The CM sends a ranging request (RNG-REQ) message to the CMTS and waits for a ranging response (RNG-RSP) message or a T3 timer expiration. If a T3 timeout occurs, the retry count increments. If the retry count is less than the maximum number of retries, the modem transmits another RNG-REQ at a higher power level. This ranging process occurs in the initial maintenance or broadcast regions of the MAP because the CMTS has not assigned the modem a service identifier (SID) for unicast transmissions in the MAP. Thus, broadcast ranging is contention based and subject to collisions. To compensate for this the modems have a ranging backoff algorithm to calculate a random backoff time between RNG-REQ transmissions. This can be configured using cable upstream range-backoff command. When the transmit power has reached a sufficient level for the CMTS, it will respond to the RNG-REQ with a RNG-RSP containing a temporary SID. This SID will be used to identify unicast transmission regions in the MAP for unicast ranging. Taken from Cisco
If a modem cannot proceed out of ranging state, the likely cause is an insufficient transmit power level. In the setup above transmit power can be adjusted by adjusting attenuation at the low frequency port. Increased attenuation will result in increased transmit power levels. Roughly 20 - 30 dB of attenuation is a good place to start. After initial ranging init(r1) the modem proceeds onto init(r2) which is where the modem must configure the transmit timing offset and power level to ensure that transmissions from the modem are received at the correct time and are at an acceptable input power level at the CMTS receiver. This is performed through a conversation of unicast RNG-REQ and RNG-RSP messages. The RNG-RSP messages contain power and timing offset corrections the modem must make. The modem continues to transmit RNG-REQ and perform adjustments per RNG-RSP until the RNG-RSP message indicates ranging success or ranging complete by reaching the init(rc) state. If a modem cannot proceed out of init (r2) the transmit power needs to be refined. Below is an output display of a CM in init(r2) state.
sounds like you need to call your ISP and sign up for service so the could run a line to you.
If a modem cannot proceed out of ranging state, the likely cause is an insufficient transmit power level. In the setup above transmit power can be adjusted by adjusting attenuation at the low frequency port. Increased attenuation will result in increased transmit power levels. Roughly 20 - 30 dB of attenuation is a good place to start. After initial ranging init(r1) the modem proceeds onto init(r2) which is where the modem must configure the transmit timing offset and power level to ensure that transmissions from the modem are received at the correct time and are at an acceptable input power level at the CMTS receiver. This is performed through a conversation of unicast RNG-REQ and RNG-RSP messages. The RNG-RSP messages contain power and timing offset corrections the modem must make. The modem continues to transmit RNG-REQ and perform adjustments per RNG-RSP until the RNG-RSP message indicates ranging success or ranging complete by reaching the init(rc) state. If a modem cannot proceed out of init (r2) the transmit power needs to be refined. Below is an output display of a CM in init(r2) state.
sounds like you need to call your ISP and sign up for service so the could run a line to you.