IDM-PCM30 Integrated Service Access Device
IDM-PCM30 Integrated Service Access Device: 30 Telephone Channels + 4 E1 + 2 100M Ethernet Ports
The IDM-PCM30 is an integrated service access device launched by Raytrans. A single 19-inch 1U standard chassis simultaneously provides 30 telephone channels, 4 E1 transparent transmission channels, and 2 100M Ethernet ports. Based on the PCM30/32 primary group architecture, it can replace multiple independent access devices and directly interface with existing SDH/PDH transmission networks in the power, mining, and public security sectors, with a typical transmission distance of 30-40 km. For leased-line sites requiring simultaneous uplink of "voice, 2M dedicated line, and Ethernet" services, a single IDM-PCM30 device can complete the access.
IDM-PCM30 Multi-Service in One Unit: One Device Replaces Multiple Access Devices
In the traditional approach, when a site requires 30 telephone channels, 4 E1 lines, and 2 Ethernet ports, telephone optical terminals, E1 multiplexers (or protocol converters), and Ethernet optical terminals typically need to be deployed separately: multiple devices occupy more rack space and power, operations and maintenance require separate inspections and spare parts, and fault localization is more time-consuming.
The IDM-PCM30 integrates all three service types into a single device: 30 telephone channels (FXO/FXS), 4 E1 transparent transmission channels, and 2 100M Ethernet ports, uplinked through a pair of optical fibers. A single 1U device can accomplish the access tasks that previously required 2 to 3 devices, simultaneously reducing rack space, power supply, and maintenance points, making it suitable for sites with limited equipment room space or unattended operation.
Knowledge Block: PCM30/32 Format and Primary Group Architecture
The PCM30/32 format is the PCM primary group (base group) frame structure standard: one frame contains 32 timeslots (TS0 to TS31), where TS0 is used for frame synchronization, TS16 carries channel-associated signaling, and the remaining 30 timeslots (TS1 to TS15, TS17 to TS31) each carry one 64 kbit/s voice channel or 64K data channel. Hence the designation PCM30/32, with "30 telephone channels" corresponding to these 30 service timeslots. The corresponding E1 line code rate is 2048 kbit/s ± 50 ppm, with HDB3 line coding. (Source: IDM-30EN-32 Integrated Service Access Device)
Compatibility with Existing Transmission Networks: E1 Interface Implemented per ITU-T G.703/HDB3
Power, mining, and public security private networks commonly have SDH/PDH transmission networks in place, with 2M channels being readily available resources. The E1 interface of the IDM-PCM30 is implemented per ITU-T G.703 recommendations: HDB3 line coding, 2048 kbit/s ± 50 ppm line rate, 75 Ω unbalanced/120 Ω balanced impedance (an external impedance converter is required when using the 120 Ω balanced interface), PCM30/32 frame structure, and channel-associated signaling. It directly interfaces with standard 2M ports on existing transmission networks, enabling service extension without replacing the peer-end equipment.
For auxiliary interfaces, the Ethernet port complies with IEEE 802.3u, 10/100M half-duplex/full-duplex auto-negotiation, RJ-45, with VLAN partitioning support. The optical interface is 155 Mbps ± 50 ppm, 1310 nm, FC type, with full-link parameters consistent with other integrated service access devices in the same series, facilitating mixed use with existing network resources. (Source: IDM-30EN-32 Integrated Service Access Device)
Long-Distance, Easy Deployment: 30-40 km Transmission and 1U Standard Chassis
The IDM-PCM30 has a typical transmission distance of 30-40 km, covering the common inter-site distances of prefecture-level leased-line networks. The device uses a 19-inch 1U standard chassis, requiring no special modification for rack installation. The FXO/FXS voice ports and 10/100M Ethernet interfaces are plug-and-play, operational immediately after power-on and configuration. Clock modes support master clock/user clock, adapting to different network structures. With function control switches and alarm indicators, on-site personnel can quickly assess device status, making it suitable for long-term operation at unattended sites.
IDM-PCM30 Technical Specifications
| Item | Specification |
|---|---|
| Service Capacity | 30 telephone channels (FXO/FXS) + 4 E1 transparent transmission channels + 2 100M Ethernet ports |
| E1 Interface | ITU-T G.703, HDB3, 2048 kbit/s ± 50 ppm, 75 Ω unbalanced/120 Ω balanced (120 Ω requires external impedance converter), PCM30/32 frame structure, channel-associated signaling |
| FXO/FXS | Impedance 200 Ω + 560 Ω // 0.1 μF, audio 300 Hz to 3400 Hz, ITU G.711 A-law, loop current 25 mA/channel |
| Ethernet | 10/100M half-duplex/full-duplex auto-negotiation, IEEE 802.3u, RJ-45, VLAN partitioning support |
| Optical Interface | 155 Mbps ± 50 ppm, 1310 nm, FC, transmit power -4 to -12 dBm, receive sensitivity better than -34 dBm |
| Transmission Distance | Typical 30-40 km |
| Chassis and Clock | 19-inch 1U standard chassis, master clock/user clock, function control switches + alarm indication |
(Interface specification source: IDM-30EN-32 Integrated Service Access Device)
Typical Application Scenarios: Power, Mining, and Public Security Leased Lines
- Power: Unified access of dispatch telephones and automation 2M channels at substations and distribution stations, with voice and data services sharing a single optical fiber link.
- Mining: Extension of surface dispatch and underground telephones, uplink of production data via E1, reducing equipment stacking in surface equipment rooms.
- Public Security: Co-cable transmission of leased-line voice and networking services at police stations and checkpoint sites, simplifying site access equipment to a single unit.
- Telecom/Banking Leased Lines: Used as a remote access unit for public telephone network access or leased-line information transmission. (Source: IDM-30EN-32 Integrated Service Access Device)
Selection and Deployment Recommendations
When a site simultaneously requires approximately 30 telephone channels, 4 2M channels, and 2 100M Ethernet ports, a single IDM-PCM30 can cover all requirements, making it suitable for replacing multiple independent access devices. Sites with smaller service scales may evaluate other access models in the same series (contact Raytrans for specific model selection confirmation). Deployment notes: the 120 Ω balanced interface requires an external impedance converter; the optical port is FC type, configured with 1310 nm pigtails; for unattended sites, reliable power supply and lightning protection design are recommended (specific configurations subject to the commercial proposal).
Frequently Asked Questions (FAQ)
- How many telephone channels and E1 lines can the IDM-PCM30 transmit simultaneously?
A single IDM-PCM30 device can simultaneously provide 30 telephone channels (FXO/FXS), 4 E1 transparent transmission channels, and 2 100M Ethernet ports. All three service types are uplinked through a pair of optical fibers, with no need to stack additional access devices.
- Can the IDM-PCM30 connect to existing SDH/PDH transmission networks?
Yes. The E1 interface of the IDM-PCM30 is implemented per the ITU-T G.703/HDB3 standard, with a line rate of 2048 kbit/s ± 50 ppm, directly interfacing with standard 2M ports on existing transmission networks without replacing peer-end equipment.
- What is the transmission distance of the IDM-PCM30?
The typical transmission distance is 30-40 km (1310 nm optical port), covering the common inter-site distances of prefecture-level leased-line networks. The actual distance is affected by optical path loss and is subject to on-site survey results.
Conclusion
The IDM-PCM30 carries 30 telephone channels, 4 E1 transparent transmission channels, and 2 100M Ethernet ports in a single 19-inch 1U device. Based on the PCM30/32 primary group architecture, it is compatible with existing SDH/PDH transmission networks, with a typical transmission distance of 30-40 km. It is a viable solution for consolidating access equipment at leased-line sites in the power, mining, and public security sectors. For model selection or networking consultation, contact Raytrans for solution configuration.