30FNV4 multi-service video optical multiplexer uses a pair of optical fibers to send back 4-channel video, 8 groups of transparent E1, 2 groups of VLAN Ethernet, and 30-channel 64 kbit/s service to the centralized control station or dispatch center: the video channel carries picture backhaul in 8-bit uncompressed mode, and the link is free from electromagnetic interference (EMI) and radio frequency interference (RFI); the E1 channel is used for channel extension of protection and automation services, and the telephone channel is used for inter-station dispatching calls. The -30℃～+50℃ operating temperature and DC-48V power supply mode suit outdoor cabinets and unattended sites, and DC power can be taken directly inside a substation. The government private network optical fiber communication solution that Raytrans offers for the electric power industry has been deployed in a number of substation projects.

Rail Transit

Along a rail transit line, stations, section equipment rooms, tunnel portals, and depots are far apart with scattered sites, and communication services include video surveillance, dispatch telephones, broadcast, and device status data. The 20Km single-mode transmission and receiver sensitivity better than -21dBm of the IDM-30FNV4 multi-service video optical multiplexer cover the typical distance between adjacent stations, and the link remains stable even when the attenuation of old optical cables laid along the line in the early years is relatively high; the E1 channel is used for inter-station service trunking, the 2 groups of Fast Ethernet with VLAN partitioning carry video and device data respectively, the 30-channel 64 kbit/s channels take on telephone and broadcast services, and a pair of optical fibers along the line is enough to support access for multiple types of services.

Border and Coastal Defense and Unattended Sites

Border and coastal defense posts, unattended equipment rooms, and remote monitoring sites usually have no air conditioning and no permanently stationed personnel, and both the power supply conditions and the temperature difference are relatively harsh, while on-duty personnel need to see the on-site picture and maintain calls at the central end. The IDM-30FNV4 multi-service video optical multiplexer suits such sites with its -30℃～+50℃ operating temperature, 0～95% (non-condensing) relative humidity, and ≤40W overall power consumption, and its three power supply modes—AC220V, DC-48V, and DC 9V—can interface with mains power, in-station DC power, and a small power supply respectively. A wide-temperature optical multiplexer at an unattended site also needs to send back pictures, telephone, and collected data together; the device uses a pair of optical fibers to carry 4-channel video, 8 groups of E1, and 30-channel 64 kbit/s service, and the central end can check the device operating status online through the network management functions. For mobile deployment needs such as the military emergency communications vehicle solution, the combined solution of a PDH optical multiplexer and a multi-service optical multiplexer is equally applicable.

Figure 3: Schematic of single-fiber point-to-point networking of video, E1, Ethernet, and PCM on the IDM-30FNV4 multi-service video optical multiplexer

Differentiated Value

Differentiated Capability	Technical Support	On-Site Value
20Km single-mode: a pair of optical fibers covers long spans between sites	Standard configuration with a single-mode transmission distance of 20Km; long-distance optical modules can be optionally installed for extension	Long-span link sites of a field private network are directly connected with a pair of optical fibers; beyond 20Km, long-distance optical modules can be swapped in for extension without changing service interfaces
155Mbps: all-digital uncompressed video onto the fiber	Video is transmitted over a 155Mbps optical link in 8-bit digital encoding, with a video SNR ≥70dB (weighted)	155Mbps uncompressed video backhaul; the picture does not go through compression and encoding/decoding, so surveillance picture quality does not degrade
Sensitivity -21dBm: stable operation even on weak optical links	Receiver sensitivity better than -21dBm, transmit optical power -15～-8dBm	Suited to long-distance links and old optical fiber private networks that have been in service for many years with relatively high attenuation, with more ample link margin
-30~+50℃: wide temperature operation and three power supply options	Operating temperature -30℃～+50℃, supporting AC220V/DC-48V/DC 9V power supply, overall power consumption ≤40W	Outdoor cabinets and unattended sites need no air conditioning, and in-station DC power can be taken directly

Summary

The IDM-30FNV4 multi-service video optical multiplexer is a 20Km single-mode wide-temperature multi-service optical multiplexer, belonging to the multi-service optical multiplexer category in the optical multiplexer product line: a pair of optical fibers simultaneously carries 4-channel uncompressed video, 8 groups of transparent E1 channels, 2 groups of Fast Ethernet with VLAN partitioning, and 30-channel 64 kbit/s service; video is transmitted uncompressed over a 155Mbps optical link in 8-bit digital encoding, with a video SNR ≥70dB (weighted); receiver sensitivity is better than -21dBm, suiting long-distance links and old optical fiber private networks; the 19-inch 1U chassis and overall power consumption ≤40W, together with -30℃～+50℃ wide temperature and three power supply options of AC220V/DC-48V/DC 9V, suit electric power private networks, rail transit, and border and coastal defense unattended sites. As a product showcase of a professional optical multiplexer manufacturer, Raytrans has mature solutions in product lines such as video optical multiplexers and PDH optical multiplexers, and can provide government private network optical fiber communication solutions and military emergency communications vehicle solutions. During selection, check the number of interface channels, transmission distance, and power supply mode against the on-site service list; the specific configuration is subject to the manufacturer's technical documentation and commercial confirmation.