Cable modem channel and signal strength help
Hi Experts!
I got 2 Comcast cable modems (SMC D3G) sharing a single coax line that's coming into the building. Each modem has its own customer account with Comcast.
1st modem: 20Mbps/5Mbps (is installed by Comcast tech)
2nd modem: 50Mbps/10Mbps (was installed by Comcast tech, but I moved it to another part of the building - 400ft run with RG11)
Both modems are working, but are not stable. When I only had 1 modem used at a time, no problems, but now they crash once every few days. Restarting the modem brings the connection back up.
I'm suspecting that the two modems may be interfering with each other, or the 2nd modem has improper signal strengh. I've noticed that both modems have the same Channel ID: 5 Is this a problem?
Is this modem status output helpful?
Modem Number 1:
Downstream Channel
Downstream Frequency 717.000000 MHz 723.000000 MHz 729.000000 MHz 735.000000 MHz
Lock Status Locked Locked Locked Locked
Modulation 256 QAM 256 QAM 256 QAM 256 QAM
Symbol Rate 5.360537Msym/sec 5.360537Msym/sec 5.360537Msym/sec 5.360537Msym/sec
Downstream Power 2.663050 dBmV 3.001565 dBmV 2.982143 dBmV 2.973500 dBmV
SNR 36.844463 dB 37.092701 dB 37.092701 dB 37.355988 dB
Upstream Channel
Upstream Frequency 30599659 Hz
Lock Status Locked Not locked Not locked Not locked
Modulation 64QAM
Symbol Rate 5120 KSym/sec
Upstream Power 54.0000 dBmV
Channel ID 5
Thanks in advance!
I got 2 Comcast cable modems (SMC D3G) sharing a single coax line that's coming into the building. Each modem has its own customer account with Comcast.
1st modem: 20Mbps/5Mbps (is installed by Comcast tech)
2nd modem: 50Mbps/10Mbps (was installed by Comcast tech, but I moved it to another part of the building - 400ft run with RG11)
Both modems are working, but are not stable. When I only had 1 modem used at a time, no problems, but now they crash once every few days. Restarting the modem brings the connection back up.
I'm suspecting that the two modems may be interfering with each other, or the 2nd modem has improper signal strengh. I've noticed that both modems have the same Channel ID: 5 Is this a problem?
Is this modem status output helpful?
Modem Number 1:
Downstream Channel
Downstream Frequency 717.000000 MHz 723.000000 MHz 729.000000 MHz 735.000000 MHz
Lock Status Locked Locked Locked Locked
Modulation 256 QAM 256 QAM 256 QAM 256 QAM
Symbol Rate 5.360537Msym/sec 5.360537Msym/sec 5.360537Msym/sec 5.360537Msym/sec
Downstream Power 2.663050 dBmV 3.001565 dBmV 2.982143 dBmV 2.973500 dBmV
SNR 36.844463 dB 37.092701 dB 37.092701 dB 37.355988 dB
Upstream Channel
Upstream Frequency 30599659 Hz
Lock Status Locked Not locked Not locked Not locked
Modulation 64QAM
Symbol Rate 5120 KSym/sec
Upstream Power 54.0000 dBmV
Channel ID 5
Thanks in advance!
MODEM Number 2 (400ft away):
Downstream Channel
Downstream Frequency 717.000000 MHz 723.000000 MHz 729.000000 MHz 735.000000 MHz
Lock Status Locked Locked Locked Locked
Modulation 256 QAM 256 QAM 256 QAM 256 QAM
Symbol Rate 5.360537Msym/sec 5.360537Msym/sec 5.360537Msym/sec 5.360537Msym/sec
Downstream Power 5.529790 dBmV 5.396259 dBmV 5.335433 dBmV 5.210467 dBmV
SNR 37.092701 dB 37.355988 dB 37.355988 dB 37.355988 dB
Upstream Channel
Upstream Frequency 30599440 Hz
Lock Status Locked Not locked Not locked Not locked
Modulation 64QAM
Symbol Rate 5120 KSym/sec
Upstream Power 39.7500 dBmV
Channel ID 5
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