Manufacturer product photo · E1 protection channel switching device (1U rack-mount)
CPD-100
E1 Protection Channel Switching Device
E1 Protection Channel Switching Device · 2×E1 Primary/Backup · ≤ 1ms Switching · 19″ 1U Rack-Mount
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◆≤ 1ms Chip-Level Switching
◆2×E1 Primary/Backup Channels
◆E1 Bypass Protection
◆19″ 1U Rack-Mount
◆Dual Power "1+1" Hot Backup
◆5-Year Warranty
Overview
The CPD-100 is an E1 protection channel switching device that provides E1 1+1 transmission line protection over a standard 2M transmission channel (G.703), designed to power-utility protection channel standards. It automatically selects the E1 channel with the best signal quality between the primary and backup lines based on on-site line conditions, safeguarding the reliability and security of critical E1 link data transmission. Supporting lossy, lossless, automatic, and manual switching modes, it also provides comprehensive network management that monitors E1 channel signal quality and device status in real time, reporting to the ZJPManager network management platform.
Is This the Right Fit?
Six real deployment scenarios matched to this model's actual datasheet specifications.
E1 Protection Channel Switching for Power Grid Relay Protection2 standard E1 primary/backup channel interfaces plus 1 E1 important-link interface let the device automatically select the E1 channel with the best signal quality — the primary/backup switching foundation that power-grid relay-protection communication channels depend on.
Chip-Level Sub-Millisecond E1 Protection Switching (≤ 1ms)E1 signal-quality monitoring and circuit switching are integrated into a single chip-level design, delivering a switching time ≤ 1ms — the shortest circuit-switching time the device supports, critical where every millisecond of channel interruption matters.
Railway, Pipeline & Mine Dedicated E1 Network ProtectionLOS, LOF, AIS and bit-error-threshold alarms cover the full E1 communication chain, giving the link-integrity monitoring that railway, pipeline and mine dedicated E1 networks need for their safety-critical communication links.
Power-Loss E1 Bypass PassthroughBuilt-in E1 bypass keeps the protected E1 link passing through and working normally even if the device itself loses power — a fault-tolerant design that protects communication continuity.
Lossy / Lossless Switching Mode SelectableLossy and lossless switching, together with manual and automatic protection modes, are all selectable — so switchover behavior can be matched to how much transient interruption a given E1 service can tolerate.
Dual-Power "1+1" Hot Backup for Continuous E1 ProtectionBuilt-in dual power supplies run in online "1+1" hot-backup mode, DC48V or AC220V selectable, so a single power-input failure does not interrupt the protected E1 channel.
Not a good fit if:
- Only 2 standard E1 primary/backup channels plus 1 E1 important-link interface per chassis — not intended as a high-density multi-circuit E1 aggregation device.
- IP40 metal enclosure only — needs a rack cabinet or additional protection for direct outdoor rain/dust exposure.
- Rated operating temperature is -10°C to 60°C only — no extended/wide-temperature variant is listed for this series, so it is not suited to unheated sub-zero outdoor sites.
Key Features
- Standard 19-inch 1U rack-mount design — easy installation, minimal rack space
- 2 × standard E1 primary/backup channel interfaces + 1 × E1 important-link interface
- Lossy/lossless switching · manual/automatic protection modes selectable
- Chip-level E1 link switching · switching time ≤ 1ms
- LOS/LOF/AIS/bit-error-threshold multi-dimensional alarms covering the full E1 communication chain
- Designed to power-utility protection channel standards
- E1 bypass — link stays active even when the device loses power
- E1 data loopback for line-fault diagnosis and maintenance
- Dual-power "1+1" online hot backup — DC48V or AC220V selectable
- ZJPManager platform integration · in-band/out-of-band management channels
Specifications
Standards & Compliance
| ITU-T G.823-93 | Jitter and wander control based on the 2048kbit/s hierarchy |
| ITU-T G.703-91 | Physical/electrical characteristics of hierarchical digital interfaces |
| ITU-T G.704 | 2048kbit/s synchronous frame structure |
| Power-Utility Protection Standard | Designed to power-utility protection channel standards |
Technical Specifications
| Interface | Complies with ITU-T G.703, G.704, G.823 recommendations |
| Bit Rate | 2048kbit/s ± 50ppm |
| Line Code | HDB3 |
| Impedance | 75Ω unbalanced (120Ω balanced) |
| System Delay | ≤ 30ms |
| Frame Structure | Framed, unframed |
| Switching Mode | Lossy, lossless |
| Switching Decision Metrics | LOS, LOF, AIS, RAI and other alarms, bit errors |
| Two-Path Delay Difference | ≤ 30ms |
| Power-Loss Protection | E1 bypass |
| Network Management Mode | In-band (E1), out-of-band (TCP/IP) |
Power
| Power Input | -48V DC (-36V ~ -72V) or AC220V |
| Power Consumption | ≤ 10 W |
Environment
| Operating Humidity | ≤ 95% (at 25°C) |
| Operating Temperature | -10°C ~ 60°C |
Physical
| Housing | IP40 metal enclosure |
| Mounting | 19-inch 1U standard rack-mount |
| Dimensions | 440 (W) × 44 (H) × 311 (D) mm |
Reliability
| MTBF | 320,000 hours |
| Warranty | 5 years |
Models & Ordering
| Model | Product Description | Price |
|---|---|---|
| CPD-100 | 2M protection channel switching device — 2 channels of intelligently switched standard E1, 1 channel of user standard E1; 1×RJ45 out-of-band management port; lossy/lossless and manual/automatic switching modes; E1 bypass for power-loss link protection; 19-inch 1U rack-mount with built-in dual redundant power supplies, DC48V or AC220V selectable. |
This page covers the single CPD-100 model. Power input is field-selectable between -48V DC (-36~-72V) and AC220V; no wide-temperature variant is listed for this series. The requested model is CPD-100.
Dimensions
unit: mm
Your Brand. Factory-Direct Supply.Neutral casing, ready for your logo · Custom port/power options · Small batches welcome.
Custom & OEM →Who uses it, where it goes and how to install it
Written for the CPD-100 from its own specifications: E1 1+1 protection over 2 primary/backup E1 channels, switching time ≤ 1ms, E1 bypass on power loss, dual -48V DC / AC220V power, 19-inch 1U rack.
Who it is for
- Power utilities and substations — Relay-protection and teleprotection circuits carried on 2M (E1) channels, where a primary and a backup route already exist and the switchover must take ≤ 1ms. The datasheet states compliance with the State Grid standard Q/GDW 11637-2016 for 2M protection channel switching devices.
- Railway, pipeline and mine communication operators — Dedicated E1 networks for signalling, SCADA or dispatch voice: LOS, LOF, AIS, RAI and bit-error alarms decide the switchover, and every event is reported to ZJPManager.
- Telecom and SDH/PDH transmission teams — Adds 1+1 path protection in front of a single E1 user port when the transmission equipment itself cannot protect that circuit; HDB3, 2048kbit/s ± 50ppm, framed or unframed, per G.703/G.704/G.823.
- System integrators of utility communication projects — One 1U box per protected circuit, 1 RJ45 out-of-band management port plus in-band management over E1, and power that matches either a -48V DC battery plant or AC220V mains.
Where and how to install
- Rack position — Mount it in a 19-inch rack or communication cabinet, close to the SDH/PDH or multiplexer that terminates the two E1 routes, so the E1 jumpers stay short. It takes 1U and is 311 mm deep, so check the cabinet depth and leave the rear free for cables.
- Impedance and cabling — Match the line type before ordering: 75Ω unbalanced (coax) or 120Ω balanced (twisted pair). Do not mix a 75Ω port and a 120Ω line without a proper balun, and label primary, backup and user cables clearly so they are not swapped during maintenance.
- Two truly separate routes — 1+1 protection only helps if the primary and backup E1 travel on different fibres, cables or transmission paths. Keep the delay difference between the two paths within ≤ 30ms, especially if you plan to use lossless switching.
- Power and grounding — Feed the two built-in supplies from two different sources (for example two DC breakers or two battery strings) so one failure does not take both down. The -48V DC input accepts -36V to -72V and the unit draws ≤ 10 W. Bond the chassis to the rack ground bar with a short earth lead.
- Environment — Indoor equipment room or a climate-controlled cabinet only: operating temperature -10°C to 60°C, humidity ≤ 95% (at 25°C), IP40 metal housing. Do not place it in unheated outdoor boxes that go below -10°C or where water can drip on it.
- Commissioning — Before putting the protected service on it, use the E1 data loopback to check each route, then pull the primary cable once and confirm traffic moves to the backup and the alarm reaches ZJPManager. Record which mode (lossy/lossless, manual/automatic) you left it in.
Link planning: what the CPD-100 needs on site
The CPD-100 sits between two E1 routes and one user E1 port. The rows below are the values to check against your transmission equipment and power plant before ordering.
| CPD-100 | |
|---|---|
| E1 line interfaces | 2 × E1 (primary/backup) + 1 × user E1 |
| Management port | 1 × RJ45 (out-of-band TCP/IP) + in-band E1 |
| Bit rate / line code | 2048kbit/s ± 50ppm · HDB3 |
| Impedance | 75Ω unbalanced / 120Ω balanced |
| Frame structure | Framed, unframed |
| Switching time | ≤ 1ms |
| System delay / two-path delay difference | ≤ 30ms / ≤ 30ms |
| Power input | -48V DC (-36V ~ -72V) or AC220V, dual 1+1 |
| Power consumption | ≤ 10 W |
| Operating temperature / humidity | -10°C ~ 60°C / ≤ 95% (25°C) |
| Housing / mounting | IP40 metal · 19-inch 1U · 440 × 44 × 311 mm |
- Pick lossless switching only when both routes have a stable, similar delay (difference ≤ 30ms); otherwise lossy switching is the simpler choice.
- Pick the -48V DC input in substations and telecom rooms with a battery plant, so the protection channel keeps running during a mains outage.
All values are from the CPD-100 manufacturer datasheet and match our product page.
E1 Protection Switching FAQ — CPD-100
What does the CPD-100 do in a power-utility protection channel?
It gives one 2048 kbit/s E1 link (G.703) 1+1 protection: the unit monitors primary and backup lines and keeps traffic on the channel with better signal quality, deciding on LOS, LOF, AIS and RAI alarms plus bit errors. It is designed to power-utility protection channel standards for critical relay-protection links.
Which switching modes does the CPD-100 support?
Four modes: lossy, lossless, automatic and manual. Lossless switching works when the delay difference between the two paths is within 30 ms, and overall system delay is 30 ms or less. The E1 stream can be framed or unframed, HDB3 line code, 2048 kbit/s ±50 ppm.
What happens if the CPD-100 loses power?
A built-in E1 bypass takes over on power loss, so the E1 line keeps carrying traffic even with the unit unpowered. Power input is -48 V DC (accepting -36 to -72 V) or AC 220 V, and consumption stays at 10 W or less.
How do I monitor the device and E1 line quality remotely?
Network management runs in-band over the E1 channel or out-of-band over TCP/IP. The management system monitors E1 signal quality on both paths and device status, so an operations center sees LOS, LOF, AIS, RAI alarms and bit-error events before deciding on a manual switchover.
Which E1 interfaces and installation options are available?
Interfaces follow ITU-T G.703, G.704 and G.823, with 75-ohm unbalanced or 120-ohm balanced impedance. The IP40 metal chassis is a standard 19-inch 1U unit (440 × 44 × 311 mm), operates from -10 to 60 °C, and is rated 320,000 hours MTBF with a 5-year warranty.
Can the primary and backup E1 routes on the CPD-100 have different lengths or go through different SDH rings?
Yes, that is the normal case, and separate routes are what make 1+1 protection useful. The limit is the two-path delay difference, which must stay within ≤ 30ms; the device's own system delay is ≤ 30ms. Measure or estimate the end-to-end delay of both routes before you choose lossless switching.
What line conditions make the CPD-100 switch from the primary to the backup E1?
The switching decision uses LOS, LOF, AIS, RAI and other alarms plus bit errors against a threshold. In automatic mode it moves to the channel with the better signal quality, with a switching time ≤ 1ms; in manual mode the operator chooses. Alarms are shown by alarm LEDs, an alarm sound and pop-ups in ZJPManager.
Does the CPD-100 work with unframed E1 or only with G.704 framed E1?
Both: the frame structure is listed as framed and unframed, at 2048kbit/s ± 50ppm with HDB3 line code. That covers relay-protection equipment, multiplexers and PCM channels that present a standard G.703 E1. If your equipment uses a non-standard interface, check with us before ordering.
Can I connect one CPD-100 power input to -48V DC and the other to AC220V?
The page lists built-in dual redundant supplies in 1+1 online hot backup, with DC48V or AC220V selectable, but it does not state whether one unit can be ordered with one DC and one AC supply. Tell us your power plant when you order and we will confirm the supply combination. At ≤ 10 W the load on a -48V DC feed is about 0.2 A.
Does the CPD-100 need an external clock source?
No external clock input is listed. The datasheet states that the device uses a high-precision digital phase-locked loop for system synchronisation, and jitter and wander follow ITU-T G.823. Keep the normal clock plan of your transmission network; if your design requires a dedicated clock input, confirm with us before ordering.
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