CTC Union FRM220-NMC, User Manual, Page: 122 / 182

Appendix A
120
When the FRM-DATA is ordered with a X.21 interface, the unit comes with a HDB26 male to DB15 Female
adapter cable, 1 meter long. The pin assignment follows the table below.
Abbreviation HDB26
PIN#
DB15
PIN#
X.21
Circuit
FG 1
↔
1 Shield
SG 7
↔
8 Ground
TD(A)
TD(B) 2
11
↔
↔
2
9 Transmit(A)
Transmit(B)
RD(A)
RD(B) 3
21
↔
↔
4
11
Receive(A)
Receive(B)
RTS(A)
RTS(B) 4
13
↔
3
10
Control(A)
Control(B)
DCD(A)
DCD(B) 8
26
↔
5
12
Indication(A)
Indication(B)
ETC(A)
ETC(B) 24
16
↔
↔
7
14
Ext. Timing(A)
Ext. Timing(B)
RC(A)
RC(B) 17
25
↔
↔
6
13
Signal Timing(A)
Signal Timing(B)
Table 2-6 FRM-DATA X.21 cable
When the FRM-DATA is ordered with a RS-232 interface, the unit comes with a HDB26 male to DB25 Female
adapter cable, 1 meter long. The pin assignment follows the table below.
Abbreviation HDB26
PIN#
DB25
PIN#
RS-232
Circuit
FG 1
↔
1 Frame
SG 7
↔
7 SG
TD 2
Å
2 TD
RD 3
Æ
3 RD
RTS 4 RTS
CTS 5 5 CTS
DSR 6 6 DSR
DTR 20
↔
20 DTR
DCD 8 8 DCD
ETC 24 24 ETC
TC 15 15 TC
RC 17 17 RC
Table 2-7 FRM-DATA RS-232 cable
The FRM-DATA is a media converter for V.35, RS-232, RS-530, X.21 or RS-449 high-speed synchronous or
low-speed synchronous and asynchronous data transmission over optical fiber media. All media converters are
available with either multi-mode or single-mode optical transceiver and with connectors for SC, ST, or FC. In single
mode, WDM (Wave Division Multiplexing with SC connector) is also available in 20 or 40KM reach, which will
provide the ability to transmit and receive data using only a single optical fiber. A unique feature of the FRM-Data
converter is the use of a common PCB card which may either be used as a standalone converter (FMC series) or
placed in the FRM220 rack.
Technical Specifications
Ports 1 port V.35/RS232/RS530/X.21/RS449
Connector HDB26F (adapter cable to DB15, 25, 37 or MB34)
Line Code NRZ
Data rate n x 64Kbps where n=1 to 32 (64 ~ 2048Kbps),
Low Speed Synchronous & Asynchronous
75 ~ 115.2k baud rate
Clock modes Transparent, Recovery, External, Internal
RC, TC, ETC normal or inverted
Control Signals CTS constantly ON or follows RTS