John, Fixed assignment on modems means if a call from the telco comes in on span 1 channel one, it will hit modem 1 in slot one. If you set it to round robin, a call that comes in on span 1, channel 1, might hit modem card 1 channel 15. What you don't have control over is the TELCOs call routing method (of course, you can call them and request a different routing method). YOU can only control MODEM call routing assignments for calls that hit a particular modem. Same principle: Round Robin from the telco gives you equal distribution/usage of all cards. Round Robin set on the DSP will give you even distribution/usage of modems on that card. In the example below, if you have your DSP's set to distribute calls in a fixed assignment fashion, then you can be pretty sure you received calls from the telco on Span 1/Ch 24 Span 1/ch 22 Span 2/ch 24 Span2/Ch 1 Hope that helps... Rick Team Solunet -----Original Message----- From: John R. Aynesworth [mailto:jra@hcsinc.com] Sent: Thursday, March 06, 2003 5:52 PM To: usr-tc@mailman.xmission.com Subject: [USR-TC] Fixed assigment modem routing I'm trying to set up fixed assignment modem routing on a TC1000 running TCS 4.2.73 with two HiPER DSP's running 2.1.9 attached to channelized T1's. I've used both the DSP console level command "set mdmrmeth fixeda" and the TCM method using Configure/Programmed Settings/Card Level/Parameter/Routing Method. A "display mdmrmeth" on each DSP in console mode shows FIXED ASSIGNMENT. Any suggestions? Am I missing something? HiPer>> list ip pool IP ADDRESS POOLS Name Address Size InUse State Route Unused Status tcpool 156.46.203.129/26 48 45 PUBLIC NO_AGGREGATE 0 ACTIVE HiPer>> list ip netwo CONFIGURED NETWORKS Name Prot Interface State Type Network Address hnet IP eth:1 ENA STAT 156.46.108.4/C IP-loopback IP loopback ENA AUTO 127.0.0.1/H ek-ip-I1513 IP slot:2/mod:1 ENA DYN 156.46.203.177/H deb-ip-I1536 IP slot:2/mod:24 ENA DYN 156.46.203.163/H jab-ip-I1278 IP slot:1/mod:22 ENA DYN 156.46.203.145/H jjw-ip-I1280 IP slot:1/mod:24 ENA DYN 156.46.203.129/H