AT&T System 75 Wiring Diagram page 319

CHAPTER 5. AUXILIARY EQUIPMENT INSTALLATION
XE—Implementation (555-200-651) and AT&T System 75 and System 75
XE—Administration (555-200-500).
The connection between the switch and the 212-type modem is the
same as for external ringing (Figure 4-39). When a 212-type modem is
used, a TN758 pooled modem circuit pack must be provided. One of the
pooled modem's conversion resources is dedicated to the SMDR
output device. Administer per AT&T System 75 and System 75
XE—Implementation (555-200-651) and AT&T System 75 and System 75
XE—Administration (555-200-500).
For R1V2 or R1V3 systems only, a TN726 data Line circuit pack may be
used and PDMs, TDMs, or 212-type modems are not required for the
DTE. Connections between the switch and the SMDR output receiving
device is the same as a customer-provided data terminal (Figure 5-24).
Interface Cabling to SMDR Output Device
Figure 5-25 shows the cabling required to connect the TELESEER* unit,
printer, or customer-provided DTE. The M25B cable connects to the P1
connector on the TELESEER unit.
* Trademark of AT&T
5-46