Term
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Definition
| Direct Current Signalling - Simple Signalling. transition states indicated by toggling on or off the flow of DC. |
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Term
| DC Signalling > Subscriber Loop |
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Definition
Simple form of DC signalling between the subscriber, and end office.
Same pair of wires is used to provide the voice AND signalling
Off-hook = -48V
On-hook = circuit broken |
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Term
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Definition
| recEive and transMit (makes no fucking sense) - trunking arrangement uses form of DC signalling to indicate state changes on trunks. Two "leads" one called E and the other M are dedicated to signalling. |
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Term
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Definition
Uses tones in place of DC transmitted over the same facility as voice 0 - 4kHz.
Single-Freq; Multi-Freq; Dual-Tone Multi-Freq |
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Term
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Definition
| Multi-Frequency - Used by interoffice trunks. |
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Term
| In-Band Signalling > DTMF |
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Definition
| Dual-Tone Multi-Frequency - two tones per button press |
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Term
| In-Band Signalling > Single Freq |
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Definition
On-hook (idle) or
Off-Hook (busy)
When on hook 2600 Hz freq sent over circuit, notifying of disconnect |
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Term
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Definition
| Simplest, and least intelligent. Most common. Creation of loop "starts" call. Closure terminates. NOT common in PBXs |
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Term
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Definition
| Common in Loop-start - When people on either end of loop seize line at the same time, they're connected unknowingly. |
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Term
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Definition
| Preferred signalling method for PBXs |
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Term
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Definition
| Channel Associated Signalling - Carry signalling information from the trunk in the trunk itself. CCS used more for efficiency |
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Term
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Definition
| Common Channel Signalling - Common link to carry signalling info for a number of trunks. Cheaper, faster, and more flexible. First gen, SS6, second SS7 |
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Term
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Definition
Signalling and Voice are separated
Voice over 2 or 4-wire circuits
Types I, II, III, IV, and V |
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Term
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Definition
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Term
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Definition
North American T1, or
European E1 |
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Term
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Definition
Bell System MF
CCITT No. 5
R1
R2 |
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Term
| CAS > Digital > Bell System MF |
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Definition
in-band MF for address signalling.
For supervision it uses Single Freq |
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Term
| CAS > Digital > CCIT No. 5 |
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Definition
| designed for analog trunks, uses different MF signals for supervision and address signalling. In-band detection used to detect and interpret the MF signals |
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Term
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Definition
Supervision Signals-
Address Signals - MF
Tones and Announcements - ringing, busy, no longer in svc |
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Term
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Definition
| Used to send and receive address signals and play announcements. |
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Term
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Definition
| Integrated Services Digital Network - compatible with SS7. Single access to multiple services. |
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Term
| ISDN > functions and capabilities |
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Definition
2 access methods: BRI and PRI
PSTN access: DID, DOD
800
Foreign Exchange; FX
separate channels for signalling
circuit and packet based communications
creation of VPNs |
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Term
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Definition
B Channel - 64kkbps - user info streams. No signalling
D Channel - Signalling for circuit switch. |
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Term
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Definition
BRI - Basic Rate Interface
PRI - Primary Rate Interface |
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Term
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Definition
Basic Rate Interface - two bi-directional 64 kbps B channels, and one bi-directional 16kbps D channel over standard two wire telephone lines.
Not used much any more - replaced by DSL or cable |
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Term
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Definition
Primary Rate Interface - Corresponds to two primary rates:
1.544Mbps (T1)
2.048Mbps (E1)
Medium to large businesses
B channels, and one 64kbps D channel
T1 = 23B + D
E1 = 30B + D |
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Term
| ISDN > L2 and L3 Protocols > DSS1 |
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Definition
| Digital Subscriber Signalling System No. 1 |
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Term
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Definition
| Q.920/921 - LAPD Link Access Procedures on the D-channel. Reliable transfer of frames between local exchange and TE |
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Term
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Definition
| Q.930/931 - messages for call setup, supervision, teardown, and supplementary services |
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Term
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Definition
| peer-to-peer signalling system - communication between PBXs. Inter-vendor shit, i don't know... lots of other functions of call setup, teardown, etc... |
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Term
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Definition
Same as ISDN at L1 and L2
L3 it splits into 3 sublayers |
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Term
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Definition
QSIG BC - symmetrical, user and network
QSIG GF - control for additional svcs
QSIG Supplementary - ANF protocols, individual or specific svcs and features |
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