8E1 PDH multiplexer adopts a large-scale integrated circuit with independent intellectual property rights. It applies time division multiplexing technology to mix and encode E1 signals and transmit them on a pair of optical fibers. Products with this chip are designed with a single board, with high integration, small size, low power consumption, reliable operation, and easy installation and use. Next, we will introduce the main features and technical parameters of the pdh multiplexer in detail, let’s take a look!
1. Main functions and features
①Provide 8 E1 service ports, all-digital clock recovery, and smooth phase locking technology
Provide RS232 network management interface, support unified network management;
Provide RS485 network management cascade interface, multiple devices can be managed through the same terminal network
②Dual power supply, mutual hot backup, optional AC220V, DC 48V, etc.
③Provide complete local/peer alarm monitoring, three-color indicator light
④Support local/remote E1 tributary loopback
⑤Provide one-way business phone
⑥Provide transparent RS232 data channel, the rate is 300-19.2Kbit/s adaptive
2. Parameters and technical indicators
2.1 Optical interface
①Wavelength: 1310nm (standard model)
②Luminous power: ≥－12dBm
③Receiving sensitivity: ≤-37dBm (BER≤10-11)
④Interface: FC
2.2 E1 interface
①The device has 8 E1 interfaces, in line with G.703 recommendations
②Rate: 2048Kbps ±50ppm
Code type: HDB3
Impedance: 75Ω (unbalanced) or 120Ω (balanced)
Jitter: Comply with G.742 G.823 recommendations
③Input port allowable attenuation: 0～6dB
④E1 connector: DB37
2.3 Ethernet interface
Interface rate: 10/100 adaptive
Interface protocol: IEEE802.3, IEEE802.3U, IEEE802.1d, IEEE802.1Q
Physical interface: RJ45
2.4 RS232 interface
①8E1 PDH optical transceiver provides a 2-way RS232 interface, the interface definition is as follows:
1 channel RS232 for a network management system, the rate is 9600bit/s, DCE mode
1 channel RS232 for users to use, the rate is 300–19.2Kbit/s adaptive, DCE mode
②2-way RS232 shares a DB9 connector
2.5 RS485 interface
①Used for cascade network management can supervise 32 devices at the same time
②Interface mode: 2-way RJ45 interface is used for uplink cascade and downlink cascade respectively
③Rate: 9600bit/s
2.6 Business Phone
①Four-wire handset phone (RJ11 interface)
②Does not occupy the E1 channel
2.7 Power
①The equipment can be powered by dual power supplies and are hot backup for each other.
AC 220V: 220V AC input
DC 48V: 48V DC input
②The power consumption of the whole machine is less than 10W
2.8 Working Environment
①Working temperature: 0～45℃
②Relative humidity: ≤95% (at 25℃)
③Atmospheric pressure: 70～106Kpa
2.9 Dimensions and weight
Dimensions: 438mm (width) × 150mm (depth) × 44mm (height)
