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8-28 PUBLIC AND PRIVATE DATA NETWORK CONNECTIONS
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5. Also, supports 64-kbps 3270C/PC-PBX connections.
6. Older data modules (such as the DTDM, 7404 data module, and 7406 and 7407 data stands), can be
used for Mode 2 connections.
7. Only the System 85 R2V4, the Generic 1, and Generic 2 support ISDN-PRI.
8. The System 85 (R2V3) will not support dedicated data connections.
9. At mode 0, the MPDM and 7500B cannot be used to communicate with each other.
10. The 7500B can only be used with the Generic 2 communications system.
11. If the facility is restricted and the MPDM is used, then the customer’s DTE must not generate an all
ones octet. DTEs that use HDLC satisfy this requirement.
PRIVATE
DATA
NETWORK
D4*
S75/S85
G1/G2
DSUMPDM/M1*
DS1 WITH
ROBBED
BIT
DS1 WITH
ROBBED
BIT
DTEDTE
* DAA-OCU supports signaling for switched applications. OCU-56 is non-signaling for dedicated line applications.
Figure 8-18. Private Data Network with Robbed Bit Facilities and D4 Connection at Far End (Mode 1)
24th
CHANNEL
24th
CHANNEL
DTEDTE
PRIVATE
DATA
NETWORK
S75/S85
G1/G2
S75/S85
G1/G2
DATA
MODULE
DATA
MODULE
Figure 8-19. Private Data Network with 24
th
Channel or ISDN-PRI Signaling (Modes 0, 1, 2, 3)
ISDN-PRI ISDN-PRI
DTEDTE
PRIVATE
DATA
NETWORK
S75/S85
G1/G2
S75/S85
G1/G2
DATA
MODULE
DATA
MODULE
Figure 8-20. Private Data Network with 24
th
Channel or ISDN-PRI Signaling (Modes 0, 1, 2, 3)