1、e- 33- 37 MIL-S-29354B (MC) SUPERSEDING 27 January 1986 - MIL-S-29354A(MC) 9 July 1975 MILITARY SPECIFICATION SWITCHBOARD, TELEPHONE: SB-3614/TT, AUTOMATIC This specification is approved for use by the U.S. Marine Corps, Department of the Navy, and is available for use by all Departments and Agencie
2、s of the Department of Defense. 1. SCOPE 1.1 This spacificakiun uovers a fanify of teephone switchboards which shall provide semi- and fully-automatic switching of local and distant calls on 2-wire and 2- and 6-wire lines and 2-, 4-, and 6-wire trunks utilizing space division switching matrices. Fac
3、ilities shall. be provided for interfacing with automatic central offices over 4-wire- tone signaling trunks, 2-wire direct current (DC) closure trunks, and 6-wire recEive and transMit (E two switchboards may be combined to operate as a 60-terminal switchboard, or three switchboards may be combined
4、to operate as a 90-terminal switchboard. The switchboard shall be a modular 30-line/trunk, lightweight, ruggedized, reliable, cordless, semi- and fully-automatic electronic equipment. It shall provide for the following: The switchboard system shall consist The switchboard shall be capable of individ
5、ual . (a) A centralized keysender control facility. (b) Automatic features such as precedence, operator queuing for up to 15 terminations, preemption, reentry, call intercept, trunk directory, and trunk hunting as described herein, I (c) An operation interface with any of the following signaling mod
6、es. 3. (i) $-wire tone signaling (2) 2-wire DC loop signaling (3) 6-wire E Answered Party Release (Manual Preempt ion) (e) Call Monitoring (f) Call Initiation including Conferencing and Test Tone (9) T?Kminal Status Indicators (h) One Time Priority Mark 6 Provided by IHSNot for ResaleNo reproduction
7、 or networking permitted without license from IHS-,-,-MIL-S-273546 58 W 7777706 0356480 2 W U k m O P .rl u U -I4 3 P 4 m. - u) Y u m 5 a MI L-C- 2 9 :I 5 4B (MC .-I +I t O ln N N 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-27354B 58 = 77
8、7770b OL5b48L 4 i MI LI-S- 2 9 3 5 4 B (MC ) 1 I U O u0 mu E4 ou UP, 1a 40 2u . m G E - C O Y m U ir( a n n. a - U 5 al 4 d o, U C O wo 5 o .u er, -4 Q YU cal oa u0 ao d m C W al 2 U U al O u) uE u) u0 au, P +I alu) dE m CVI *d I- V)- - m a (Y +I 3 v I- l 8 - * In d 0 +I - c U u)- ynw- 5cwc no00 alm
9、u)u) w O 5 C U C O U a ,A 7 c UI (u lu d e 3s“T oal * u moo II 6 a -t d al m 5 o al a- o NC ? val +I +iy m +I 3 E Lp 5 * rl I U N m 13 N +I 2 E a 5 P I 7 u) d !.u II m L a k (II O 5 LI + VI 4 I +I # u, t- O O rD (Y O O o (Y - $i L, R E e U 3 4 2 4 2 - +I +I C e P r I Provided by IHSNot for ResaleNo
10、reproduction or networking permitted without license from IHS-,-,-n al k .rl F o W ul 4 (d c .rl v) a al U (d fi .rl M 4 k O a k Cu O P c O U *rl v) 3 I Q Q, U (II e ir( P 4 Li O Li O i) 2 71 0, U (II C Lc P Li O u O U U. ib Q Li 4 Li .d Eo Q, al a v- a a e 5 O O O 4 u U ip 4J 3 4 4 Eo C O i. ?i= 4
11、_. C L. O Q, ri ri O L c, C O u Li O Y Q L, Q, CL O 0 al I4 4 O L U C O u Li O U rp Li Q, a O Q Q, ri rl O 4 U C o u bl O LI (II r I-! t 9 o o m ul ul * O O O r( d r) I4 18 I- -. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I MIL-S-2735qB 58 97977
12、06 0156472 9 Tir st dig it O R/P Remaining digits None Route to operators queue Extend, if privileged, as NXX i/ 1-6 7,8 9 xx xx xx Extend to XX Route to operator queue Go to trunk directory table. If calling termination is CB dial pulse, route to operator queue except when XX is to a distant manual
13、 board. DC-to-DC conversionshall be used to derive the necessary operating voltages for all subsystems. 3.3.2 Electrical requirements. Electrical requirements for the switchboard shall be as follows: 3.3.2.1 Terminal subsystem electrical requirements. The terminal subsystem shall provide termination
14、s for the following line and trunk circuits. switchboard shall be selectable to operate as 30 2-wire line/trunk circuits or any combination of 30 line/trunks wherein no more than 18 designated terminations will be 2-wire DC closure trunks, 4-wire tone-signaling trunks, or 6-wire E and regeneration a
15、nd transmission of such signal to the othsr connectedtermination if it is a trunk (9) Sending answer tone to the TTC-38 when an offhook answer 0 condition is detected or call is answered by operator on 3-digit tone burst trunks only. I 3.3.2.1.1.1 Type I PCB in the 2-wire ringdown mode. In the 2-wir
16、e ringdown mode, both the seize and release signals from line/trunks shall be bursts of 20 Hz. An incoming call from a 2-wire ringdown line/trunk shall be initiated by detection of a 20-Hz signal. Release of 2-wire ringdown connections shall also be initiated by detection of a 20-Hz signal from eith
17、er line or trunk in the connection. The 20-Hz release signals shall not be transmitted back to the line or trunk on which a release signal was received, but shall be transmitted to the other terminal in the connection only if such terminal is operating in the trunk mode. After transmission of this r
18、elease, the 2-wire trunk terminal circuitry shall not interpret as a request for service the receipt of a ring signal to this terminal within a predetermined time of 2-1/2 seconds (s). A distinctive tone of interrupted 500 Hz shall be given to a calling party during the wait-in-queue period During t
19、he ring signal interval, a 500-Hz ringback tone shall be sent automatically to the calling party. Ring signal to a called line x shall be 20 Hz in a single sequence, 2 s on, 2 s off, 2 s on. Ring signal to a called ringdown trunk shall be a single burst of 20 Hz for a nominal 2 s. Ringback signal to
20、 a terminal operating in any mode shall be 500 Hz, synchronized to-the on/off sequence of the ring-forward signal. The switchboard shall respond to an incoming 20-Hz trunk seize in 3 different manners. The standard supervision sequence shall return wait-in-operator-queue tone to the incoming trunk s
21、eize. Incoming 21 - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-293548 58 m 999990b 0356495 4 m release shall be detected and the trunk returned to an idle state, The first special supervision sequence shall return dial tone to the incoming
22、 trunk seize. The switchboard shall assign a DTMF receiver to the trunk, collect, process incoming dual-tone signaling and extend calls in normal fashion. The switchboard originating the trunk call shall monitor the first digit (R or P) to check that the originating subscriber does not place a call
23、above allotted precedence. if allotted precedence is exceeded, the originating switchboard shall release the trunk and return error tone to the originating subscriber. Release shall be as in the standard sequence. The second special supervision sequence shall treat incoming trunk calls in the same m
24、anner as the first special supervision sequence. on outgoing calls, the switchboard shall forward seize (20 Hz) to the called switchboard, and provide ring-back tone (RBT) to the calling party. consider the call complete and take no further action in the call processing sequence. respond to an incor
25、ning 20-Hz line seize in two different manners. supervision sequence shall return wait-in-operator-queue tone to the incoming line seize. Incoming release shall be detected and the line returned to the idle state. The special supervision sequence shall return dial tone to the incoming line seize. Th
26、e switchboard shall. assign a DTMF receiver to the line, collect, process, incoming dual-tone signaling and extend calls in -the normal fashion. The switchboard will monitor the first digit dialed (R or P) to check that the subscriber does not place a call above his allotted precedence. If the allot
27、ted precedence is exceeded, the subscriber shall receive error tone. Release will be in the standard fashion. The switchboard, by means of an operator-controlled access to nonvolatile, alterable memory, shall be able to mark 20-Hz trunks as standard or either type of special signalling sequence and
28、20-Hz lines as standard or special. The switchboard shall then Release shall be as in the standard sequence, The switchboard shall The standard i 3.3.2.1.1.2 Type I PCB in the 2-wire CBS mode. In the CBS mode, the seize and release (off-hook and on-hook) signals shall be respectively a DC closure an
29、d a DC open circuit at the users telephone. 1,200-onm loop resistance and 5,000-ohm leakage resistance when terminated in a TA-312 Telephone Set. Ring and ringback signals shall be the same as for a 20-Hz ringdown line. 3.3.2.1.1.3 Type II PCB with 2-wire CB dial pulse OK DTMF line. In the CB type o
30、f .operation, seize and release (off-hook, on-hook) signals are respectively a DC closure and a DC open circuit caused by the users telephone. with a 24-volt direct current (VDC) prime voltage, the CB termination shall recognize 10 milliamperes (mA) or less as a DC open (on-hook) indication and 16 m
31、A or more as a DC closure (off-hook) indication. Supervision and dial pulse terminations signaling shall be recognizable through DC closures and openings as generated by the subscriber. limiting circuitry of the CB termination shall be such that the telephones will derive a minimum of 26 mA for talk
32、ing and signaling current over loops of up to 1-3/8 miles of WD-1 field wire (450 ohm loop including telephone instrument resistance). Diai pulse shall accept the calling subscribers digiting, convert the signaling to The CBS circuit shall function with subscriber loops of The voltage and current 22
33、 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. . -ML-S-Z935YB 5 9999906 0256496 b * c binary information, and make it available to the processor. The processor, when scanning these CB terminals, shall collect all signaling digits, process them, a
34、nd connect up the calling party to the called party, automatically sending to the calling and called party such supervisory tones as are necessary (i.e., ring, ringback, busy, error or wait-in-queue, off-hook warnings). No operator action shall be necessary for completion of CB, dial pulse or DTMF c
35、alls. Ring and ringback signals shall be 2 s on, 2 s off, for 16 s. After a connection has been established, any CB dial pulse or DTMF termination shall be capable of recalling its local operator by momentarily depressing and then releasing the telephone hook switch. If the hook switch is depressed
36、for more than 1.5 s, it shall be considered a release indication and appropriate release action taken. 3.3.2.1.1.4 Type II PCB in the 2-wire CB DTMF line mode. Operation of the tvue II PCB in the 2-wire CB DTMF line mode shall be as _ specified-in 3.3.2.1.1.3 except that detection of incoming signal
37、ing shall be accomplished by use of a separately provided tone-detection circuitry. This circuitry shall convert signaling information to binary form for further processing. 3.3.2.1.1.5 Type III PCB in the 4-wire tone-signaling trunk mode. Terminations shall be provided in the switchboard to enable
38、operation with an automatic central office such as an AN/TTC-38, another switchboard or a DTMF converter over a 4-wire tone-signaling converter trunk. Terminations shall also be provided in the switchboard system to enable operation with an automatic central office such as the AN/TTC-38 and the AN/T
39、TC-39 over a 4-wire, 3-digit tone-burst signaling trunk. Up to 18 converter or tone-burst signaling trunks shall be provided for, two per type III CB. Supervisory tones available to 2-wire calling subscribers shall be available to 4-wire subscribers, using these trunks as access to the switchboard.
40、No operator actions shall be required to complete 4-wire trunk calls if the originating terminations have DTMF signaling capability. 3.3.2.1.1.5.1 Outgoing signaling - tone signaling. On an outgoing call from the switchboard, the switchboard shall forward seize tone, 2250 Hz, to the distant end. The
41、 distant end may be a DTMF converter, an AN/TTC-38, an AN/TTC-25, a switchboard 3082 or another switchboard 3614. The distant end should respond with sz ack, 570 Hz. The switchboard shall detect sz ack for 475 milliseconds (ms), stop seize, and complete the connection from the originating terminal t
42、o the called termination. If the outgoing call is to a DTMF converter, the call shall be connected to converter operators position and ringback returned to the originating subscriber until the converter operator answers the service request. If the distant end is an AN/TTC-38 or another switchboard 3
43、614, the distant end shall return dial tone and prepare to accept address digits from the originating subscriber. calling subscriber (or operator) shall be able to key in the precedence digit, if desired, and the desired address digits. Detection of the first digit by the distant end should stop dia
44、l tone, the remaining digits shall be collected and the call completed in the normal manner. The originating switchboard shall guard against unauthorized precedence by monitoring the calling subscribers Th a 23 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from
45、 IHS-,-,-MIL-S-273548 58 77777060356477 precedence digits (9 or P for connection-to a distant switchboard and R1 or P for a conr.ection to a distant AN/TTC-38). If the calling subscriber requests a precedence when he has none, the originating switchboard shall release the trunk connection ,and retur
46、n error-tone to the calling subscriber. Otherwise, the call shall be normally processed. marking trunks connected to automatic boards for this precedence monitoring function. If the calling subscriber terminates the call by going on-hook, the switchboard shall send release tone, 2600 Hz, to the dist
47、ant end. The distant end should respond to detection of release by returning rl ack, 570 Hz. The switchboard shall detect rl ack for a nominal 475 mc, stop release, and return the trunk to idle. The operator shall be provided with a capability of 3,3,2.1.1,5.2 Incoming signaling - tone signalin%. Fo
48、r an incoming call from a converter, a switchboard 3614 or an AN/TTC-38 to the switchboard, the signaling sequence is as follows: The distant end sends seize. The switchboard detects seize for 300 to 500 ms and responds with sz ack. The distant end shall detect sz ack and stop transmitting seize. Th
49、e switch-board shall detect the end of seize, stop the sz ack after 475 ms, and then send dial tone. The distant subscriber or operator then may key in digits, causing the switchboard to complete the connection automatically. If the distant end forwards release to the switchboard, the switchboard shall detect release for 525 ms, split the link, continue to detect release, for a total of 900 to 950 ms and then respo
