CANOGA PERKINS 2370 High-Speed Universal Fiber Optic Modem - Manual (Page 19)

EdgeAccess® Universal Chassis System
Chapter 3
Electrical Data Interfaces
The 2370 supports these ELIMs:
 L130 Configurable EIA-232/423/530/P53/449/V35
 P53 Interface for the L130
 L131 EIA-422 DC-37 with controls
 L132 EIA-422 TwinAx
 L133 TTL BNC
 L134 T1 RJ-48
 L135 T1 DA-15
 L136 E1 RJ-48
 L137 E1 DA-15
 L138 EIA-422 DC-37 without controls
 L139 T88
In addition, this chapter describes operating and clock modes for the ELIMs.
3.1 L130: Configurable EIA-232/423/530/P53/449/V35
The L130 ELIM is electrically compatible with the EIA-423A, EIA-232D, and EIA-530 standards.
Table 2 lists the EIA-423/232 and EIA-530 signals with the pinouts for the female DB-25 connector
and the signals and pinouts for the adapters that support EIA 449/422 or V.35.
The control leads comply with the interface standards. RTS, CTS and DCD provide handshaking.
TD and RD are data input and output. SCT is the clock output for Internal and Slave modes. SCR is
always the clock for RD. SCTE is the clock input for External mode. DSR, DCD, and CTS output
are selectable in software.
The EIA-423 and EIA-232 interface includes these five end-to-end control leads:
 RTS to DCD
 DTR to RI
 STD to SRD
 SRTS to SDCD
 DSRS to SCTS
DSR and TM are local status leads that follow the functions described in EIA-232D. DSR typically
indicates that the modem is ready to handle transmit data. TM indicates that a loopback is active on
one or both modems. LL and RL are loopback control inputs and follow the software setting, unless a
2370 in a Model 1040 is in hardware mode and the function switch on the enclosure is set for
loopback, then LL and RL are ignored. For details on the software and loopback tests, see Sections
4.12 and 5.1.
Model 2370 User Manual 3-1