IBM 3708 Planning And Installation page 81

Network conversion unit
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Local: Direct Connection Using a Host EIA 232C DTE Cable and a 3708 EIA 232C DCE
Cable
8NA Host
3705
PN 6405390
3725
PN 6405391
4300lCA
F
1M
3708 DCE Cable
I
MJ
F
I
Host DTE Cable
4700
3708
8/38
3720
8/36
3710
Notes:
1. The host DTE cable is sometimes called a direct-connect or direct-attach cable.
2. The combined cable length must not exceed 15 meters (50 feet).
3. The host may use special connectors. If you have this configuration, use the
cables that are provided with the host.
4. Ensure that the connector genders are correct.
5. The host system must be configured to provide clocking. The 3708 must be
configured for external clocking. (Choose 00 for the 3708 SNA host definition
option Line Speed.)
For the 3705, this particular configuration is not supported, except by RPQ
number EHOI70.
For the 3720, the NCP gen must have CLOCKING
=
EXTERNAL,
ATTACH
=
DIRECT, and SPEED
=
(the desired line speed, 2400 bps or
greater). The actual line speed is configured by the MOSS. A 3725 Internal
Clock Card ("ICC Card") feature is required for this configuration.
For the 3725, the NCP gen must have CLOCKING
=
EXTERNAL,
ATTACH
=
DIRECT, and SPEED
=
(the desired line speed, 2400 bps or
greater). The actual line speed is determined by jumpers on the 3725 LAB
board. A 3725 Internal Clock Card ("ICC Card") feature is required for this
configuration.
6. Configure the 3708 SNA host definition option Line Type for a direct
connection (LINE TYPE
=
D).
10;.6
3708 Planning and Installation

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