mb@sparrms.ists.ca (Mike Bell) (01/16/91)
There are several postings about set-ups for Telebit Trailblazers which needed to dial out and accept calls at several speeds, or are not achieving the desired througput. This will hopefully help. This is the set up we use for a Telebit Trailblazer Plus, Sun OS4.1 using outgoing PEP connections (U19200/tbfuucp) and vanilla 1200 baud connections (S19200/tb1200m) On a 100K compressed tar file, the PEP set up gives somewhere between 1119 and 1380 bytes/sec. (If compression is enabled on the modem, this drops to O(940 bytes/sec). This is on a phone call via a PBX to an adjacent exchange. We use RTS/CTS flow control on the modem - otherwise we encounter character loss on low speed links (eg. 2400 with MNP). The modem interface speed is locked at 19200 - the maximum it supports. We only dial out when using PEP - so its safe for us to leave compression on Auto. It may be preferable to disable it (S110=0) if you have incoming uucp news links. Share and Enjoy! -- Mike -- <mb@sparrms.ists.ca> --- Devices File ---- # Setups for Telebit Trailblazer # ACU cua0 - S19200 tb1200m \D ACU cua0 - F19200 tbfastm \D ACU cua0 - U19200 tbfuucp \D Direct cua0 - 19200 direct --- Dialers File ---- # Telebit TrailBlazer # # By default, the modem is set up with # PEP tones last (S92=1) when answering # Interface speed locked at 19200 (S51=5) # Auto speed determination (S50=0) # Auto-reliable (MNP) (S95=2) for low speed modes # Auto-protocol support (S111=255) # Auto-compression for PEP (S110=255) # RTS/CTS flow control (S58=2, S68=2) # # These mean dial-ins should negotiate a decent protocol # These parameters are modified by the Spar tb1200m, tbfastm, tbfuucp # sequences as appropriate # # 1200 baud "vanilla-flavour" connection - no MNP tb1200m =W-, "" \dATE1V1X1Q0S2=255S12=255S50=2S95=0\r\c OK\r \EATDT\T\r\c CONNECT\s1200 STTY=crtscts # # Local version - we fix the interface speed to 19200 rather than auto-select # it every time. This also means we need the flow control. # tbfastm =W-, "" \dATE1V1X1Q0S2=255S12=255S50=255\r\c OK\r \EATDT\T\r\c CONNECT\sFAST STTY=crtscts # # Trailblazer optimised for compressed news feed - compression disabled # and UUCP protocol support selected. Compressing something which is # compressed tends to increase transmission length, rather than reduce it # since the redundancy has already been removed. # tbfuucp =W-, "" \dATE1V1X3Q0S2=255S12=255S50=255S110=0S111=30\r\c OK\r \EATDT\T\r\c CONNECT\sFAST/UUCP STTY=crtscts ---- Telebit Trailblazer Plus Modem Setup ------ at&n E1 F1 M0 Q6 T V1 X3 Version BA4.00 S00=001 S01=000 S02=043 S03=013 S04=010 S05=008 S06=002 S07=040 S08=002 S09=006 S10=007 S11=070 S12=050 S45=000 S47=004 S48=000 S49=000 S50=000 S51=005 S52=002 S53=001 S54=003 S55=000 S56=017 S57=019 S58=002 S59=000 S60=000 S61=045 S62=003 S63=001 S64=000 S65=000 S66=001 S67=000 S68=002 S90=000 S91=000 S92=001 S95=002 S100=000 S101=000 S102=000 S104=000 S110=255 S111=255 S112=001 S121=000 N0: N1: N2: N3: N4: N5: N6: N7: N8: N9: OK --- gettytab file ----- # @(#)gettytab 1.9 89/09/27 SMI; from UCB 5.7 2/16/86 # # The default gettytab entry, used to set defaults for all other # entries, and in cases where getty is called with no table name # default:\ :ap:lm=\r\n%h login\72 :sp#9600: # Special entry for Telebit Trailblazer @19200 using RTS/CTS flow control # and timeout of a mere 5 secs telebit:\ :sp#19200:ms=crtscts:to#5: ---- ttytab entry ---- ttya "/usr/etc/getty telebit" dialup on remote cua0 "/usr/etc/getty std.19200: unknown off remote -- -- Mike Bell -- <mb@sparrms.ists.ca>