ISDN NETWORK SUBORDINATE CLOCK GENERATING DEVICE

摘要

PURPOSE:To flexibly connect a given ISDN line to one unit at the user's side without deteriorating various service functions such as data communication and without increasing the cost of hardware. CONSTITUTION:The device extracts clock components from reception signals from basic interfaces 4a-4n and primary group speed interfaces 5a-5n in ISDN lines 2a-2n and 3a-3n, and prepares frame pulses in ISDN lines 6a-6n and 7a-7n. Among the prepared frame pulses, the frame pulse corresponding to the normal ISDN line is selected by a selector 8, and a section 9 generates the network subordinate clocks synchronized with the frame pulse.