Black Box 5000 manual Sync Protocol Options, Option Description

Multiserver 5000

		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 9-2for
		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.

84