Black Box 5000 - Manual (Page 86)

Multiserver 5000
84
Table 9-1. Sync Protocol Options
Option Description
1. DLC Typical DLC protocols are SDLC and HDLC. The DLC protocol options are standard bit-
oriented protocols, which use Hex 7E as a block separator or idle fill, and a standard CCITT
polynomial for frame-check-sequence calculations. See information on Idle Fill in Table 9-2 for
specifics on AS/400
® operation or IBM ® 3270 SDLC half-duplex operations with an IBM 3275.
2. ASCII Bisync This is a half-duplex protocol that transmits data in one direction only. It uses whole bytes to
relay information. It sends a frame and waits for acknowledgement. Used with the following
considerations: a 7-bit ASCII code with parity, with either one or two bytes longitudinal
redundancy check (LRC) or a block check character (BCC), and a minimum of two pad
characters following each transmission having the value of FF (hexadecimal).
3. EBCDIC Bisync This protocol is used with IBM 3270, 2780, and 3780 protocols. Fast Packet mode of operation
is automatically supported. Each new block must have at least two SYNC characters. The
default maximum block size is 512 bytes.
4. H-P Sync Hewlett-Packard host-to-host sync data-transfer protocol that runs a modified form of ASCII
Bisync.
5. RTS/CTS This protocol is selected for half-duplex customized or non-standard control sequences. It will
not perform simultaneous input and output (full duplex). Data is passed through the system
according to proprietary algorithms. Transmission is independent of the line protocol and may
be used with any 8-bit synchronous protocol. It is imperative that carrier mode be set to
variable for this protocol (the default).
6. Sync-Pad Select for customized or non-standard control sequences. It can run full duplex or half duplex.
You configure the value and number of pad characters for the end of block.
7. MICOM DLC This protocol is a modified DLC protocol for use when cascading MICOM ® equipment off of the
Multiserver unit. All external multiplexors must have all ports configured for asynchronous
channels.
8. MICOM Voice This protocol is selected when an external Advanced Packetized Voice digitizer with DLC
protocol (APV 1/DLC) is to be used. This protocol is a modified DLC protocol with block size
set to 1024 bytes and a default data rate of 9600 bps. Alternate data rates of 12000 and 14400
are available.
9. Fast Packet Protocol insensitive (transparent) and will compress sync data. Utilizes statistical multiplexing
techniques across the interconnect link like other sync protocols (such as DLC and BISYNC). If
the use of the equipment is at maximum, you may wish to select option 10, TDM, which
reserves bandwidth.
10. TDM Time-Division Multiplexing (TDM) is protocol-insensitive. It is designed for priority devices
which require reserved bandwidth across the interconnect link (dedicated bandwidth). TDM will
not compress sync data.