Card Type	Modem (asynchronous)
Chip Set	Unidentified
Maximum Data Rate	2400bps
Data Bus	External
Data Modulation Protocol	Unidentified

CONNECTIONS
Function	Label		Function		Label
RS-232/422		CN1		Daughterboard header		P4
DC power		CN2		Daughterboard header		P5
Line out		CN3		Answer mode switch		SW3
Header to main modem board		J4		Loopback test switch		SW4
Header to main modem board		J5
Note: Daughterboard included on VA-2455 models only.

USER CONFIGURABLE SETTINGS
Setting	Label	Position
Carrier receive level set at 0dBm to -35dBm (switched-line)	SWA/1	On
Carrier receive level set at -10dBm to -45dBm (leased-line)	SWA/1	Off
í Phase equalization disabled	SWA/2	Off
Phase equalization enabled	SWA/2	On
í Factory configured - do not alter	SWA/3	N/A
í Factory configured - do not alter	SWA/4	N/A
í Factory configured - do not alter	SWB/1	N/A
í New synchronization pulse generation disabled	SWB/2	Off
New synchronization pulse generation enabled	SWB/2	On
í Modem uses internal clock source	SWB/3	On
Modem uses external clock source	SWB/3	Off
DTR normal	SWB/4	Off
DTR forced high	SWB/4	On

USER CONFIGURABLE SETTINGS (CON’T)
Setting	Label	Position
í Transmit clock separated from receive clock	SWB/5	Off
Receive clock looped through to transmit clock	SWB/5	On
í DSR forced low when modem is in test mode	SWB/6	Off
DSR normal when modem is in test mode	SWB/6	On
í RTS normal	SWB/7	Off
RTS forced high	SWB/7	On
í 50ms delay from carrier signal to raise DCD	SWC/1	On
10ms delay from carrier signal to raise DCD	SWC/1	Off
í 275ms delay from answer tone to RTS disabled	SWC/2	Off
275ms delay from answer tone to RTS enabled	SWC/2	On
í 160ms delay from CTS to RTS	SWC/3	On
7.1ms delay from CTS to RTS	SWC/3	Off
í Local echo disabled	SWC/4	Off
Local echo enabled	SWC/4	On
í 105ms transmit to receive delay enabled	SWC/5	On
105ms transmit to receive delay disabled	SWC/5	Off
í Factory configured - do not alter	SWC/6	N/A
í Modem will pick up the line only when handset is off-hook	SWC/7	Off
Modem will pick up the line only when handset is on-hook	SWC/7	On
í Factory configured - do not alter	JA	N/A
í Factory configured - do not alter	JB	N/A
Modem will disconnect on reversal of line current	JD	Open
Modem will not disconnect on reversal of line current	JD	Closed
í Factory configured - do not alter	JE	Open
í Signal ground not connected to chassis ground	JF	Open
Signal ground connected to chassis ground	JF	Closed
í Factory configured - do not alter	JG	N/A
í Factory configured - do not alter	JH	Open
í Factory configured - do not alter	JI	N/A
í Analog loopback and busy out controls on pins 18 and 25 disabled	JJ	Closed
Analog loopback and busy out controls on pins 18 and 25 enabled	JJ	Open
í Pin 18 or 25 controls busy out only	JK	Open
Pin 18 or 25 controls analog loopback test and busy out	JK	Closed
í Factory configured - do not alter	JL	N/A
í Receive clock follows transmit clock when no carrier signal is present	JM	Open
Receive clock forced high when no carrier signal is present	JM	Closed
í SW3 functions enabled	JP	Closed
SW3 functions disabled	JP	Open
í Factory configured - do not alter	JO	N/A
í Factory configured - do not alter	JQ	N/A

USER CONFIGURABLE SETTINGS (CON’T)
Setting	Label	Position
í CTS normal	JR	Open
CTS follows RTS	JR	Closed
í Auto-answer enabled	JS	Open
Auto-answer disabled	JS	Closed
Signal receive level set at switched-line levels	SW1B/1	On
Signal receive level set at leased-line levels	SW1B/1	Off
í Secondary channel transmission attenuation set to -5dBm	SW1B/2	Off
Secondary channel transmission attenuation set to 0dBm	SW1B/2	On
í Secondary channel local echo disabled	SW1B/3	On
Secondary channel local echo enabled	SW1B/3	Off
í Secondary channel data rate set to 150bps	SW1B/4	On
Secondary channel data rate set to 75bps	SW1B/4	Off
í Analog loopback test and/or busy out controlled by pin 25	W1	Pins 2 & 3 closed
Analog loopback test and/or busy out controlled by pin 18	W1	Pins 1 & 2 closed
Hardware configuration is used	W2	Pins 2 & 3 closed
Factory configuration is used	W2	Pins 1 & 2 closed

LINE TYPE
Setting	JC	JN
Switched line	Closed	Open
2-wire leased line	Closed	Closed
4-wire leased line	Open	Closed

TRANSMISSION LEVEL
Setting	W3
Permissive (-10dBm)	Pins 1 & 2 closed
Leased-line (0dBm)	Pins 2 & 3 closed
Programmable	Open

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
TXD	Red	On	Modem is transmitting data
TXD	Red	Off	Modem is not transmitting data
RXD	Red	On	Modem is receiving data
RXD	Red	Off	Modem is not receiving data
RTS	Red	On	RTS signal is high
RTS	Red	Off	RTS signal is low
CTS	Red	On	CTS signal is high
CTS	Red	Off	CTS signal is low
DSR	Red	On	DSR signal is high
DSR	Red	Off	DSR signal is low
DTR	Red	On	DTR signal is high
DTR	Red	Off	DTR signal is low
RI	Red	Blinking	Phone is ringing
RI	Red	Off	Phone is not ringing
CXR	Red	On	Carrier signal detected
CXR	Red	Off	Carrier signal not detected

MISCELLANEOUS TECHNICAL NOTES

The -S and -P models are permissive and programmable switched line modems, respectively. The -G and -K models are 2-wire and 4-wire leased line modems, respectively. The defaults for the jumpers reflect these differences where applicable.