AT&T MERLIN LEGEND Release 3.1 System Planning Manual page 257

Customer Support Information
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The facility interface code (FIC) and service order code (SOC):
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— The quantities and USOC numbers of the jacks required.
— For each jack, the sequence in which lines are to be connected, the
line types, the FIC, and the REN by position when applicable.
Ringer Equivalence Number (REN). The REN is used to determine the
number of devices that may be connected to the telephone line.
Excessive RENs on the line may result in the devices not ringing in
response to an incoming call. In most, but not all, areas the sum of the
RENs should not exceed five (5.0). To be certain of the number of
devices that may be connected to the line, as determined by the total
RENs, contact the local telephone company to determine the maximum
REN for the calling area.
Disconnection. You must also notify your local telephone company if
and when this equipment is permanently disconnected from the line(s).
If there are no directly terminated trunks, or if the only directly
terminated facilities are personal lines, report the number
AS5USA-65646-PF-E.
The REN (Ringer Equivalence Number) for all three systems is
1.5A.
For tie line connection, the FIC is TL31M and the SOC is 9.0F.
For connection to off-premises stations, the FIC is OL13C and the
SOC is 9.0F.
For equipment to be connected to DID facilities, the FIC is
02RV2-T and the SOC is AS.2.
For equipment to be connected to 1.544-Mbps digital service, the
SOC is 6.0P and the FIC is:
04DU9-BN for D4 framing format with AMI zero code
suppression.
04DU9-DN for D4 framing format with bipolar 8 zero code
suppression (B8ZS).
04DU9-IKN for extended superframe format (ESF) with
AMI zero code suppression.
04DU9-ISN with ESF and B8ZS.
For equipment to be connected to 56-Kbps or 64-Kbps digital
facilities, the FIC is 02B1Q.
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System Planning