9-8 Smart Switch 1800 4. 0 User Guide , Rev 0 1
Physical Port Interface
must be configured as follows. For reference, port locations are shown on pa ge 6-1.
●Port 0 is always RS-232.
●Port 1 is RS-232 or DSU, depending on whether the optional CSU/DSU card is
installed.
●Ports 2 and 3 are determined by the attached cables: RS-232, V.35, or RS-449.
Blocked Po rt Flag
will cause the port to be enabled (N) or disabled (Y) at node IPL. The port will remain
in that state until this parameter is changed or an on-line enable ([B], [B], [C] from the
Main Menu ) or d i sab le ([B ], [B], [A] from the Main Menu) is perf or med .
Line Speed
is the data transmission rate in bits per second, and the clock speed on a serial port
when the port is a physical DCE (i.e., the attached I/O cable is DCE). If this port is a
physical DTE, specify the line speed that matches (as closely as possible) that of the
device connected directly to the port.
Selecting this parameter for an CSU/DSU port will toggle between the two valid
value s of 56K bps and 64K Clear Channel. Selecting this parameter for any other port
type will display a list of ranges. Press the letter corresponding to a range to display
the valid speeds within that range. All possible speeds are:
75 150 300 600 1200
2400 4800 9600 14.4K 19.2K
24K 28.8K 38.4K 48K 56K
64K 72K 112K 128K 168K
192K 224K 256K 280K 320K
336K 384K 392K 448K 504K
512K 560K 576K 616K 640K
672K 704K 728K 768K 784K
832K 840K 896K 952K 960K
1.008M 1.024M 1.064M 1.088M 1.12M
1.152M 1.176M 1.216M 1.232M 1.28M
1.288M 1.344M 1.4M 1.408M 1.456M
1.472M 1.512M 1.536M 1.568M 1.6M
1.624M 1.664M 1.668M 1.728M 1.792M
1.856M 1.92M 1.984M 2.048M
If an RS-232 DCE port is directly connected to the DTE via the standard
Cabletron cable, the maxi mum supported speed is 64K. If long er cabling is
used, the maximum speed is 19.2K. (The EIA standard for RS-232
addresses sp eeds up to 19. 2 K b ps.)
No Data Poll Period
is the time between polls by this TPAD port of its PU (physical unit) wh en the PU has
no data t o send. This par ameter has no re levan ce on an H P A D port .
No Resp Poll Period
is the time betwee n polls by this TPAD p ort of its PU wh en the PU is not responding.
The TPAD will continue to poll at this interval up to the number of tim es specified by
Maximum Retransmissions. This par a meter ha s no rel e vance on an HPAD port .