SB5101E sent request DHCPD haven't send offer

[Jasmin Korajlic]

i have problem with Motorola SB5101E cable modem. i am trying to force this
modem to work with isc dhcp and Terayon BW3200 CMTS, but rught now i am
nowhere.  With this combination i have  several other models of cable modem
that works perfectly (SB5100E, Terayon TJ720, TJ721, arris...) . Problem is
:
cable modem nocks on dhcpd, dhcp do offer but modem doesn't receive anything
(ip address, conf file...).
There is modem log:
1970-01-01 00:25:393-CriticalD001.0DHCP FAILED - Discover sent, no offer
received1970-01-01 00:22:223-CriticalR002.0 No Ranging Response received -
T3 time-out1970-01-01 00:22:193-CriticalT001.0SYNC Timing Synchronization
failure - Failed to acquire QAM/QPSK symbol timing 1970-01-01 00:22:18
3-CriticalT002.0SYNC Timing Synchronization failure - Failed to acquire FEC
framing1970-01-01 00:22:18 3-CriticalT001.0SYNC Timing Synchronization
failure - Failed to acquire QAM/QPSK symbol timing1970-01-01 00:22:03
3-CriticalD001.0DHCP FAILED - Discover sent, no offer received 1970-01-01
00:18:533-CriticalR002.0No Ranging Response received - T3 time-out1970-01-01
00:18:493-CriticalT001.0 SYNC Timing Synchronization failure - Failed to
acquire QAM/QPSK symbol timingThere is my dhcp config file:
server-identifier xxx.xxx.xxx.xxx;

ddns-update-style none;
ddns-updates off;

shared-network test
{
    option subnet-mask 255.255.255.0;
    default-lease-time 200000;
    max-lease-time 200000;
    subnet xxx.xxx.xxx.xxx netmask 255.255.255.0
    {
        option broadcast-address xxx.xxx.xxx.xxx;
        option routers xxx.xxx.xxx.xxx;
    }
}
log-facility local3;

authoritative;

default-lease-time         14400;    # 4 hours
max-lease-time             14400;    # 8 hours 30 minutes

option domain-name         "test.com";
option domain-name-servers     xxx.xxx.xxxx.xx, xxx.xxx.xxx.xxx;
next-server xxx.xxx.xxx.xxx;
option time-servers de.pool.ntp.org;

shared-network ttt
{
    option domain-name "test.com";
    authoritative;

    # SUBNET CM
    subnet 192.168.xxx.xxx netmask 255.255.248.0
    {
        #authoritative;
        option routers 192.168.xxx.xxx;
        #range 192.168.xxx.xxx 192.168.xxx.xxx;
        option broadcast-address 192.168.xxx.xxx;
    }

    # SUBNET CPE
    subnet 192.168.yyy.yyy netmask 255.255.248.0
    {
        option routers 192.168.yyy.yyy;
        #range 192.168.yyy.yyy 192.168.yyy.yyy;
        option broadcast-address 192.168.yyy.yyy;
    }
}




host modem-new1 { hardware ethernet 00:11:8D:6E:93:66; filename "
512K512K.cfg"; fixed-address 192.168.xxx.xxx; }
host eth-new1 { hardware ethernet 00:E0:6f:6E:93:67; fixed-address
192.168.xxx.xxx; }

host modem-cm { hardware ethernet 00:E0:6F:E4:BB:28; filename "1M256K.cfg ";
fixed-address 192.168.xxx.xxx; }
host eth-cpe { hardware ethernet 00:E0:6F:E4:BB:29; fixed-address
192.168.xxx.xxx; }

I appreciate any insight you all can give!