ADTRAN T1 CSU ACE - Manual (Page 7)

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7. The following information may be required when applying to
the local telephone company for a dial-up line for the V.34
modem:
8. The REN is useful in determining the quantity of devices you
may connect to your telephone line and still have all of those
devices ring when your number is called. In most areas, the
sum of the RENs of all devices should not exceed five. To be
certain of the number of devices you may connect to your line
as determined by the REN, call your telephone company to
determine the maximum REN for your calling area.
9. This equipment may not be used on coin service provided by
the telephone company. Connection to party lines is subject to
state tariffs. Contact your state public utility commission or
corporation commission for information.
Service Type REN/SOC FIC USOC
1.544 Mbps - SF 6.0F 04DU9-BN RJ48C
1.544 Mbps - SF and
B8ZS
6.0F 04DU9-DN RJ48C
1.544 Mbps - ESF 6.0F 04DU9-1KN RJ48C
1.544 Mbps - ESF and
B8ZS
6.0F 04DU9-1SN RJ48C