Appendix B

Cable Specifications


RS-232 WAN Cable Pin Assignments
Connector	Mechanical	Electrical	Interface	Recommended Cable
25-pin D subminiature male pins	ISO 2110	Data Terminal Equipment	EIA RS-232-C, type E	Belden 9937 0.024d per foot 12 pF per foot Wire run list 1 to 1

Connector Pin #	EIA	CCITT V.24/V.28	Description	Signal Direction DTE DCE
1	AA	101	Shield
2	BA	103	Transmit Data	--->
3	BB	104	Receive Data	<---
4	CA	105	Request to Send	--->
5	CB	106	Clear to Send	<---
6	CC	107	Data Set Ready	<---
7	AB	102	Signal Ground
8	CF	109	Data Carrier Detect	<---
15	DB	114	Transmit Clock	<---
17	DD	115	Receive Clock	<---
20	CD	108/2	Data Terminal Ready	--->
22	CE	125	Ring Indicator	<---
24	DA	113	Transmit Timing Clock	--->

V.35 WAN Cable Pin Assignments
Connector	Mechanical	Electrical	Interface	Recommended Cable
Rectangular 34-position male pins	ISO 2593	AT&T PUB 41450 CCITT V.35	CCITT V.35	Belden 9813 0.0649d per foot 15.5 pF per foot Wire run list A to A

Connector Pin #	PUB 41450 Designation	V.24/V.28 Interchange Circuit	Description	Signal Direction DTE DCE
A	AA	101	Shield
B	AB	102	Signal Ground
C	CA	105	Request to Send	--->
D	CB	106	Clear to Send	<---
E	CC	107	Data Set Ready	<---
F	CF	109	Data Carrier Detect	<---
H	CD	108/2	Data Terminal Ready	--->
J	CE	125	Calling Indicator	<---
K		N/C
L		N/C
M		N/C
N		N/C
P	SD(A)	103	Transmit Data A-wire	--->
R	RD(A)	104	Receive Data A-wire	<---
S	SD(B)	103	Transmit Data B-wire	--->
T	RD(B)	104	Receive Data B-wire	<---
U	SCTE(A)	113	Transmitter Signal Element Timing (DTE source) A-wire	--->
V	SCR(A)	115	Receiver Signal Element Timing A-wire	<---
W	SCTE(B)	113	Transmitter Signal Element Timing (DTE Source) B-wire	--->
X	SCR(B)	115	Receiver Signal Element Timing B-wire	<---
Y	SCT(A)	114	Transmitter Signal Element Timing A-wire	<---
Z	-	N/C	-
AA	SCT(B)	114	Transmitter Signal Element Timing B-wire	<---
Twisted Pair Combinations
		Pins P and S
		Pins R and T
		Pins U and W
		Pins V and X
		Pins Y and AA

V.11 WAN Cable Pin Assignments
Connector	Mechanical	Electrical	Interface	Recommended Cable
15-pin D subminiature, male pins	ISO 4903	EIA RS-423/CCITT V.10	CCITT V.11	Belden 9832 0.024d per foot 15.5 pF per foot Wire run list 1to 1

Connector Pin #	CCITT X.24	Description		Signal Direction DTE DCE
1	Shield	Shield
2	T(A)	Transmit		--->
3	C(A)	Control		--->
4	R(A)	Receive		<---
5	I(A)	Indication		<---
6	S(A)	Signal Element Timing	<---
7	N/C
8	G	Signal Ground
9	T(B)	Transmit		--->
10	C(B)	Control		--->
11	R(B)	Receive		<---
12	I(B)	Indication		<---
13	S(B)	Signal Element Timing	<---
14	N/C
15	N/C
Twisted Pair Combinations
		Pins 2 and 9 Pins 3 and 10 Pins 4 and 11 Pins 5 and 12 Pins 6 and 13
Note: The connection at the NTP end of the cable should be fitted with M3 screws.