COMSPHERE 3900 Series Modems
G-8
September 1998
3910-A2-GN32-40
Configuration Options
3920 A
Use Sync Leased (Answer) default configuration options with the following
exception:
Rate at 19.2K
Set ports 1, 2, 3, and 4 to 4800.
3920 B
Use Sync Leased (Originate) default configuration options with the following
exceptions:
TX Clock Source
Set to RXC_Loop.
Rate at 19.2K
Set ports 1, 2, 3, and 4 to 4800.
Port TXC Source
Set port 4 to External.
3910 A
Use TMp (Control) default configuration options with the following exceptions:
TX Clock Source
Set to External.
LeasedLine Rate
Set to 4800(TMp).
3910 B
Use TMp (Trib) default configuration options with the following exceptions:
TX Clock Source
Set to RXC_Loop.
LeasedLine Rate
Set to 4800(TMp).
3910 C
Use TMp (Trib) default configuration options with the following exceptions:
TX Clock Source
Set to RXC_Loop.
LeasedLine Rate
Set to 4800(TMp).
Cables
Cable 1
Use a standard, customer-supplied, EIA-232-D/V.24 cable with a DB-25-P (plug)
connector at one end to attach to the modem. Attach this to the connector labeled
DTE1, 2, 3, or 4.
Cable 2
Use part number 125-0053-1431 (an 8-position, 8-wire modular cord that is
supplied with the modem). Attach this to the connector labeled LEASED.
Cable 5
Use part number 818-2759-0111 or an equivalent customer-supplied,
EIA-232-D/V.24 crossover cable with DB-25-P (plug) connectors on both ends to
attach to the modems. (See Appendix C for pin assignments.)
