Black Box 5000 manual Sync Channel Characteristics Used for Each Sync Protocol, Dlc

performed after changing the port configuration to sync. Leave the menu and perform the reset, and try this procedure again.

The CHANNEL CHARACTERISTICS menu will appear. This menu differs depending on the sync protocol selected during port configuration. Table 9-2, below, lists each sync protocol and their channel characteristic options. The numbers in the Table 9-2correspond to the menu option for that particular protocol. For example, the third item on the CHANNEL CHARACTERISTICS menu for ASCII Bisync is Maximum Transmit Block Size; for Fast Packet it is DSR Control.

Table 9-3, Sync Channel Characteristics, describes each of the sync channel characteristics and gives default values used for each of the sync protocols. Three of the sync channel characteristics—data

CHAPTER 9: Data-Channel Configuration

rate, channel clocking, and interface type— reference other tables in this chapter. These tables are located immediately after Table 9-3.

CONTROL SIGNALS

A synchronous channel supports four control-signal pairs necessary to support both direct-connected and modem applications: DTR/DSR, BO/RI, RTS/CD and Pin 11/CTS. The first two pairs (DTR/DSR and BO/RI) are passed end-to-end in the Multiserver network, and their levels are set by the attached devices. The last two (RTS/CD and Pin 11/CTS) are interpreted and generated locally by the Multiserver. The particular operation of these signals depends upon the protocol selected, the interface type, and the carrier mode configured by the operator.

Table 9-2. Sync Channel Characteristics Used for Each Sync Protocol

		ASCII Bisync
		EBCDIC Bisync
		H-P Sync
	DLC	RTS/CTS	Sync-Pad	MICOM DLC	MICOM Voice	Fast Packet	TDM
Data Rate	1	1	1	1	1	1	1
Channel Clocking	2	2	2	2	2		2
Maximum Transmit Block Size	3	3	3		3
Maximum Receive Block Size	4	4	4		4
Interface Type	5	5	5	3	5		3
Carrier Mode	6	6	6	4	6
Sync Character		7	7, 8*			2	4
Number of Leading Syncs		8	9
Pad Character		9	10
Number of Leading Pad Characters		10	11
Number of Trailing Pad Characters		11	12
Buffer Control	9	12	13	5	7
Encoding	7
Idle Fill	8
Clock Flow Control	10	13	14	6	8
DSR Control	11	14	15	7	9	3	5
Priority	12	15	16	8	10	4

*Option 7 is Sync Character 1; Option 8 is Sync Character 2.

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