Board Reversal Polarity Working Mode Feed Current CSRB All the 32 channels support the polarity reversal. The polarity reversal signals are transmitted after the phone is picked up, and the signal reversal is performed after the phone is hung up. 25 mA Huawei HONET UA5000 multi-service access product integrates traditional voice, VoIP, private line, PBX, video, and multimedia services for subscribers. It provides GE, FE, E1, GPON, and EPON network ports for transmitting services upstream. Huawei HONET UA5000 can be used in scenarios such as integrated access, broadband access, and enterprise access. Overview The HUAWEI CSRB board is a 32-channel POTS and ADSL2+ combo service board with a built-in 600-ohm impedance splitter and protection circuit. The broadband services are transmitted to the broadband control board through the broadband bus, and the broadband control board transmits the services upstream to the IP network. The narrowband services are transmitted to the narrowband control board through the HW bus, and the narrowband control board transmits the services upstream to the PSTN network. The HUAWEI CSRB board adopts the external ringing, that is, the unbalanced ringing mode. The broadband and narrowband line capture tests are implemented by the transfer board. The narrowband service supports the loop-line capture test.
